This is the basic unit of geologic time. A Period lasts tens of millions of years, which is the time it takes to form one type of rock system.
« Back to Glossary IndexGeologic Time Periods
All about the features and processes of the Earth's surface.
This is the basic unit of geologic time. A Period lasts tens of millions of years, which is the time it takes to form one type of rock system.
« Back to Glossary Index