Cretaceous period

The name Cretaceous is derived from the Latin word "creta", which means chalk. The Cretaceous period started because Pangaea broke up and volcanoes erupted. Beginning about 145 million years ago, this period represented the final chapter in the age of the dinosaurs. Cretaceous Period 65. The Cretaceous Period is one of the major divisions of the geologic timescale, reaching from the end of the Jurassic Period (i. It was the time of gigantic sauropods plowing through forests, and pterosaurs and huge, feathered birds darkening the skies. It is during the Cretaceous that the first ceratopsian and pachycepalosaurid dinosaurs appeared. The Cretaceous is a geologic period and system that spans 79 million years from the end of the Jurassic Period 145 million years ago (mya) to the beginning of Cretaceous Period, in geologic time, the last of the three periods of the Mesozoic Era. Animals, such as the Stegosaurs began to become much more rare. Geologic Map of Missouri, 1990, Missouri Department of Natural Resources, Division of Geology and Land Survey (now Geological Survey and Resource Assessment Division). The Triassic, Jurassic, and Cretaceous periods were marked out by geologists to distinguish among various types of geologic strata (chalk, limestone, etc. This site discusses the physiography, origin, evolution and biologic significance of this intriguing geologic feature. The Cretaceous began 145. The Cretaceous period was first defined by a Belgian geologist named Jean d’Omalius d’Halloy in 1882, using the strata in the Paris Basin and named for the extensive beds of chalk (calcium carbonate deposited by shells of marine invertebrates, principally coccoliths), found in the upper Of all mass extinction events that have ever occurred on Earth, the Great Dying was THE MOST DEVASTATING one but, the Cretaceous-Tertiary extinction event is THE MOST FAMOUS extinction event. 10 Cretaceous Animals That Weren’t Dinosaurs. Cretaceous Period dinosaurs were many and varied. from about 146 to 136 million years ago (Ma)) to the beginning of the Paleocene epoch of the Tertiary Period (about 65. © 1996 - 2019 National Geographic Society. It began 145-65 Million Years Ago, lasting about 80 million years. " Richard Paselk. The Tertiary Period marks the beginning of the Cenozoic Era. The Cretaceous Period is the period of time from about 140 million to 65 million years ago (ages vary). The Cretaceous Period was the last period of the Mesozoic era. During this time, the Earth’s climate changed dramatically. Cretaceous Period (146 to 65 million years ago) Also see: Mesozoic Paleobiology. It is believed to be a cousin of the Aucasaurus, which would make it a two-legged animal. The Cretaceous Period. Free printable dinosaurs from the Cretaceous period to color and use for crafts and other learning activities. 5 million years ago to 65. The Cretaceous is traditionally Prehistoric times. Acrocanthosaurus was a giant carnivore of the Early Cretaceous that was nearly as large asTyrannosaurus which lived at the end of the Cretaceous Period. Cretaceous Dinosaurs The Cretaceous Period for Kids. At the beginning of the Lower Cretaceous in North America, the Mexican Sea of the late Jurassic period spread over Texas, Oklahoma, New Mexico, and parts of Arizona, Kansas, and Colorado. It began 65 million years ago and lasted more than 63 million years, until 1. 5 Cretaceous Period, in geologic time, the last of the three periods of the Mesozoic Era. Cretaceous Europe A map of Europe in Cretaceous times Today, Europe has two main islands—Britain and Ireland. During the Holocene period, the concentration has oscillated from 210 ppmV to 385 ppmV. Get Started The Cretaceous Period (meaning "chalk," from the many chalk deposits of this age [the White Cliffs of Dover, to name one]) easily stands as one of the most popular times among the general populus. But they were also doomed. Rock strata from this epoch form the Upper Cretaceous series. Quaternary Period, Cenozoic Era, Phanerozoic Eon [1. The modern group consists of approximately 15,000 extant species in three distinct groups, but only a handful of species have been described from the Cretaceous of New Jersey. , they are referred to as the Cretaceous System). The Cretaceous Period is known as the "Age of Dinosaurs". Ron Blakey at Northern Arizona University. cretaceous periodThe Cretaceous is a geologic period and system that spans 79 million years from the end of the Jurassic Period 145 million years ago (mya) to the beginning of The Cretaceous Period. The Early Cretaceous Period (hardcover). During this time, many new species evolved. It followed the Jurassic period, and is the latest period of the Mesozoic era. The Cretaceous period derives its name from the Latin word for chalk, creta, a mineral that has been found in extensive beds at this time - such as Crete of course. 3-2-2019 · The Cretaceous period began at the end of the Jurassic period approximately 144 million years ago. The Cretaceous (/ k r ɪ ˈ t eɪ ʃ ə s /, kri-TAY-shəs) is a geologic period and system that spans 79 million years from the end of the Jurassic Period 145 million years ago to the beginning of the Paleogene Period 66 mya. Click on the button for gallery mode . Ginkgo fruit (which is technically a soft squishy layer on the seed, only flowering plants have something that can be called fruit officially) is edible and healthy, but few people want to eat it. The Cretaceous Period, the last part of the Mesozoic Era, extended from 145 to 66 million years ago. Triceratops and Tyrannosaurus Rex were present. The Cretaceous as a separate period was first defined by Belgian geologist Jean d’Omalius d’Halloy in 1822, using strata in the Paris Basin and named for the extensive beds of chalk (calcium carbonate deposited by the shells of marine invertebrates, principally coccoliths), found in the upper Cretaceous of western Europe. Of, relating to, or being the period of geologic time from about 146 to 66 million years ago, the third and most recent period of the Mesozoic Era. About one-third of the earth's present land area was submerged, allowing heat from the sun to be distributed farther poleward by ocean currents and producing a climate in which cold-blooded reptiles existed worldwide. The Cretaceous is traditionally Late Cretaceous Climate. The Cretaceous is usually noted for being the last portion of the "Age of Dinosaurs", but that does not mean that new kinds of dinosaurs The Cretaceous period began at the end of the Jurassic period approximately 144 million years ago. , and Babcock, L. 5 million years ago 1. Many animals we know of today arose during this period. But longevity is only part of the story. ) laid down tens of millions of years ago. 5 7-2-2019 · Cretaceous Period: Cretaceous Period, in geologic time, the last of the three periods of the Mesozoic Era. Fossils of the Cretaceous Period Also see: Mesozoic PaleobiologyThe Cretaceous (/ k r ɪ ˈ t eɪ ʃ ə s /, kri-TAY-shəs) is a geologic period and system that spans 79 million years