Quarternary Period (NEOGENE)
1.8 mya-present This period continues today and includes all modern form of life.
Tertiary Period (PALEOGENE)
65-1.8 mya Mammals, flowering plants, grasslands, insects, fish, and birds diversified. Primates evolved.
145-65 mya Dinasour populations peaked and then went extinct. Birds survived to radiate in the Tertiary period. Flowering plants arose.
213-145 mya Dinosaurs diversified, as did early trees that are common today. Oceans were full of fish and squid. First birds arose.
248-213 mya Following the largest mass extinction to date, dinosaurs evolved, as did plants such as ferns and cycads. Mammals and flying reptiles (pterosaurs) arose.
248-213 mya Modern pine trees first appeared, and Pangaea supercontinent was formed as major landmasses joined together.
360-286 mya Coal-forming sediments were laid down in vast swamps. Fish continued to diversify. Life forms included amphibians, winged insects, early conifers, and small reptiles.
410-360 mya Fish diversified. First sharks, amphibians, and insects appeared. First trees and forest arose.
440-410 mya Earliest land plants arose. Melting of glaciers allowed seas to form. Jawless and freshwater fishes evolved.
505-440 mya Diverse marine invertebrates evolved, as did the earliest vertebrates. Massive glaciers formed, causing sea levels to drop and a mass extinction of marine life to occur.
544-505 mya All existing animal phyla developed over a relatively short period of time know as the Cambrian Explosion.