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First shellfish and corals

cambrian

First land plants

silurian

First fish

ordovician

First insects

devonian

first reptiles

carboniferous

first dinosaurs

triassic

first mammals

triassic

first birds

jurassic

first flowering plants

cretaceous

first horses

eocene

first whales

eocene

first monkeys

eocene

first apes

oligocene

first hominids

miocene

first modern human

pleistocene

Origin of animal phyla, invasion of land (era)

paleozoic

age of reptiles, origin of angiosperms and birds (era)

mesozoic

age of mammals (era)

cenozoic

age of fish

devonian

Limestone fossils from Nashville come from this period

Ordovician

tetrapod origins

late devonian

Mammal like reptiles dominant in

late permian, early triassic

Most insect orders in place by the (era)

mesozoic

Mammals increase in diversity here (epoch)

paleocene, early eocene

extinction of the megafauna

pleistocene

Pangaea in

Triassic

Pangaea splits into Laurasia and Gondwanaland

Triassic, split in late Jurassic

Ediacaran fauna

precambrian

Burgess shale

cambrian

trilobites and ammonoids

silurian

1st true mammals

late triassic

move to land

devonian

mososaurs, plesiosaurs ichtyosaurs diversified at end of

triassic

ice ages occurred in the

pleistocene

Mammalian radiation

paleocene

All species of hominids coexisting in Kenya

pleistocene

origin of mitochondria (era)

Precambrian

transition from fish to amphibians (period)

Devonian

evolution of plants (ferns) with vascular tissues (era)

Paleozoic

Emergence of H. sapiens (period)

quaternary

First true mammals

triassic

diversification of the teleost fishes (era)

cenozoic

adaptive radiation of mammals (epoch)

paleocene

inland sea covers Nashville, resulting in formation of fossils (period)

ordovician

plesiosaurs roamed the sea (era)

mesozoic

formation of mitochondria

precambrian

highest diversity of life of earth (era)

cenozoic

Initial dominance of mammal like reptiles (period)

Permian

archaeopteryx

jurassic

most recent formation of a land bridge over the Bering Strait (epoch)

Pliocene

origin of archaebacteria (era)

precambrian

first true mammals (period)

triassic

time of peak placoderm diversity (period)

devonian

Great change in relative proportions of major taxa in plant communities (period)

cretaceous

transition from sarcopterygians to tetrapods (period)

devonian

events described by the endosymbiont hypothesis (era)

precambrian

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