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Dinosaurs of the Jurassic Period

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Dinosaurs of the Jurassic Period

Jurassic Period- 206-144 mya
• Took place roughly 210 million years ago.
• Lasted around 70 million years
• This was the second(middle) period of the three divisions of the Mesozoic era.
• Age of the Dinosaurs, first bird life.
Bower proclaimed that the "Triassic period began about 20 million years ago, and the Jurassic period began 210 million years ago"(1986).
During the Mesozoic, or "Middle Life" Era, life diversified rapidly and giant reptiles, dinosaurs and other monstrous beasts roamed the Earth. The period, which spans from about 252 million years ago to about 66 million years ago, was also known as the age of reptiles (Ghose 2013).
There is little supporting evidence that plant life is truly from the early Jurassic time frame, however, Brannan's research suggests "At the beginning of the Jurassic period the Earth saw the disappearance of seed-fern floras but the gymnosperms and true ferns were thriving"(Brannan 2012).

Early Jurassic- The Liassic Epoch (176 to 200 mya)
• Brought much warmer/wetter rainforest climate
• Marine reptiles evolved such as, Ichthyosaurus, Temnodontosaurus, Euycleidus.
• Terrestrial animals made an appearance such as the Stegosaurs, Tetanurae, Berberosaurus, Heterdonosaurids.
In the Early Jurassic, the Colorado Plateau region again became arid and the eolian sandstones record zonal as well as monsoonal circulation (Parrish 1993).
Following the dramatic decline, ichthyosaur diversity increased again to reach pre-extinction levels in the Early Jurassic, after which the group dwindled in diversity through the Middle and Late Jurassic and much of the Cretaceous until it disappeared at the end of the Cenomanian, 100 Ma, after 150 Myr of significant ecological dominance(Thorne, Ruta, Benton 2011).
Berberosaurus is the oldest known abelisauroid, and it represents a considerable temporal range extension for a lineage whose other members are Neocomian (Sereno et al., 2004) or younger (Tykoski and Rowe, 2004), except if the material from Tendaguru, recently described by Rauhut (2005), is proved by a future phylogenetic analysis to be an abelisauroid. Its presence implies a previously unrecognized diversification of ceratosauroids by the Early Jurassic (2005), is proved by a future phylogenetic analysis to be an abelisauroid. Its presence implies a previously unrecognized diversification of ceratosauroids by the Early Jurassic(Allian, Tykoski, Aquesbi, Jalil, Monbaron, Russell, Taquet 2007).

Middle Jurassic- The Dogger Epoch (176-161 mya)
• Flying small carnivores such as Peterosaurs, and Spenosuchid
• Beginning of the separation of Pangaea into Laurasia and Gondwana with the formation of the Atlantic Ocean.
• New terrestrial life such as Sauropods, Hypsilophodant, and the Brachiosaurs.
A new pterosaur (Mesozoic flying reptile) from the Middle Jurassic of China, Darwinopterus modularis gen. et sp. nov., pro- vides the first insights into a prominent, but poorly understood transition between basal, predominantly long- tailed pterosaurs and the more derived, exclusively short-tailed pterodactyloids(Lu, Unwin, Jin, Liu, Ji 2010).
The separation of Pangaea "happened around 200 million years ago, the supercontinent began to break up, forming the two continents Gondwana and Laurasia"(Ghose 2013).
Due to the breakup of Pangea, "About 180 million years ago the central Atlantic Ocean opened up between North America and northwestern Africa"(Briney).
Sauropods "dominated ecosystems for more than 100 million years from the Middle Jurassic to the end of the Cretaceous, setting a record that mammalian herbivores will only match if they can double their current geological survival time"(Sander, Clauss 2008).

Late Jurassic- The Malm Epoch (161-146 mya)
• Giant Sauropods (Mamenchisaurus, Stegosaurus) lived.
• Certain species died out. (giant Sauropods)
• How did the Jurassic period end? Minor mass extinction of Diplodocus and Branchiosaurus.
The size and body mass of the Sauropods "suggest that the unique gigan tism of sauropods was made possible by a combination of phylogenetic heritage (lack of mastication, egg-laying) and a cascade of evolutionary innovations (high growth rate, avian-style respiratory system, and a flexible metabolic rate)(Sander, Clauss 2008).
Vegetation and climate reconstructions indicate that the late Jurassic lacked a tropical ever wet biome, which is associated in today's world with high biodiversity(Rees, Noto, Parrish, Parrish 2004).
Selenium may have been the main cause for the extinction of dinosaurs and other animal species at the end of the Mesozoic Era(Koch 1967).
It is proposed that dinosaurs and other animal species that relied upon abundant vegetation for food were poisoned by selenium(Koch 1967).
It's widely believed that the dinosaurs were wiped out by a cataclysmic event such as the crash of a giant meteor that was hurled to Earth(Koch 1967).
Ward speculates that the same kind of thing may have happened in the mass extinction 200 million years ago, paving the way for dinosaurs. "This is the first time ever that we can see how sudden this event was," said Peter Ward, a University of Washington paleontologist who led the team that reported the new research in the May 11 issue of Science. "It was very quick, not a long, protracted episode."(Parsell 2001).

Works Cited
Allian, Ronan, Ronald Tykoski, Najat Aquesbi, Nour-Eddine Jalil, and Michael Mondaron. "An Abelisauroid (Dinosauria: Theropoda) from the Early Jurassic of the High Atlas Mountains,." Journal of Vertebrate Paleontology, 27.3 (2007): 610-24
Benton, MJ & DAT Harper (1997), Basic Palaeontology. Longman, 342 pp.Cornet, B & NG McDonald (1995), A new cheirolepidiaceous conifer from the Lower Jurassic of North America.
Bower, B. "Nova Scotia Fossils Illuminate 200-Million-Year-Old-Changes." Science News 129.6 (1986): 86.
Brannan, Amy. Jurassic Period Plants. Jurassic Times, 16 Jan. 2012. Web. 17 Sept. 2014. .
Briney, Amanda. "Pangaea." All About the Supercontinent Pangaea. About education, 2014. Web. 17 Sept. 2014. .
Ghose, Tia. Mesozoic Era: The Age of Reptiles. Live Science, 1 Aug. 2013. Web. 17 Sept. 2014. .
Koch, Neil C. "Disappearence of the Dinosaurs." Journal of Palentology 41.4 (1967): 970-72
Lu, Junchang, David M. Unwin, Xingsheng Jin, Yongqing Liu, and Qiang Ji. "Evidence for Modular Evolution in a Long-Tailed Pterosaur with a Pterodactyloid Skull." Proceedings: Biological Sciences 277.1680 (2010): 383-89.
Parrish, Judith T. "Climate of the Supercontinent Pangea." The Journal of Geology 101.2 (1993): 215-33
Parsell, D L. Mass Extinction That Led to Age of Dinosaurs Was Swift, Study Shows. National Geographic News, 10 May 2001. Web. 19 Sept. 2014. .
Rees, P.McAllister, Christopher R. Noto, J.Michael Parrish, and Judith T. Parrish. "Late Jurassic Climates, Vegetation, and Dinosaur Distributions." The Journal of Geology, 112.6 (2004): 643-53
Sander, Martin, and Marcus Clauss. "Sauropod Gigantism." Science 322.5899: 200-01
Thorne, Philippa M., Marcello Ruta, and Michael J. Benton. "Resetting the evolution of marine reptiles at the Triassic-Jurassic boundary." Proceedings of the National Academy of Sciences of the United States of America, 108.20 (2011): 8339-44

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