Time Scale and Fossil review

It is in the Precambrian time span.

It is in the Cambrian time span.

It is in the Cenozoic Era.

It is in the Mesozoic Era.

mass extinction

mass migration

mountain formation

volcanic eruption

epoch

era

period

year

A dead organism is eaten by scavengers and shredded.

A dead organism is slowly decomposed by bacteria and insects.

A dead organism is washed away in a flood and buried under rocks.

A dead organism is quickly buried under mud and sand.

geographically limited and existed for a geologically long period of time

geographically limited and existed for geologically short period of time

geographically widespread and existed for a geologically long period of time

geographically widespread and existed for a geologically short period of time