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Earth History 6+7

extends from Earth's origin to the beginning of human history geological time
based on the kinds of living organisms that existed during four very large chunks of time era
eras are divided into these smaller times that are based on evidence of major events that took place in Earth's crust periods
era between the beginning of Earth and the appearance of the first complex forms of life Precambrian era
the age of ancient life, which ended with the Great Extinction, during which 90% of the species living in the ocean disappeared Paleozoic era
the middle age of life, the time of the dinosaurs Mesozoic era
the age of recent life, during which mammals thrived Cenozoic era
a gap in the rock record; an interruption in the normal sequence of deposition of sedimentary rocks or between sedimentary rocks and other kinds of rocks unconformity
any evidence of past life fossils
Fossils which lived for a relatively short period of time and in many locations that are used to provide information about the age of rock layers index fossils
Created by: cbryner1