Mesozoic

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    The Mesozoic Era was a point in time about 252 to about 66 million years ago. During this era, there were three periods. The Triassic period, The Jurassic Period, and The Cretaceous period were all very significant in earth’s evolution. Not just in animals, but in land, plants, climate, and even insects. The Triassic period was the first period of the Mesozoic era and occurred between 251 and 200 million years ago. At this time the earth was very bare. The planet was recovering from an event that caused a great mass extinction of over 90% of the earth’s species. It did however have some advantages. Those species that did survive repopulated the planet and created new creatures such as rodent-sized mammals and even the very first dinosaurs.…

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    and final period was the Permian Period during this period there was the biggest mast extinction to ever come. The climate went through extreme conditions. The supercontinent of Pangea had extreme cold weather the south was cold and dry, and the majority of the area was covered in ice caps. The northern area dealt with immense heat and moist and arid conditions. Also the swamp forests from the Carboniferous period were being replaced by gymnosperms plants. Also reptiles have developed a bit more…

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    Way back when, humanity had such a strong past. Nothing appeared. Time was time. Nothing is nothing. The four eras that made history. Precambrian, Paleozoic, Mesozoic, Cenozoic. Historians and Scientists, did research for years and years. What happened during the Precambrian Era, nobody had a clue. Until humans researched the resources left behind. Back in the Precambrian Era . Earth was born. 4.6 million years ago, not even that many.! Stars and the planets were too! Rocks and much…

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    San Diego Geography Essay

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    The location I chose for this assignment is my home county, San Diego. San Diego is known for having the best weather in the United States, which it can attribute to its geology. San Diego is also well known for consistent droughts; however, its current unique geography is a result of ancient rivers and seas depositing Cretaceous and Tertiary sedimentary rocks. As a result of these ancient rivers, “San Diego County can be divided between three distinct geomorphic regions: the Coastal Plain…

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    The Volcanic Theory answers many questions that the Impact Theory poses, for example, volcanic activity acts over a much longer time span than an impact does, which would explain the irregular iridium peaks found in areas of the globe; and it also accounts for the selective extinction that occurred (refer to example of amphibians that did not become extinct during the Mesozoic period) (Pasichnyk,…

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    Keywords— Non-Avian Dinosaurs, Mass extinction, Dinosaurs extinction theories; Asteroid impact; Volcanism; I. INTRODUCTION Dinosaurs are the certain group of reptiles which influenced and ruled the earth for more than 160 million years, which are descendant from the species called Archosaurs. These huge reptile creatures were of various shapes and sizes, from frightening huge Spinosaurus to the small sized Microraptor. Dinosaurs were lived in a Mesozoic era which comes in between approx. 230…

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    A food chain usually has three levels, the producers, primary consumers, and the secondary consumers. During the Mesozoic Era, many trees and ferns were producers, and herbivores like the Ankylosaurus were primary consumers. This meant that the primary consumers devoured the producers. Then, the secondary consumers consisted of carnivores such as the Spinosaurus. These secondary consumers ate the primary consumers. Today, the producers would be regular plants, the primary consumers would be…

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    If the extinction of the dinosaurs was gradually over millions of years “both process probably played a role”(DinoBuzz). Most scientists do agree that an asteroid was a factor, it’s also acknowledged thaDinosaurs roamed the earth for 163 million years.(Dinosaur Worlds). They thrived as one of the most successful groups of animals in the history of life on land(PBS). Then, 66 million years ago, the last group of dinosaurs disappeared forever; leaving us with the question - what killed the…

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    large but they did not need to be endotherms; they could be homeotherms; they would warm up slowly and cool very slowly, so they could maintain a near-constant body temperature. 3. The bone structure of some dinosaurs exhibit lines of arrested growth, showing that growth was seasonal. Modern endotherms do not have of arrested growth, and modern ectotherms have. 4. Ectotherms are generally scaly. Dinosaur fossilized skin impressions show somewhat scaly hides. 5. The absence of nasal respiratory…

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    Antler Orogeny Model

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    enclaved region formed by the post Antler tectonism including: Late Paleozoic deformation, uplift and removal of some parts of the Roberts mountain allochthon; emplacement of the Golconda allochthon over Roberts Mountain allochthon; Jurassic and Cretaceous of the Cordilleran fold and thrust belt; and Cenozoic Basin and Range Tectonism. Speed and Sleep (1982) focused on the enclaved region to support the Arc-collision hypothesis, and they believed that within this enclaved region (1) Antler…

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