A record of the geologic events and life forms in Earth's history.

a unit of geologic time into which eras are divided

states that younger layers of rock are deposited on top of older layers

An igneous rock layer formed when lava flows onto Earth's surface and hardens.

the largest division of geologic time

a distinct period of time, era, age

A break in the geologic record created when rock layers are eroded or when sediment is not deposited for a long period of time.

A supercontinent containing all of Earth's land that existed about 225 million years ago.

A term that typically describes a species that no longer has any known living individuals.

a long and distinct period of history with a particular feature or characteristic.

related to

An igneous rock layer formed when magma hardens beneath Earth's surface.

layers of sedimentary rock

A theory stating that the earth's surface is broken into plates that move.

The hypothesis that the continents slowly move across Earth's surface.