-
cambrian 1.9 mya (1927)
Most of the major animals begin to appear. Marine life is abundant. -
ordovician 488.7 mya - 433.7 (1938)
Best known for its abundance of marine life. Most of the worlds land waqs collected in the super continent Gondwana. -
Silurian 443.7 mya -416.0 mya (1945)
Coral reefs made there first appearrences. Evolution of fishes occured. First known fresh water fish. Life on land is being discovered such as relatives of spiders and centipedes. -
Devonian 395M\345M
Armored fish go extinct, earliest amphibians and ammonites appear. -
Carniferous 345M-280M
Abundant sharks and amphibians. Coal forming forsests. Earliest reptiles and scale trees. -
Permian 280M-225M
Many marine animals gone extinct. -
Triassic 225M-195M
Earliest dinosaurs. Certain plants are beginning tobappear. (Cycads & conifers) -
Jurassic 195M-136M
Earliest birds and mammals. Dinosaurs and amenities are abundant. -
Cretaceous 195M-136M
Earliest flowering plants. Climax of dinosaurs followed by there extinction. And a great decline of brachiopods. Abundant of bony fish. -
Tertiary 65M-1.8M
Earliest placental mammals, modern mammals & large running mammals. -
Quaternary 1.8M-present
Large carnivores Neanderthals, humans & mastodons
