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Geo-Mysteries Geologic Timeline

Geo Mysteries with Rex the Dino Detective

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Dive into the depths of time with our Geologic Timeline. The farther you scroll down, the farther back in time you'll travel. And the longer a period is on this page, the longer it lasted in history!

Era Period Million years ago

Cenozoic

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cenozoic

Holocene 0.01 Million years ago—Present 0.01
Pleistocene 2—0.01 Million years ago
Mastodon click to enlarge		 2
Pliocene 5—2 Million years ago
Pelecypod Pelecypod click to enlarge		 5

Miocene 25—5 Million years ago
Giant shark tooth

Giant Shark Tooth

25 Million years ago

Oligocene 38—25 Million years ago
Oreodont

Oreodont
click to enlarge

 38 Million years ago
Eocene 55—38 Million years ago
Green river fish (81.65.4)		 55 Million years ago
Paleocene 65—55 Million years ago 65 Million years ago
Era Period Million years ago

Mesozoic

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Mesozoic

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Mesozoic

Cretaceous 144—65 Million years ago
Edmontosaur toe bone

Edmontosaur Toe Bone

 144 Million years ago

Jurassic 213—144 Million years ago
Diplodocus cranium

Diplodocus Cranium

 213 Million years ago
Triassic 248—213 Million years ago
Coelophysis (91.75.1) 		248 Million years ago

Era Period Million years ago

Paleozoic

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Paleozoic

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Paleozoic

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Paleozoic

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Paleozoic

Permian 286—248 Million years ago
Early reptile cranium

Early Reptile Cranium

 286 Million years ago

Carboniferous

 

 

 

 

 

 

 

 

 

 

 

 

 

Carboniferous

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Carboniferous

Pennsylvanian 323—286 Million years ago
Fern fossil

Fern Fossils

 360 Million years ago

Mississippian 360—323 Million years ago
Large crinoid

Large Crinoid

Borden Sea Floor—Discover the animals that lived there!

Devonian 408—360 Million years ago
Brachiopod

Brachiopod


408 Million years ago

Silurian 440—408 Million years ago

 440 Million years ago

Ordovician 505—440 Million years ago
Complex trilobite

Complex Trilobite


Horn Coral

Horn coral

505 Million years ago

Cambrian 590—505 Million years ago
Early trilobite

Early Trilobite

 

590 Million years ago

Era Period Million years ago
Precambrian

Precambrian 630 Million years ago to 4.6 billion years ago

 

 

At this scale you would have to scroll down 46 more feet to go back to the formation of the earth.

 Over 630 Million years ago

© The Children's Museum of Indianapolis, 2000