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Epochs

Epochs. By: Anakin, Matthew, Vivian, Mina. Cambrian. The Cambrian started 542 million years ago. The climate was cold at first but then it became warm over the years. It was an explosion of invertebrate life forms. Ordovician. Ordovician started 488.3 – 443.7 million years ago.

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Epochs

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  1. Epochs By: Anakin, Matthew, Vivian, Mina

  2. Cambrian • The Cambrian started 542 million years ago. • The climate was cold at first but then it became warm over the years. • It was an explosion of invertebrate life forms.

  3. Ordovician • Ordovician started 488.3 – 443.7 million years ago. • The Ordovician period is the second period of the Paleozoic Era. • Life was found mainly underwater.

  4. Silurian • The Silurian Epoch occurred 455 million years ago. • The life on the earth was reefs, sponges, corals, shelled organisms.

  5. Devonian • The Devonian period occurred 405 million years ago. • The first insects, spiders, and primitive plants began to appear.

  6. Mississippian period • The Mississippian period occurred 355 million years ago. • Crinoids ( sea lilies ) appeared. • Lush, terrestrial swamps covered the interior of the North American Continent.

  7. Permian • Permian began 299 million years ago. • The insects in the Permian were ancestors of cockroaches. • Large areas of North America was dry land.

  8. Triassic • The Triassic began 1.5 million years ago • The climate was dry and very hot. • During the Triassic, reptiles were dominant.

  9. Jurassic • The Jurassic began 199.6 million years ago • Several different types of dinosaurs began to appear. Such as the Tetanurae, Podokesaur, and the Stegosaur.

  10. Cretaceous • The Cretaceous started 146 to 65 million years ago. • Triceratops, Tyrannosaurus, Stegosaurus, Brontosaurus, and the Iguanodon lived during that time.

  11. Paleocene • The Paleocene started 55.8 million years ago • The Paleocene Epoch is recognized by the K.T. explosion of mass extinction.

  12. Pleistocene • The Pleistocene started 12,000 years ago • It covers most of the latest period of repeated glaciations. • The modern continents were essentially at there present position.

  13. Websites • www.answers.com • www.fossil-facts-and-finds.com • www.wikipedia.org

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