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Earth's History

Geologic Time

TermDefinition
fossil the preserved remains or traces of a once-living organism found in rock
geologic time the long history of Earth, divided into different time periods based on major changes in life and the planet
Precambrian the earliest and longest part of Earth’s history, when the first simple cells (prokaryotes) appeared; 4,600–541 MYA
Paleozoic the era when many early life forms developed, including fish, insects, and the first land plants and animals; 541–252 MYA
Mesozoic the era known as the “Age of Dinosaurs,” when dinosaurs lived and reptiles were common; 252–66 MYA
Cenozoic the era we live in today, known as the “Age of Mammals,” when mammals became the dominant life forms on Earth; 66 MYA–Present
Created by: bcroy
 

 



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