and plant species on earth went extinct. This mass extinction is known as the Cretaceous-Paleogene (K-Pg) extinction event. The Cretaceous was the last period of the Mesozoic Era which is when dinosaurs lived from about 250 to 65 mya and the Paleogene is the first period of the Cenozoic Era that started about 65 mya which is the Era that we are currently living in. So the extinction event marked the end of the Cretaceous period and the beginning of the Paleogene period hence the name of the extinction
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the Permian extinction. It has been estimated that the Permian extinction wiped out approximately 95% of marine life and about 70% of all other species on the plant. The Mesozoic era consists of three geological time periods Triassic‚ Jurassic and Cretaceous. In the era of Mesozoic period the earth’s continents were a supercontinent‚ Pangaea‚ fit together like a puzzle. Because of this the climate was very warm with mild climates. The Triassic period is the first period the Mesozoic ear. It began
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The Cause of the Mass Extinction in the Late Cretaceous Period Dinosaurs first appeared around 245 million years ago‚ and they lived for 180 million years. Then suddenly‚ 65 million years ago they went extinct. Not only did all the dinosaurs die out‚ but also up "to 75% of all marine genera were lost" ("mass extinction"). This leaves scientists wondering about what could have led to this mass extinction in the Cretaceous Period. They have collected evidence from fossils and earth’s geography‚ to
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The most powerful creatures ever to live on earth had become extinct. Dinosaurs were not the only victims of this "mass extinction." There were many other species that were killed off. During what is known as the K-T extinction (K stands for Cretaceous‚ T stands for Tertiary)‚ many species and families became extinct. These include all marine reptiles such as plesiosaurs‚ mosasaurs‚ ichthyosaurs‚ and ammonites‚ swimming and flying reptiles‚ sea crocodiles‚ and foraminifera. In addition to that
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extinction can be caused by disruptive global environmental changes‚ where large numbers of species have become extinct (Urry et al. 2008). There have been five major extinctions documented based on fossil records over the past 500 million years‚ but the Cretaceous (KT boundary extinction – a name that meant it began the Tertiary era) extinction caught a lot of attention (Elewa et al 2009). This event extinguished more than half of all marine species and eliminated many families of land (terrestrial) plants
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Bibliography: . JAMES L. POWELL‚ Night Comes to the Cretaceous: Dinosaur extinction and the transformation of modern geology‚ W.H. Freeman and Company‚ New York‚ 1998. . J. DAVID ARCHIBALD‚ Extinction and Radiation: How the fall of the dinosaurs led to the rise of mammals‚ The Johns Hopkins University Press
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it. Sex: Testes function only in a narrow range of temperature. (Those of mammals hang externally in a scrotal sac because internal body temperatures are too high for their proper function.) A worldwide rise in temperature at the close of the Cretaceous period caused the testes of dinosaurs to stop functioning and led to their extinction by sterilization of males. Drugs: Angiosperms (flowering plants) first evolved toward the end of the dinosaurs’ reign. Many of these plants contain psychoactive
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by meteor are not inconsistent with one another. It may very well be the case that all terrestrial life on earth. one instance in which volcanoes had a major impact on dinosaurs but it happened at the end of the triassic period and not during the Cretaceous period.If giant dinosaurs had to breathe in a low-atmosphere environment‚ then such an efficient breathing system would have given them a survival advantage. Based off the the research it is said that the dinosaurs were in decline anyway and that
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so profound that they define the geological boundary between the older Mesozoic Era‚ often called the "Age of Reptiles‚" and the modern Cenozoic Era‚ the "Age of Mammals." <br><li>On a finer scale‚ the extinctions define the boundary between the Cretaceous (geological symbol‚ "K")‚ and Tertiary ("T") periods. This mass extinction is usually referred to as the K-T extinctions. The dinosaurs became extinct during the K-T mass extinction. To examine how the K-T extinctions fit into a broader perspective
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THE GEOLOGIC TIMESCALE Divisions of Geologic Time * Eras are subdivided into periods...periods are subdivided into epochs. * Geological time begins with Precambrian Time. Precambrian time covers approximately 88% of Earth’s history. FOUR Eras… * PRE-CAMBRIAN – 88% of earth’s history * Paleozoic (ancient life) * 544 million years ago…lasted 300 million yrs * Mesozoic (middle life) * 245 million years ago…lasted 180 million yrs * Cenozoic
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