from the end of the Jurassic Period 145 7-1-2016 · The Cretaceous Period was the last segment of the Mesozoic Era. Lesson 54 - Geologic Features. Earth's magnetic field is 3 times stronger than today. A presentation by btrichey created with Haiku Deck, free presentation software that is simple, beautiful, and fun. During the Cretaceous, reptiles were by far the dominant group, with dinosaurs ruling the land, while other creatures inhabited the skies and the seas. 5 million years ago, and ended 66 million years ago. The Cretaceous Period is the most recent period of the Mesozoic Era, spanning 77 million years, from 142 million to 65 million years ago. Texas Bulk Fossils has many varieties of common to rare fossils for educators, kit manufacturers, and collectors from the beginner to the advanced. Numerous subfamilies, genera, and species quickly appeared on a near-global level, even Antarctica. ) The type specimen of Juramaia, the "Jurassic mother," dates to about 160 million years ago, More Info. It lasted approximately 79 million years, from about 145. ) the interval taken to complete one cycle of a regularly repeating phenomenon The Upper Cretaceous rocks of the British Isles 4 Figure 1. Marks the beginning of the period when major tracts of land are submerged; 4. The impact of a 10 mile wide comet caused global climate changes 26-11-1995 · The Cretaceous is usually noted for being the last portion of the "Age of Dinosaurs", but that does not mean that new kinds of dinosaurs did not appear The Cretaceous (/ k r ɪ ˈ t eɪ ʃ ə s /, kri-TAY-shəs) is a geologic period and system that spans 79 million years from the end of the Jurassic Period 145 7-2-2019 · Cretaceous Period: Cretaceous Period, in geologic time, the last of the three periods of the Mesozoic Era. The Mesozoic Era. Titanosaurs had roots in the Late Jurassic of Tanzania,Many of the most famous dinosaurs, such as Tyrannosaurus and Triceratops, first appeared in the Cretaceous (kruh-TAY-shus) Period, which lasted from 144 to 65 million 18-11-2015 · A presentation by camp3148 created with Haiku Deck, free presentation software that is simple, beautiful, and fun. The Cretaceous period marks the end of the age of The Cretaceous period by Josef Moravec showing Cretaceous dinosaurs Tyrannosaurus rex, Albertosaurus, Corythosaurus, Anatosaurus, Parasaurolophus, Triceratops Climate. See more. This period started about 138 million years ago, and ended 68 million years ago (which ties in with the sentence before it) . It was preceded by the Jurassic and followed by the Paleocene Epoch. The Cretaceous (Latin language for "chalky"), usually abbreviated K for its German translation Kreide (chalk), is a geologic period and system from about 145. The Cretaceous Period (147-66 mya) is one of the major divisions of the geologic timescale, reaching from the end of the Jurassic Period (i. The Cretaceous was a period with a relatively warm climate and high eustatic sea level. , Name an insect that lived during the Cretaceous period , Name an amphibian that lived during the Cretaceous period. Animals that lived during the Cretaceous period, about 145 to 66 million years ago, belong in this category. During the Late Cretaceous the global climate was warmer than today's climate. An 26-11-1995 · The Cretaceous is usually noted for being the last portion of the "Age of Dinosaurs", but that does not mean that new kinds of dinosaurs did not appear The Cretaceous (/ k r ɪ ˈ t eɪ ʃ ə s /, kri-TAY-shəs) is a geologic period and system that spans 79 million years from the end of the Jurassic Period 145 7-2-2019 · Cretaceous Period: Cretaceous Period, in geologic time, the last of the three periods of the Mesozoic Era. e. A 2016 Outstanding Science Trade Book for Students K-12 (National Science Teachers Association-Children's Book The Cretaceous (/ k r ɪ ˈ t eɪ ʃ ə s /, kri-TAY-shəs) is a geologic period and system that spans 79 million years from the end of the Jurassic Period 145 million years ago to the beginning of the Paleogene Period 66 mya. No ice existed at the Poles. At the same time, rifting between North America and Europe began, and Iberia rotated counter-clockwise away from France. N o film has influenced popular understanding of dinosaurs more than Jurassic Park. It began 100. The bull's eye marks the location of the Chicxulub impact site. 6 to 65 million years ago. Huge carnivores like Tyrannosaurus rex and Giganotosaurus appeared, as did Triceratops and many, many others. Chapter 11 - The Cretaceous Period. It is believed most, if not all of the Walker, J. Dinosaurs: troodon, tyrannosaurus Late Cretaceous. No matter what you’re looking for or where you are in the world, our global marketplace of sellers can help you find unique and affordable options. You well might ask how there could be samples of air trapped and preserved for 80 million years. Dinosaurs, pterosaurs, The last surviving group of sauropods were titanosaurs, and their distribution was nearly worldwide. The Upper Cretaceous is the last geological epoch in the Cretaceous. India separated from Madagascar and raced northward on a collision course with Eurasia. "Look after the pennies and the pounds will look after themselves. Silhouettes of dinosaurs of cretaceous period of mesozoic era with names: Abelisaurus, Achelousaurus, Acrocanthosaurus, Anatotitan, Ankylosaurus, Archaeoceratops Explore dinosaurs from the Late Triassic in the Natural History Museum Dino Directory In many languages this period is known as "chalk period". Limestone areas throughout the Indonesian archipelago originate from jurassic, cretaceous, tertiary and quarternary times. The cretaceous Period Was Initiated By The Subsidence Of A Large Area To The South Of The Gulf Of Carpentaria, Whereby A Lower Cretaceous Sea Spread Southward, Across Western Queensland, Western New South Wales And The North-eastern Districts Of South Australia. , Geissman, J. Within the shale unit are several distinct ash layers (bentonites), Could a Modern Day Human Survive the Cretaceous Period? Life, uh, finds a way. 5 4 to 65. Mesozoic Era. Cretaceous Climate. Forests over limestone are usually a mosaic of rich and poor growth due to free-draining, steep slopes, water stress, high concentrations of calcium and magnesium, richer soils between jagged peaks and pinnacles. This unit consists of dark gray/black shales that were deposited in deep marine waters. Whether you're a student, an educator, or a lifelong learner, Vocabulary. What does Cretaceous period mean? Proper usage and pronunciation (in Cretaceous Period: Life. Contents: Geologic time - an overview; Hadean eon: 4,600-3,900 mya - solidification of earth's crust. Most dinosaur species lived and died out during this period The Cretaceous–Tertiary extinction event, now called the Cretaceous–Palaeogene extinction event, was about 66 million years ago. Dinosaurs migrated between the Warm Temperate and Cool Temperate Zones as the seasons changed. Highlights of the Cretaceous Period The period ended with a mass extinction event where approximately 50% of all genera became extinct, including all of the non-avian dinosaurs. The Early Cretaceous Period was a time in which the Earth was undergoing a process of change. 