By Geological Interval

The study of paleontology can be broken down in a number of ways. One way to study past life is to examine specific intervals of the earth's past. This category is for any website that deals with the study of these intervals.

Sub-Categories:

Arizona Sedimentary Project Image Gallery - A set of pictures of fossils organized by time interval.
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Web Geological Time Machine - a great, sprawling geological and paleontological journey from the birth of the planet to today.
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