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Definition: A great deal of life was present and then an explosion happened and caused a mass extinction.

Time Period: 542 - 251 MYA

Organisms: Corals & Glossopterids

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Definition: The Cambrian period was the first geological period of the Paleozoic Era. It was the time when most of the major groups of animals first appear in the fossil record.

Time Period: 541 - 485 MYA

Organisms: Vetulicolia & Metaspriggina

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Definition: Some seas deposited widespread blankets of sediment that persevered the extraordinary abundant fossil remains of marine animals. The Ordovician Period was the second geological period of Paleozoic Era.

Time Period: 485 - 443 MYA

Organisms: Endoceras & Asteriacites

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Definition: In the oceans, there was a widespread radiation of crinoids, a continued proliferation and expansion of the brachiopods, and the oldest known fossils of coral reefs.

Time Period: 443 - 419 MYA

Organisms: Corals & Conodonts

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Definition: Late in this period the first four legged amphibians appeared, indicating the colonization of land by vertebrates.

Time Period: 419 - 358 MYA

Organisms: Murrindalaspis & Stachyophyton

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Definition: During this period was dense and had swampy forests which made large deposits of heat over the years heat transformed into  rich coal.

Time Period: 358 - 298 MYA

Organisms: Dragonflies & Labyrinthodontia

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Definition: This period is the most devastating incidence of mass extinction in Earth's history. This was the end of the Permian Period.

Time Period: 298 - 251 MYA

Organisms: Archosauriformes & Synapsid

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Definition: This period is also called the age of reptiles and the age of conifers.

Time Period: 251 - 66 MYA

Organisms: Dinosaurs & Modern plants

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Definition: Life that survived the so called Great Dying repopulated the planet, diversified into freshly exposed ecological niches, and gave rise to new creatures, including rodent sized mammals and the first dinosaurs.

Time Period: 251 - 201 MYA

Organisms: Myosaurus & Cartorhynchus

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Definition: This period was a warm, wet climate that gave rise to a great amount of life.

Time Period: 201 - 145 MYA

Organisms: Dinosaurs & Ichthyosaurs

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Definition: During this period it had a warm climate, resulting in high ecstatic sea levels that created numerous shallow inland seas. These oceans were full of marine reptiles.

Time period: 145 - 66 MYA

Organisms: Tyrannosaurus & Mexichelys

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Definition: The extinction of the dinosaurs and the rise of mankind.

Time Period: 66 - 0 MYA

Organisms: Cave lions & Woolly mammoths

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Definition: This is the time in which mammals evolved from relatively small, simple forms into large group of diverse animals.

Time Period: 66 - 23 MYA

Organisms: Palaeosaniwa & Acherontisuchus

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Definition: Marine and terrestrial fossils found in the strata of this time were more closely related to each other.

Time Period: 23 - 2 MYA

Organisms: Early humans & Cave bears.

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Definition: The extinction of many species of large mammals and birds, and the spread of humans.

Time period: 2 MYA

Organisms: Humans & Rhinoceros