Example 1

Date: Wednesday, October 12, 2022 - 17:48 PM

	Late Proterozoic	Paleozoic	Mesozoic	Cenozoic
Millions of Years Ago	650 - 550	550 - 250	250 - 75	27 - Present
Periods		Cambrian Ordovician Silurian Devonian Carboniferous Mississippian Pennsylvanian Permian	Triassic Jurassic Cretaceous	Tertiary Quaternary
Events	First Skeletal Elements First Animal Traces	First fish, amphibians, trees and reptiles Jawed fish diversity First major extinctions	First dinosaurs and mammals First birds and flowering plants Extinction of dinosaurs	Mammal diversity Evolution of humans
Key Species	Tetrapoda	Trilobites and Fish	Birds and Dinosaurs	Humans