01 Myr and the most recent Holocene Epoch from 0. The Cretaceous Period and What it was. Throughout the Cretaceous, sea level was an average of 100 meters higher than today due to continental rifting and sea-floor spreading. 6 million years ago and lasted until about 11,700 years ago. org/10. It is the last period of the Mesozoic ("middle life") Era. 5 to 64 Ma)). A tour of life over geologic time and evolution as evidenced by the fossil What was the environment like during your time period? During the Cretaceous, the continents continued to drift away from each other, so that the mammals, birds, and dinosaurs evolved separately. But soon things began to change. As more fossils are found, the number will continue to grow. The Cretaceous Period is a period of time that spans seventy-nine million years, from the Jurassic Period to the Paleogene Period. Some sources give the years of 146, 145, or 144 million to 65 million years ago. e. CRETACEOUS PERIOD - CRETACEOUS DINOSAURS 144-65 Million Years Ago: The Cretaceous period of the Mesozoic era may have seen more dinosaurs then ever before. (Technically, the first, marsupial-like mammals of the late Triassic period are known as metatherians; from these evolved the eutherians, which later branched off into placental mammals. jsp This article contains information taken from the (removed) Jurassic Park Institute site Fast Facts. The Cretaceous (/ k r ɪ ˈ t eɪ ʃ ə s /, kri-TAY-shəs) is a geologic period and system that spans 79 million years from the end of the Jurassic Period 145 7-1-2016 · The Cretaceous Period was the last segment of the Mesozoic Era. Laurasia (present-day North America, Europe, and Asia) was almost completely separated from Gondwanaland (present-day South America, Africa, India, Antarctica, and Australia). DNR's Online Privacy Policy © 2019 Maryland The Lower Cretaceous Period . 3) itself developed from a more slender form as has been shown by stratigraphical collecting in Belgium and the Netherlands (BOSCH, 1978 and CEUSTER, 1976). Continents were on the move in the Cretaceous, busy remodeling the shape and tone of life on Earth. Dinosaurs migrated between the More Info. , Bowring, S. Associated with it are warmer global temperatures and no major glaciers, which enabled the survival of large reptile dinosaurs , such as the Tyrannosaurus rex. Isurus hastalis (Fig. It began 145 million years ago and ended 66 The Cretaceous period by Josef Moravec showing Cretaceous dinosaurs Tyrannosaurus rex, Albertosaurus, Corythosaurus, Anatosaurus, Parasaurolophus, Triceratops The Early Cretaceous (geochronological name) or the Lower Cretaceous (chronostratigraphic name), is the earlier or lower of the two major divisions of the Cretaceous. River delta and strandline sandstones are the reservoir rocks for the most prolific oil field in Texas. Upper Cretaceous. The Lifestyles of the First Mammals. The third and last period of the Mesozoic Era, from about 144 to 65 million years ago. The Spinosaurus, another large carnivore lived during this period. Also during this time, we find the first The Cretaceous Period was the last and longest segment of the Mesozoic Era. Late Cretaceous These maps of major tectonic elements (plates, oceans, ridges, subduction zones, mountain belts) are used with permission from Dr. It was preceded by the Jurassic period and followed by the Paleogene period, the latter boundary also forming the demarcation between the Mesozoic and Cenozoic eras. It extended from about 144 million years ago, following the Jurassic, to about 65 million years ago, when it was succeeded by the Palaeocene epoch. The Cretaceous is usually noted for being the last portion of the "Age of Dinosaurs", but that does not mean that new kinds of dinosaurs Jan 7, 2016 The Cretaceous Period was the last segment of the Mesozoic Era. The geologic time scale is not exact, and the dates of the Cretaceous period on various scales vary by about 5 to 10 million years. New Oceans Begin to Open . 5 million years ago 26 Jan 2019 Learn more about Earth's Cretaceous period from National Geographic. During this period, life on Earth began to recover from the minor extinction event of the previous period. The last period of the dinosaur era or mesozoic era. What did Maryland Geological Survey Richard A. Cretaceous period - from 135 million to 63 million years ago; end of the age of reptiles; appearance of modern insects and flowering plants. g. The period from 201. The first ceratopsian and pachycepalosaurid dinosaurs appeared. During the Late Cretaceous there was a warm global climate with ice-free poles. Find out about which dinosaurs were around in this amazing period of time! The Cretaceous Period and What it was Have you ever heard of the cretaceous (pronounced k-r-ih-t-ai-sh—ai-s) period, when dinosaurs roamed the Earth? The Cretaceous Period: Flowers Bloom For The First Time The Cretaceous (krĭ TAY shuhs) Period is the final period of the Mesozoic Era. Many specimens have bones damaged in combats with predators. During this time, flora and fauna alike grew in size and diversified. At the start of the period, dinosaurs ruled the loosening remnants of the supercontinent Pangaea The Western Interior Seaway (also called the Cretaceous Seaway, the Niobraran Sea, the North American Inland Sea, and the Western Interior Sea) was a large inland sea that existed during the mid- to late Cretaceous period as well as the very early Paleogene, splitting the continent of North America into two landmasses, Laramidia to the west and Appalachia to the east. 8 to 0. Click the Velociraptor Cretaceous Period Dinosaur coloring pages to view printable version or color it online (compatible with iPad and Android tablets). Scientists typically avoid using the term and concentrate on Cretaceous. You can complete the definition of Cretaceous period given by the English Definition dictionary with other English dictionaries: Wikipedia, Lexilogos, Oxford, Cambridge, Chambers Harrap, Wordreference, Collins Lexibase dictionaries, Merriam Webster Pterodactyl is the common term for the winged reptiles properly called pterosaurs, which belong to the taxonomic order Pterosauria. The Cretaceous Period was the final Period of the Mesozoic Era and extended from 144 Million to 65 Million Years Ago. The Cretaceous was the last period when dinosaurs were the dominant land animals. FLOWERING PLANTS FLOURISH DURING THE CRETACEOUS PERIOD Flowering plants (angiosperms) evolved about 140 million yeasr ago, during the late Jurassic period, and The Cretaceous period was a geological period in Earth's history when large dinosaurs dominated the landscape, in particular, carnivores like the Tyrannosaurus and the Velociraptor. National Geographic Society is a 501 (c)(3) organization. b. Note the opening of the Atlantic Ocean. , Cretaceous Period) from 145. Cretaceous Period dinosaurs list with pictures and facts. The Western Interior Seaway is an ancient intracontinental seaway that occupied much of modern western North America and existed throughout much of the Cretaceous Period. The K-T Boundary Evidence for catastrophism at the Cretaceous-Tertiary boundary is found in a layer of sediment which was deposited at the same time that the extinction occurred. On this page you’ll find a list of some of the best-known dinosaurs of the Cretaceous Period, together with pictures and facts on each dinosaur. Proper noun. Cretaceous The final geological period of the Mesozoic era. 7). See 10 other animals in the Cretaceous period that roamed the Earth. Triceratops Cretaceous Period Dinosaur coloring page from Triceratops category. 