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3 rd MP GEOLOGIC HISTORY PROJECT

3 rd MP GEOLOGIC HISTORY PROJECT. ORDOVICIAN PERIOD By: Mrs. Sharp.

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3 rd MP GEOLOGIC HISTORY PROJECT

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  1. 3rd MP GEOLOGIC HISTORY PROJECT ORDOVICIAN PERIOD By: Mrs. Sharp Early in the 300 million year history of the Paleozoic era, atmospheric oxygen reached its present levels, generating the ozone shield that screened out ultraviolet radiation and allowed complex life to live in the shallow seas and finally on land. This era witnessed the age of invertebrates, fish, tetrapods, and reptiles. During this time invertebrates were dominant, life emerged from the sea to colonize the land, and plants began to flourish. Mild to tropical conditions with warm shallow seas existed in the Ordovician Period and ice ages followed.

  2. ORDOVICIAN PERIOD Occurred: 488 MYA EON: Precambrian ERA: Paleozoic PERIOD: Ordovician EPOCH: Early, Middle, Late

  3. LIFE ON EARTH Earth’s first coral reefs Invertebrates dominant Despite the tremendous expansion of life during the Ordovician Period there was a devastating mass extinction of organisms at the end of the Ordovician. This extinction was perhaps the greatest mass extinction ever recorded in Earth’s History with 98% of life on Earth going extinct. Why? The most likely cause is that the Earth cooled, particularly the oceans where most of the organisms lived during the Ordovician Period. (Note: there were no land plants and no evidence of land organisms yet). All the extinctions occurred in the oceans.

  4. NY ROCK RECORD 488 MYA – 444 MYA Ordovician Period Duration: 44 million years Evidence of solid bedrock found in NYS

  5. TIME DISTRIBUTION OF FOSSILS (including important fossils of NY) • Trilobites (Cryptolithus) • Nautiloids (Valcouroceras) • Crinoids and Graptolites (Tetragraptus, Dicellograptus) • Eurypterids and corals (Lichenaria) • Gastropods (Maclurites) and brachiopods In the Ordovician, life consisted of invertebrates (organisms lacking a backbone), such as brachiopods, trilobites, and corals, shown in the following picture. These organisms were suited to survive in the warm waters of the ancient ocean and a climate similar to the climate of the Caribbean today.

  6. IMPORTANT GEOLOGIC EVENTS IN NEW YORK Taconian mountain building orogeny caused by the closing of the western part of Iapetus Ocean and collision between North America and volcanic island arc. Erosion of Taconic Mountains. Queenston delta forms. INFERRED POSITIONS OF EARTH’S LANDMASSES North America was located near the Equator at this time.

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