DEEPTIME

Deep time

Deep time is the concept of geologic time. The modern philosophical concept was developed in the 18th century by Scottish geologist James Hutton . Modern science has since established, after a long and complex history of developments, the age of the Earth at around 4.54 billion years.

The above text is a snippet from Wikipedia: Deep time
and as such is available under the Creative Commons Attribution/Share-Alike License.

Need help with a clue?
Try your search in the crossword dictionary!