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Sidney , Montana
November 26, 2003     Sidney Herald
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November 26, 2003

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2003 SIDNEY HERALD 7A World of nde EXPLORING THE REALMS OF HISTORY, SCIENCE, NATURE of four period marked the beginning of a time of Y for life on Earth Mass extinctions at the end of the -- the Permian --- were brought about by all-time levels, global climate changes, and low oxygen levels in and water. brought major developments in the surviving land the emergence of ruling reptiles, called the which dominated the land and land plant life l Significantly. Life in the sea ..... flourish again, and ..... ::: ........... mollusks first primitive },~ ............ 7~... : 1 Eudimorphodon (YOU-die-MORF-o-dahn) Wingspan: About 2.5 feet (.75 m) Flying reptiles, or pterosaurs, evolved about 70 million years before the first-known birds. Eudimorphodon is the earliest- known, and had very sharp, pointed teeth, probably to help it catch fish. Most of the animals on this page never shared the same habitat or lived at the same time, but they are shown in scale with each other. ' Placerias Plateosaurus (pluh-SEHR-ree-uhs) Length: About 11.5 ft (3.5 m) A hippopotamus-like, herding therapsid, or mammal-like rep- tile, it was not a dinosaur Placerias ate roots, ferns, moss and other low-lying plants. Length: About 26 feet (8 m) Heavily built, it usually walked on all four legs but could stand on its hind legs to reach the tree leaves that it ate. Its five-fingered hands could grasp food. Triassic refers rocks of this found in agree there LWorldwide dmaster about 200 toward Triassic peri- believe evidence :)r impact, a that elimi- major and allowed to evolve and f during the - Penod. mollusks in the distinct forms shells are or fossils to aid g the rock strata. in time Coelophysis (seal-OH-fie-sis) Length: About 10 feet (3 m) The best skeletal remains were discovered in 1947 by Edwin Colbert at Ghost Ranch, N.M. Several hundred animals were jumbled together in a mass grave. Phytosaurs, fish, clams and crayfish were also found at the site, providing a snapshot of the Triassic ecosystem, SOURCES: history.htm; The Macmillan Illustrated Encyclope~a of Dinosaurs and Prel'~toric Mammals, 1988,. Macmillan, New York:,ukldinosaurs/ index.shtml. Euparkeria ( Length: About 2 feet (.6 m) Euparkeria is a close relative of the archosaurs. Its body form is unusual for reptiles of the time, in that the hindlimbs are longer than the forelimbs. Scientists believe it is a sister group to all other Archosauria, or is part , of the I neage leading to dinosaurs. ,::k ,'a~}~}~i ::81::"~ ~:'~# ,.:$~::.> :[!: ~$~::g$": :