EpochsEpochs

By: Anakin, Matthew, Vivian, MinaBy: Anakin, Matthew, Vivian, Mina

CambrianCambrian

• 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.

OrdovicianOrdovician

• 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.

SilurianSilurian

• The Silurian Epoch occurred 455 million years ago.

• The life on the earth was reefs, sponges, corals, shelled organisms.

DevonianDevonian

• The Devonian period occurred 405 million years ago.

• The first insects, spiders, and primitive plants began to appear.

Mississippian periodMississippian period

• The Mississippian period occurred 355 million years ago.

• Crinoids ( sea lilies ) appeared.

• Lush, terrestrial swamps covered the interior of the North American Continent.

PermianPermian

• Permian began 299 million years ago.

• The insects in the Permian were ancestors of cockroaches.

• Large areas of North America was dry land.

TriassicTriassic

• The Triassic began 1.5 million years ago

• The climate was dry and very hot.

• During the Triassic, reptiles were dominant.

JurassicJurassic

• The Jurassic began 199.6 million years ago

• Several different types of dinosaurs began to appear. Such as the Tetanurae, Podokesaur, and the Stegosaur.

CretaceousCretaceous

• The Cretaceous started 146 to 65 million years ago.

• Triceratops, Tyrannosaurus, Stegosaurus, Brontosaurus, and the Iguanodon lived during that time.

PaleocenePaleocene

• The Paleocene started 55.8 million years ago

• The Paleocene Epoch is recognized by the K.T. explosion of mass extinction.

PleistocenePleistocene

• 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.

WebsitesWebsites

• www.answers.com

• www.fossil-facts-and-finds.com

• www.wikipedia.org