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Cambrian Period. 570-500 MYA.
Earliest marine life recorded Abundant amount of Triallbites. -
Ordovician. 500-435 MYA.
Red and green algae. Mostly underwater. -
Silurian. 435-335 MYA.
Climate change that brought to the earth, called the greenhouse effect. -
Devonian. 395-345 MYA.
Plant growth. Ferns, horsetails, and seedplants appeared. -
Carboniferous. 345-280 MYA.
During the Carboniferous Period, it was part of a vast equatorial coastal swamp extending many hundreds of miles and barely rising above sea level. -
Permian. 280-225 MYA.
During the Permian, the continents joined to form a single supercontinent, Pangea. Hot, dry conditions prevailed almost everywhere, and deserts were widespread. Marine invertebrates evolved into several lineages. -
Triassic. 225-195 MYA.
Many new vertebrates emerged during the Triassic. The seas became inhabited by large marine reptiles. -
Jurassic. 195-136 MYA.
Dinosaurs. Mammals started to fly. Big ones were herbivores. Smaller were carnivores. -
Cretaceous. 136-65 MYA.
In the seas, marine invertebrates flourished, and bony fishes evolved. On land, flowering plants arose, and insects, bees in particular, began their thriving partnership with them. -
Tertiary. 65-1.8 MYA.
The Tertiary has five subdivisions: Paleocene, Eocene, Oligocene, Miocene, and Pliocene epochs. During most of the Tertiary the spatial distribution of the major continents was largely similar to that of today. -
Quaternary. 1.8-Present.
The Quaternary follows the Tertiary Period.The Quaternary is subdivided into the Pleistocene Epoch and the Holocene Epoch and is characterized by major cyclical changes of climate on a global scale. These led to repeated invasions of vast areas by ice sheets.