5 0. 1 Bedding in chalk picked out by flint bands. dinosaurs) and ammonites were extinct by its end. The Cretaceous–Tertiary extinction event, now called the Cretaceous–Palaeogene extinction event, was about 66 million years ago. The Cretaceous time period was a time period in Earth's history and the third and final time period of the Mesozoic Era. ) laid down tens of millions of years ago. It corresponds to the end of the Cretaceous Period and the beginning of the The Cretaceous Period is the final period of the Mesozoic Era. 0 million years ago and ended 66 million years ago; it followed the Jurassic Period and was succeeded by the Paleogene Period (the first of the two periods into which the Tertiary Period was divided). It became cooler with rain and snow starting to appear. com can put you on the path to systematic vocabulary improvement. 5 to 65. By the end of the Mesozoic the arrangement of the continents is looking more like the present. No great extinction or burst of diversity separated the Cretaceous from the Jurassic Period that had preceded it. jsp Source: dp_cretaceous_dino. 5 million years ago Cretaceous Period, in geologic time, the last of the three periods of the Mesozoic Era. It lasted approximately for 79 million years. Please scroll down and check out the vast inventory that we offer. At the begining, creatures were much like that of the last period, the Jurassic Period. The world did a lot of changing in Cretaceous Period. The period was the last and the longest segment of the Mesozoic Era. Also, all the rocks that formed during that time have the same proper name of Cretaceous (i. E. The most The Cretaceous (/ k r ɪ ˈ t eɪ ʃ ə s /, kri-TAY-shəs) is a geologic period and system that spans 79 million years from the end of the Jurassic Period 145 7-1-2016 · The Cretaceous Period was the last segment of the Mesozoic Era. During the Late Cretaceous, the climate was warmer than present, although throughout the period a cooling trend is evident. It may be called the K/T Paleoart, natural history and scientific illustration of Julius CsotonyiDinoDictionary. Paul Street, Baltimore, MD 21218 (410) 554-5500. It covered the time span of 144 million years ago to 65 million years ago. Believe it or not, a huge, sweeping mountain range runs right through North Central Texas. 5 million years ago. , Director 2300 St. But they were all wiped out in an instant -- a game-changing powerful impact that eliminated most lif Cretaceous Research provides a forum for the rapid publication of research on all aspects of the Cretaceous Period, including its boundaries with the Jurassic and Palaeogene. The Cretaceous period began at the end of the Jurassic period approximately 144 million years ago. The End of the Dinosaurs. From the early Triassic to the middle Cretaceous, the concentration of atmospheric Carbon Dioxide was similar to its current density. Paleocene. Learn about the Early Cretaceous Period. Definition of Cretaceous period in the AudioEnglish. The Cretaceous period was the longest period in the Phanerozoic eon, lasting 80 million years from 145 to 66 million years ago (mya). It is usually divided into Lower (135–95 million years) and Upper (94–65 million years) periods. Cretaceous Period The Cretaceous was about 145 million to 66 million years ago. A. </p>, <p>Name 3 animals that appeared during this time</p> Kronosaurus was a marine reptile that lived in the ocean during the early Cretaceous period when dinosaurs roamed the land. As the longest geological Period, the Cretaceous constitutes nearly half of the Mesozoic. The number of dinosaurs that lived during the Cretaceous period was immense and too many to list here. The impact of a 10 mile wide comet caused global climate changes Cretaceous definition, resembling or containing chalk. The Pierre Shale is the youngest Cretaceous unit in the state of Nebraska. Sometimes. In the Cretaceous period, birds became more diverse. The Cretaceous Period was the last time dinosaurs were alive on earth. A list of animals living in the Cretaceous period. The The only way I can possibly conceive of humans living in a New Cretaceous age is as a rump of scientists and technologists working in artificial, protected shelters, rather like the denizens of The Cretaceous-Tertiary extinction event was a period of massive extinction of species, about 65. The Cretaceous is traditionally divided into Lower Cretaceous (early), and Upper Cretaceous (late), because of the different rocks. The Cretaceous time period was the third time period of the Mesozoic Era. com Marine reptiles also saw the early Jurassic period as a prime time to evolve and Ichthyosaurs and Plesiosaurs continued to grow giving birth to new marine reptiles such as the Ichthyosaurus, Temnodontosaurus, Eurycleidus, Macroplata and Rhomaleosaurus. It: 1. Cretaceous Sea. During the age of the dinosaurs 82 million years ago, Nebraska was covered with a great inland sea. The impact of a 10 mile wide comet caused global climate changes The Upper Cretaceous is the last geological epoch in the Cretaceous. 5 Million years ago. Cretaceous definition, resembling or containing chalk. This time period is most famous for the The Cretaceous Period, which dates to between 145 to 66 million years ago, is the last geological time unit of the Mesozoic Era, popularly known as the "Age of Dinosaurs. Cretaceous Period. The Cretaceous was the latest of these periods, lasting from 144 to 65 million years ago (mya). When the Early Cretaceous Period began 144 million years ago, the huge land mass known as Pangaea had already started to separate. 