Geologic Time Scale Worksheet. Single celled organisms dominated most of earth s history. Archaean proterozoic and phanerozoic.
Illustrate and label two possible causes of mass extinction. Single celled organisms dominated most of earth s history. Discuss the difference between relative and absolute rock ages.
Explain the relationships among eons eras epochs and periods of the geologic time scale.
Geologic time scale is a timeline that organizes the events in earth s history like a calendar. Eons are divided into smaller units called eras. Eon largest division of geologic time era broad spans of time based on the general type of life existing during that time zoic animal life paleozoic ancient life mesozoic middle life dinosaurs cenozoic recent life mammals ends of eras are usually marked by a great extinction period shorter spans of time based on evidence of major disturbances in earth s crust and on the characteristics of the common rock formations epoch. Archaean proterozoic and phanerozoic.
