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Historical Geology

Historical Geology. Era- Precambrian.

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Historical Geology

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  1. Historical Geology

  2. Era- Precambrian This period is about 5 times as long as the Paleozoic and Mesozoic combined, a very long time. Less is known about it than the younger time periods. The oldest fossils are of bacteria dating from 3000 M. The oldest rock is dated at 3800 M. The Earth is thought to be 4600 M years old. Periods within the Precambrian • PROTEROZOIC • ARCHEAN

  3. Era- Paleozoic • The Cambrian period, at the beginning of the Paleozoic, was the first time that multicellular life forms flourished on Earth. By the end of the Paleozoic, and beginning of the Mesozoic, all the continents of the Earth came together to form the giant continent called PANGAEA and dinosaurs began to roam on land. http://www.windows.ucar.edu/tour/link=/earth/geology/hist_paleozoic.html Periods of the Paleozoic PERMIANCARBONIFEROUSDEVONIANSILURIANORDOVICIANCAMBRIAN

  4. Era- Mesozoic • The Mesozoic is the period in which the dinosaurs lived, and its end was marked by the K-T extinction. This extinction event dramatically changed the Earth's flora and fauna, and its causes are still being investigated by scientists around the world. During the Mesozoic, the giant continent Pangaea broke apart into the continents we have today. • http://www.windows.ucar.edu/tour/link=/earth/geology/hist_mesozoic.html Periods of the Mesozoic CRETACEOUSJURASSICTRIASSIC

  5. Era - Cenozoic • The beginning of the Eocene was a period when the Earth was very hot, with palm trees and alligators at the north pole. Earth but cooled by the start of the Quaternary. This period relates to today's concern about global warming. Homo sapiens evolved and Ice Ages occurs towards the end of this time. The Little Ice age (which is not a true ice age) occurred a few hundred years ago. • http://www.windows.ucar.edu/tour/link=/earth/geology/hist_cenozoic.html • Periods of the Cenozoic • HOLOCENEPLEISTOCENEPLIOCENEMIOCENEOLIGOCENEEOCENEPALEOCENE

  6. Paleozoic Periods- Old Life • Cambrian 570 M-500 M Earliest Record of Marine life- Trilobites are dominant • Ordovician500M- 435 M Echinoderms ( Starfish, Sand dollar , sea urchin and sea cucumbers). Invertebrates are dominant, mollusks become abundant. Earliest Fish that are Jawless and later, jawed and armored fish. • Silurian435 M- 395M Earliest terrestrial plants and animals. Tiktaalik Eurypterids develop • Devonian395 M- 345M Armored fish go extinct, but abundance of several species of fish. Earliest amphibians and ammonites. • Carboniferous345M-280M (Mississippian, Pennsylvanian) Abundant sharks and amphibians. Large swamps and coal forming forests. Earliest reptiles. Scale trees and seed ferns • Permian280 M-225M Extinction of many types of marine animals including trilobites.

  7. Mesozoic Periods- Middle Life • Triassic- 225M-195M Earliest Dinosaurs, abundant cycads and conifers • Jurassic- 195M-136M Earliest birds and mammals abundant dinosaurs and ammonites • Cretaceous-136M-65M Earliest flowering plants, climax of dinosaurs followed by their extinction. Great decline of brachiopods. Abundance of bony fish.

  8. Cenozoic Periods- New Life • Tertiary- 65 M- 1.8M Earliest Placental Mammals, modern mammals, large running mammals • Quaternary- 1.8 M – Present Large Carnivores, Neanderthals, Humans, mastodons

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