85 people found this useful. The tropics became restricted to WRITE A REVIEW: what do you think of our new dinosaur pages? Sheppard Software's Dinosaurs: paint the cretaceous periodMore Info. Not all Cretaceous animals were dinosaurs. Cretaceous Period The Age of the Dinosaurs. Triceratops skulls are very common occurrences in the fossil record, in coastal lowland sediments, but skeletons are rare. The geological history of the surficial units of the Clayton, Smyrna, and the Delaware portion of the Millington Quadrangles are the result of deposition of the Beaverdam Formation and its modification by erosion and deposition of the Columbia Formation during the early Pleistocene. Pierre Shale. The Cretaceous period was the third and final geological period of the Mesozic Era. It covered the time span of 144 million years Cretaceous Time Period was 65 million years ago. 65-144 Million Years Ago. It lasted approximately 79 million years, from the minor extinction event that closed the Jurassic Period about 145. The period extends from about 141 million years ago until 65 million years ago. Maps. Also during this time, we find the first fossils of many insect groups, modern mammal and bird groups, and the first flowering plants. The adjacent land area was generally low-lying except for the Llano complex of very old Precambrian and Paleozoic rocks, which stood high and exposed to erosion. Triceratops, Tyrannosaurus and Velociraptor lived at this time. The Cretaceous was succeeded by the Paleogene Period of the Cenozoic Era. The first known use of Cretaceous was in 1832. Menu Home This category is for all animals that lived during the Cretaceous Period. Cretaceous is the name given to a period of time in Earth's history (i. Great plant-eating dinosaurs roaming the earth, feeding on lush ferns and palm Kids learn about dinosaurs by playing games including Bluid a Dino. Inspired by work conducted by Museum scientists at Dry Island Buffalo Jump Provincial Park, Cretaceous Alberta provides a rare Information about the mosasaur Mosasaurus and other prehistoric creatures. Ginkgos are older than flowering plants, and modernish ginkgos first appear in the fossil record in the early Jurassic. the Cretaceous - 144 to 65 million years ago. The cause of the mass extinction that marks the end of the Cretaceous and the beginning of the Paleogene is a scientific mystery. ". During Pennsylvanian time the North American plate collided with the newly forming Pangea landmass, squeezing and buckling Texas rocks once again. Some dinosaurs went extinct, yet others adapted and some even became the ancestor's of today's many species. Many of the most famous dinosaurs, such as Tyrannosaurus and Triceratops, first appeared in the Cretaceous (kruh-TAY-shus) Period, which lasted from 144 to 65 million years ago. See more words from the same year The Cretaceous Period was a period when many famous dinosaurs lived. These oceans and seas were populated with now-extinct marine reptiles,ammonites and rudists, while dinosaurs continued to dominate on land. The Cretaceous Timescale and Paleogeography. Geologic Events 245-66 million years ago • cycads are known as king sago palm and cardboard palm in the present. org Dictionary. Dinosaurs lived during the three periods of the Mesozoic era: the Triassic, the Jurassic and the Cretaceous. There are many animals that lived back then but three that we think are awesome are Triceratops, king of the plants, Megaladon, king of the seas, and Spinosaurus, king of the Land. Cryptic epochCurrent Exhibits Cretaceous Alberta. Thick beds of Cretaceous aged chalk are characteristic of Western Europe. Ortt, Jr. Cretaceous Research provides a forum for the rapid publication of research on all aspects of the Cretaceous Period, including its boundaries with the Cretaceous Research provides a forum for the rapid publication of research on all aspects of the Cretaceous Period, including its boundaries with the Jurassic and Palaeogene. You searched for: cretaceous period! Etsy is the home to thousands of handmade, vintage, and one-of-a-kind products and gifts related to your search. , they are referred to as the Cretaceous System). Search Cretaceous period and thousands of other words in English definition and synonym dictionary from Reverso. 5 million years ago, and ended 66 million years ago. The Late Cretaceous Period, which was more than 90 million years ago, was much warmer than it is today with atmospheric CO2 levels as high as 1000 ppm, or more than double what they are currently. These oceans and seas were populated with now- extinct marine reptiles, ammonites and rudists, while dinosaurs continued to dominate on land. 5 Cretaceous Period, in geologic time, the last of the three periods of the Mesozoic Era. The Cretaceous period marks the end of the age of Cretaceous Period dinosaurs were many and varied. 71). " (English proverb) "The stripes of a tiger are on the outside; the stripes of a person are on the inside. As the supercontinents of Laurasia and Gondwana continued to drift apart, each landmass carried its own dinosaur species with it. It was deposited during the Campanian and Maastrichtian (~70-80 million years ago). of, denoting, or formed in the last period of the Mesozoic era, between the Jurassic and Tertiary periods, lasting 80 million years during which chalk deposits were Vertalingen van 'Cretaceous' in het gratis Engels-Nederlands woordenboek en vele andere Nederlandse vertalingen. The Cretaceous Period has 1,279 members. The Cretaceous is considered to be the last portion of the “Age of Dinosaurs”. It began 145 million years ago and ended 66 Dinosaurs of the Cretaceous period of the Mesozoic EraLearn more about Earth's Cretaceous period from National Geographic. Early in the Cretaceous, the shoreline of the northwestern Gulf was in the South Central Texas area (Fig. During the Cretaceous period, beginning about 145 million years ago, the continents continued to drift away from each other, so that the mammals, birds, and dinosaurs on different continents evolved separately and got more and more different from each other. It is a very different world. Cretaceous period krĭtā´shəs [key], third and last period of the Mesozoic era of geologic time (see Geologic Timescale , table), lasting from approximately 144 to 65 million years ago. It is widely known as the K–T extinction event and is associated with a geological signature, Cretaceous communities Home / Common Fossils of Oklahoma / Paleocommunities / Marine Communities / Cretaceous communities Marine communities of the Cretaceous Period were more like those of the modern world than those preserved in older rocks of Oklahoma. D. 0 million years ago and ended 66 million years ago; it followed the Jurassic Period and was succeeded by the Paleogene Period (the first of the two periods into which the Tertiary Period was divided). Pterosaurs are the earliest vertebrates known to have flown. Here are 25 species (listed alphabetically) from that time period: Abelisaurus – This Carnivore lived 80 MYA (million years ago), and was indigenous to what is now South America. The world, Early Cretaceous (Albian Age), 105 Ma, Global Paleogeographic Views of Earth History, NAU Cretaceous period the geological period which began about 135 million years BP and ended 65 million years BP. Huge and diverse creatures began to evolve. 8 Myr - 0 ] In the time scale of Lutgens & Tarbuck, the Quaternary Period is further divided into the Pleistocene Epoch from 1. With profiles of over 300 known dinosaurs, immerse yourself in a wealth of knowledge about the giants that Following its disappearance, Temperance and its population manifested in the late Cretaceous era about 66 million years ago. The Cretaceous Atlas of Ancient Life is one component of the overarching Digital Atlas of Ancient Life project. The Cretaceous ended with one of the greatest mass extinctions in the history of Earth, exterminating the dinosaurs, marine and flying reptiles, and many marine invertebrates. 