Geologic Time Review

Front

What is an unconformity?

Back

A gap in the geologic record where rock layers are missing.

Front

What is the purpose of the geologic time scale?

Back

To organize and sequence events in the history of Earth and to serve as a model for a vast amount of time covered.

Front

What was the Paleozoic era known as?

Back

The age of fish.

Front

What was the Mesozoic era known as?

Back

The age of reptiles.

Front

What was the Cenozoic era known as?

Back

The age of humans.

Front

What is the largest division of time on the geologic time scale?

Back

Eon.

Front

What formed in the atmosphere that allowed life to evolve on land?

Back

Ozone layer.

Front

What is a fault in geology?

Back

A fracture in the Earth's crust along which movement has occurred.

Front

What is an intrusion in geology?

Back

Magma that has cooled and solidified within the Earth's crust.

Front

What is an extrusion in geology?

Back

Lava that has erupted onto the Earth's surface and solidified.