| Term: | Quaternary period |
| Definition: |
The last two million years of geologic time, comprising the Pleistocene and Holocene glacial epochs. Estimates of the date of the beginning of the Quaternary vary between 2.5 and 1.6 million years ago. AMSglossary
GCW |
| Term: | Quaternary period |
| Definition: | The last two million years of geologic time, comprising the Pleistocene and Holocene glacial epochs. Estimates of the date of the beginning of the Quaternary vary between 2.5 and 1.6 million years ago. |
| Term: | Quaternary period |
| Definition: |