1 Eustasy Under Greenhouse Conditions?. 5 to 145. The Jurassic period was followed by the Cretaceous period. 1130 中生代・白亜紀前期の世界 ( Early Cretaceous) 1億4500万年前~9900万年前 (145 million years~99 million years ago)18-3-2016 · Flying reptiles ruled the skies for millions of years. The sweeping, S-shaped feature seen on the Texas geologic map, the Ouachitas, is a result of this collision. What did dinosaurs eat?22-1-2019 · The goals of this thematic resource collection were to ascertain and organize some of the best digital resources relevant to the Cretaceous Period. • cycads have open seeds in its cone and are sometimes considered to be a palm trees but they have nothing alike at all. The oceans and seas were populated with now extinct marine reptiles, ammonites and rudists; and the land by dinosaurs. Because of the mass extinction in the Jurassic period, many of the dinosaurs present in the Jurassic period were not present in the cretaceous period. The huge Mosasaurus was the dominant marine predator. Marks the last of the major extinctions of many animals, being rivalled only in intensity by the Permian extinction; 2. The period lasted from approximately 145 to 65 million years ago, or 80 million years total. It is also the time of the appearance of modern insects, The Cretaceous period launched the onset of numerous marine transgressions, submerging much of the isthmus under warm shallow seas until the Pleistocene. Maps as pictures. Cretaceous. Sponges, extant and extinct, are an exclusively aquatic and, with a few exceptions a filter-feeding group of animals. The Cretaceous* saw the first appearance and initial diversification of flowering plants (Angiosperms). TIME - 70 - 65MYA, Late Cretaceous period. Plate Tectonic Reconstructions. Meaning of Cretaceous period. A mass extinction event at the close of this period spelled the end for Apr 15, 2014 The Cretaceous , derived from the Latin "creta" (chalk), usually abbreviated K for its German translation Kreide (chalk), is a geologic period a. Over 2000 m of limestone strata were formed in the period, including the uppermost (Miocene–Pliocene) Carrillo Puerto Formation (>300 m thick). Looking for information about the Cretaceous Era? Let's start with a list of the cretaceous dinosaurs. An intro to the Cretaceous period, includes a review of each of the geological sub-divisions and the various forms of life that lived during this time When Was The Cretaceous Period? The Cretaceous Period began 145 million years ago (Mya) and ended 66 Mya. Once mosasaurs returned to the seas in the Cretaceous, around 100 million years ago, they rapidly diversified. 29-8-2017 · The Pleistocene Epoch is typically defined as the time period that began about 2. - 85% of all species died in the End-Cretaceous (K-T) extinction. At the start of the period, dinosaurs ruled the loosening remnants of the supercontinent Pangaea The Late Cretaceous (100. 2 In the Cretaceous period, the middle of North America was covered by a shallow sea. WRITE A REVIEW: what do you think of our new dinosaur pages? Sheppard Software's Dinosaurs: cretaceous activities and games. This time period lasted from about 135 million to 65. 5 to 64 Ma). Mesozoic and Cenozoic fossil reefs. Age of Reptiles, Mesozoic, Mesozoic era - from 230 million to 63 million years ago. from about 146 to 136 million years ago to the beginning of the Paleocene of the Tertiary Period (about 65. The cretaceous period was a time in history when dinosaurs roamed the Earth, for the last time. jsp Source: dp_cretaceous_extinct. The Cretaceous is defined as the period between 145. The Cretaceous was a geologic period of time that lasted from approximately 145 to 65 million years ago. The image at the left is the most current timescale for the Cretaceous Period. LIFE DURING CRETACEOUS PERIOD (ANIMALS, LAND) Dinosaurs ruled during this period of time. in: Cretaceous Animals. This article contains information taken from the (removed) Jurassic Park Institute site Source: dp_cretaceous. During the Cretaceous Period, the climate–ocean system was in flux due to increases in tectonism, global surface and deep-water temperature, atmospheric and oceanic CO 2 concentrations, and Oceanic Anoxic Events. The Cretaceous gets its name from the latin word for chalk, creta, because it includes the layers of this distinctive pure white limestone. Quick Dimorphodon Facts: - Lived from the Middle Jurassic Period through the Late Jurassic Period - Lived in what is now Europe and Central America - Was about the size of a modern-day American Crow - Weighed less than a liter of water - Was a Piscivore or Insectivore AnimalZ Edit. 01 Myr to the present. 2. 5 and 65. How was the Cretaceous period different from the Jurassic Period? a. It is known from the middle part of the Cedar The Cretaceous was a period in Earth's history. The Cretaceous began approximately 145 million years ago at the end of the Jurassic Period and ended about 66 million years ago. Paint activities include the Triassic, Jurassic, and Cretaceous period. 6 to 65 million years ago. 0 million years ago and ended 66 million 7 Jan 2016 The Cretaceous Period was the last segment of the Mesozoic Era. The Cretaceous is usually noted for being the last portion of the "Age of Dinosaurs", but that does not mean that new kinds of dinosaurs did not appear then. But now there is evidence that the cretaceous atmosphere may have been very different. The impact of a 10 mile wide comet caused global climate changes The Cretaceous Period ends with one of the greatest known extinction events, so severe it also marks the end of the Mesozoic Era. The world, Early Cretaceous (Aptian Age), 120 Ma, Global Paleogeographic Views of Earth History, NAU. It began 136 =/-5 MYA and ended 66 +/-3 MYA, lasting about 70 million years. When did your period take place? This period was the last and longest segment that took place during the Mesozoic Era. The Cretaceous–Paleogene extinction event was a large-scale mass extinction of animal and plant species in a geologically short period of time, approximately 66 million years ago (Ma). The first flowers, ants, and butterflies also appeared during this time. 10-9-1995 · Online exhibits: Geologic time scale: Mesozoic Era. The collision also marked the end of the Cretaceous Period. - Numerous evolutionary radiations occurred during the Cretaceous (144-65 million years ago) - A major extinction occurred at the end of the period. Cretaceous period. Marks the end of tectonically driven sedimentation; 3. By the Cretaceous period, many of the continents were moving into their present-day locations The only way I can possibly conceive of humans living in a New Cretaceous age is as a rump of scientists and technologists working in artificial, protected shelters, rather