Earth's Eras

Era

Period

• Epoch, Start, million years ago

Cenozoic Era

Flowering Plants, Grasses, Insects, Fishes, Birds, Mammals

Quaternary

• Holocene 0.01
• Pleistocene 1.7
• Tertiary
• Pliocene 5
• Miocene 23
• Oligocene 34
• Eocene 55
• Paleocene 65

Mesozoic Era

Reptiles, Dinosaurs

Cretaceous

• Late Cretac. 95
• Early Cretac. 135
• Jurassic
• Malm 160
• Dogger 185
• Lias 205
• Triassic
• Keuper 230
• Muscheltalk 245
• Buntsandstein 250

Paleozoic Era

first Land Plants, Fishes, Amphibians, Insects

The end of the Permian marks the biggest extinction of all time.

Permian

• Late Permian 270
• Early Permian 290
• Carboniferous
• Pennsylvanian 325
• Mississippian 355
• Devonian
• Late D. 375
• Middle D. 390
• Early D. 410
• Silurian
• Late Silurian 420
• Early Silurian 435
• Ordovician
• Late O. 450
• Middle O. 470
• Early O. 480
• Cambrian
• Late C. 490
• Middle C. 510
• Early C. 540

Precambrian Era

Bacteria, Eucaryotic Cells

Proterozoic

• Neoprot. 1000
• Mesoprot. 1600
• Paleoprot. 2500
• Archaean
• Neoarch. 2800
• Mesoarch. 3200
• Paleoarch. 3600
• Eoarch. 3800
• Azoikum 4600

http://en.wikipedia.org/wiki/Geologic_time_scale#Table_of_geologic_time