| Term: | Pleistocene epoch |
| Definition: | The period from 2 500 000 to 10 000 years ago, during which continental glaciers periodically expanded to cover subpolar regions in both hemispheres. |
| Term: | Pleistocene epoch |
| Definition: | Period of time from about 2 million years ago to 10,000 years ago. During this period areas of land at higher and middle latitudes where covered with glacial ice. |