like the denizens of A few things right off the bat: the Cretaceous Period lasted about 80 million years, and different habitats existed all over the world at different times; also there are two main types of modern el The Cretaceous period of the dinosaurs was a time spanning about 50 million years. Lesson 53 - Cretaceous Overview. Starting from 145 million years ago, dinosaurs were still roaming the earth, most of the species that evolved in this period have grown to emise sizes and most of them also have the best defenses. Samples of 80 million year old air have been analyzed. Back in Cretaceous times, Europe was almost all islands, surrounded by wide shallow seas. The Cretaceous period (144-65 million year ago) was a time of great change in plant life, animal life, and even the face of the Earth. Based on the 1990 novel by the late Michael Crichton, Steven Spielberg's Oscar-winning epic three years later Top; Atlas; Geology; Funding for development and construction of this webpage was provided by the National Science Foundation (DBI 1645520). Pterosaurs, however, were not dinosaurs and they are not the ancestors of modern birds. 3±0. Click on the button for list mode . The extinction wiped out the dinosaurs while most mammals, turtles What makes the Cretaceous sea worse than any other in history is that there isn't just one predator to worry about, but a whole collection of them, including sharks, lightning fast killer fish and fearsome giant marine reptiles called mosasaurs. The Jurassic Period. The 5-2-2019 · Sharks have swum in the oceans for almost 450 million years. It was preceded by the Jurassic and followered by the Paleocene Epoch. . In works about astronomy, or those in which other celestial bodies are referenced, uppercase them CO2 was higher in the past "The killer proof that CO2 does not drive climate is to be found during the Ordovician- Silurian and the Jurassic-Cretaceous periods when CO2 levels were greater than 4000 ppmv (parts per million by volume) and about 2000 ppmv respectively. By using these data, geologists reconstruct pictures of the geography of the North American Continent during each of the various periods of geologic time, such as the Great Ice Age (Pleistocene Epoch), the Age of Dinosaurs (Cretaceous Period), and the Coal Age (Pennsylvanian Period). The horned Cretaceous dinosaurs appeared, like the Triceratops and Centrosaurus. 8 million years ago. In the Triassic Period all land was joined together as one great landmass. It was the third and final period of the Mesozoic Era. Select from 30933 printable crafts of cartoons, nature, animals, Bible and many more. The Cretaceous is named after the white limestone known as chalk which occurs widely in northern France and is seen in 4. The cretaceous was the last time period of the mesozoic era lasting from 145 to 65 million years ago. One might say that nature has provided the sample bottle. Click here if you would like to learn how to search in two categories at once. From the late cretaceous to the early Miocene, the concentration climbed above 210 ppmV. In some ways, things went on as they had. All rights reserved. Age of Dinosaurs. This interval of time spanned approximately 80 million years and is divided into two Epochs, Early and Late. There was a minor mass extinction at the end of the Jurassic Period that is the sign of the beginning of the Cretaceous. 3 million years ago (Ma). The presence of a large amount of kaolinite in the Lower Cretaceous sediments of Zagros area was in accordance with the warm and humid climate of that period. The Cretaceous period marks the end of the age of Dinosaurs with what is known as the Great Extinction. The main impact on reefs was the collapse of the reefs of the Tethys, . 2 to 145 million years ago, after the Triassic and before the Cretaceous; the geologic systems of this period. jsp Source: dp_cretaceous_ecol. Check out our guide on Goshoura Cretaceous Period Museum in Amakusa so you can immerse yourself in what Amakusa has to offer before you go. One of the most feared creatures in that sea was the Tylosaurus, the largest mosasaur and dominant predator in the sea during the cretaceous period. Twelve species of Cretaceous aged Tempskya have been reported from North America, eight or possibly ten from Europe, one from Japan, one from Argentina, and one from Australia (Tidwell & Wright, 2003, pp 141-143; Clifford & Dettmann, 2005, p. The Cretaceous period followed the Jurassic period on the geological time scale; it was the last period in the Mesozoic era. . He examined the information and the samples, and confirmed that these fossils belong to Cretaceous period in 73 million years ago," she added. The Late Cretaceous (100. As the continents separated, the climate The Cretaceous period was 144-65 million years ago. During most of the late Cretaceous, much of Texas lay beneath marine waters that were deeper than those of the early Cretaceous seas, except where rivers, deltas, and shallow marine shelves existed. In nontechnical contexts, sun and moon are often lowercased: […]. This event was responsible for wiping out 3/4th of all animal and plant species that lived on Earth during that period. A mass extinction event at the close of this period spelled the end for dinosaurs. Reconstructions of Cretaceous wildlife (dinosaurs and other prehistoric life) and environments by award-winning scientific illustrator Julius Csotonyi. Cretaceous Period ~THE FALL OF A DYNASTY~ Here are some species from the Cretaceous period, which lasted 145-66 million years ago. See what you know about this period using this interactive quiz and printable THE CRETACEOUS PERIOD THE CRETACEOUS PERIOD The Cretaceous period was the heyday of the dinosaurs. 0: Geological Society of America, https://doi. This period was notable because it marked the end of the dinosaurs. • cycads are rare and females have seeds while males have ornamental red cones. The end of the Triassic was marked with a mass extinction that was not the equal of the extinctions that marked the end of the Paleozoic 45 million years earlier, but it may have rivaled the extinctions at the end of the Mesozoic. Volcano erupting. Cretaceous Animals. This period is notably the last period in which large non-avian Dinosaurs, and various other Mesozoic Era animals, lived on Earth. 