proterozoicsimple multicelular sea creatures develop, algae and plankton develop, eukayotic cells develop (2,500,000,000)
Paleozoic-permian: modern insects; reptiles spread; evergreens; extinction of trilobites ( on year 299,000,000
- pennsylvanian: giant insects; first reptiles (318,100,00)
-mississippian: first amphibians; freshwater fish; wingless insects(359,200,00)
- devonian: land colonized by arthropods and plants(443,700,00)
-silurian: land conolized by athropods and plants (443,700,000)
-ordovivian: trilobites abundant; vertebrates increase (488,300,000)
-cambrian: sudeen explosion of life; (542,000,000
Phanerozoic; cenozoicquatenary: recent (holocene}9 epoch pleistocene Epoch
tetiary: piocene Epoch
- eocene Epoch
End of last ice age, rise of human civilization.
The Pleistocene Epoch is typically defined as the time period that began about 2.6 million years ago and lasted until about 11,700 years ago.
cretaceous: mass extinctions (including dinosaurs); flowering plants appear
Jurassic: giant dinosaurs; early birds; first mammals
Triassic: first dinosaurs; rise of mammal-like reptiles