0 million years ago and ended 66 million Jan 26, 2019 Learn more about Earth's Cretaceous period from National Geographic. Triceratops remains were first discovered in 1887 (Colorado, USA). (a) Regular bedding in Maastrichtian chalk picked out by flint bands, overlain by irregularly bedded flint bands in the top section of the cliff (coral-bryozoan The Cretaceous was a period in Earth's history. W. Only the hills and mountains of Scandinavia in the north towered above the waters. Magnificent and terrifying dinosaurs ruled the kingdom. See our stories at NationalGeographic. Scientists call this super-continent Pangaea, which means “All Earth”. It may be called the K/T Dinosaur Extinction Dinosaurs inhabited the earth for over 165 million years, during the Mesozoic Era. The impact of a 10 mile wide comet caused global climate changes WRITE A REVIEW: what do you think of our new dinosaur pages? Sheppard Software's Dinosaurs: paint the cretaceous periodMore Info. 3. The Cretaceous was marked, in both North America and Europe, by extensive submergences of the continents. Click here for an explanation of map symbols. The dominance of flowering plants began during this period and large reptiles (e. The Jurassic period had angiosperms, while the Cretaceous did not. The Cretaceous was a period with a relatively warm climate, resulting in high eustatic sea levels and creating numerous shallow inland seas. , Name a dinosaur that lived during the Cretaceous&nbsp;period. The set includes an Ankylosaurus, Parasaurolophus, Spinosaurus, Triceratops, and Tyrannosaurus rex. The Cretaceous Period was the last of three geologic time periods in the Mesozoic Era. 5. Life-forms in the Cretaceous Period were dinosaurs, flying reptiles, marine reptiles, amphibians, lizards, crocodilians, snakes, early birds, and early mammals. The Cretaceous period began at the end of the Jurassic period approximately 144 million years ago. Late Cretaceous Climate. Cretaceous Period Information. The impact of a 10 mile wide comet caused global climate changes The Cretaceous (/ k r ɪ ˈ t eɪ ʃ ə s /, kri-TAY-shəs) is a geologic period and system that spans 79 million years from the end of the Jurassic Period 145 7-1-2016 · The Cretaceous Period was the last segment of the Mesozoic Era. , compilers, 2018, Geologic Time Scale v. The Cretaceous-Tertiary extinction event (abbreviated as K-T extinction) is also known as the Cretaceous-Paleogene extinction event (abbreviated as K-Pg extinction). During the Late Cretaceous the global climate was warmer than today's climate. The name of the period is derived from creta (Latin: chalk) and the Cretaceous was characterized by the deposition Cretaceous Introduction The Cretaceous period extends from 145. It is a type of pliosaur. com is your resource for hunting dinosaurs. 1. Mu Ramkumar, in Cretaceous Sea Level Rise, 2016. Fossils of the Cretaceous Period Also see: Mesozoic Paleobiology26-11-1995 · The Cretaceous is usually noted for being the last portion of the "Age of Dinosaurs", but that does not mean that new kinds of dinosaurs did not appear The Cretaceous (/ k r ɪ ˈ t eɪ ʃ ə s /, kri-TAY-shəs) is a geologic period and system that spans 79 million years from the end of the Jurassic Period 145 7-2-2019 · Cretaceous Period: Cretaceous Period, in geologic time, the last of the three periods of the Mesozoic Era. It was the last period of the Mesozoic era. Cretaceous Period Facts. With enormous teeth adapted for cutting flesh, this predator ruled the world in which it lived. cretaceous period This period was the longest and the last period of this era. Introduction. The Cretaceous period marks the end of the age of 15 Apr 2014 The Cretaceous , derived from the Latin "creta" (chalk), usually abbreviated K for its German translation Kreide (chalk), is a geologic period a. period (n. The Upper Cretaceous is the last geological epoch in the Cretaceous. Time Traveler for Cretaceous. The Atlantic Ocean began opening up between Europe 146 to 65 mya. " Cretaceous Period: Life. During the Cretaceous the South Atlantic Ocean opened. 20-1-2019 · Explore the dinosaurs, marine animals, and other life from the Triassic, Jurassic, and Cretaceous periods. 5–66 Ma) is the younger of two epochs into which the Cretaceous period is divided in the geologic timescale. Bring the magic of dinosaurs to your child's bedroom with this Cretaceous Period Mural. The true golden era of dinosaurs. The Cretaceous Period By Cindy Grigg. Electrorana limoae: A new species of Frog from Cretaceous Burmese Amber. The articles are focused on the second half of the Mesozoic: four in the Middle-Late Jurassic or the Jurassic- Cretaceous interval, four in the Early Cretaceous and four in Cretaceous Period. The Western Interior Seaway, also called the Cretaceous Seaway, the Niobraran Sea, and the North American Inland Sea, was a huge inland sea that split the continent of North America into two halves during most of the mid and late Cretaceous Period. Pangaea split during the Jurassic period. 9 Responses to “How to Treat Geological and Astronomical Terms” Peter on May 20, 2011 4:25 am. Best Answer: Cretaceous period (krĭtā´shs) , third and last period of the Mesozoic era of geologic time (see Geologic Timescale, table), lasting from approximately 144 to 65 million years ago. In 1822, Omalius d'Halloy termed the chalky rocks (Latin: "creta") found on the English and French sides of the English Channel "Cretaceous. It is the youngest period of the Mesozoic era, and at 80 million years long, the longest period of the Phanerozoic eon. rex was likely the only large carnivorous [flesh-eating] dinosaur that lived in the area in the Late Cretaceous Period. Some developed teeth for crushing shells, and some even expanded into fresh water environments. Media in category "Cretaceous" The following 58 files are in this category, out of 58 total. In some ways, things went What Cretaceous plants were around in the Cretaceous Period. More andvanced species appered. This due to dinosaurs being the most conspicuous and perhaps most numerous vertebrate during this age. the geological period which began about 135 million years BP and ended 65 million years BP. The Cretaceous Period - 1 The Cretaceous Period of the Mesozoic Era: 146 to 65. (1996) or Hancock (1983), the Cretaceous period marks a watershed in earth’s history. Eomaia, (left), a mouse-sized Cretaceous mammal, was an early ancestor of the placental mammals (all mammals which nourish the fetus internally, like humans). The Cretaceous Period also is divided into 12 smaller units, called Stages. The Cretaceous Period. The Complete Book of Dinosaurs: The ultimate reference to 355 dinosaurs from the Triassic, Jurassic and Cretaceous periods, including more than 900 illustrations, maps, timelines and photographs Cretaceous–Paleogene mass extinction. Flowering plants developed more, and became the dominant plants on land. Ending the Mesozoic Era and lasting almost 80 million years ago, the Cretaceous Period ran from about 145 million to 66 million years ago. You might also be interested in coloring pages from Velociraptor category. These include: salamanders, turtles, crocodiles, snakes, and frogs. Following period. " The name is now What caused the extinction? Several lines of geological evidence indicate that an asteroid that was as much as 10 kilometers (6 miles) in diameter hit the Earth at the end of the Cretaceous Period. The Cretaceous Period is the final period of the Mesozoic era. The air of the Cretaceous period was filled with flying reptiles called pterosaurs (which means "winged lizard"). , Cretaceous Period) from 145. The Cretaceous began 145. The Cretaceous Sea exhibit at Hastings Museum features a 30-foot life-sized Lesson 53: Cretaceous Overview