• Black Canyon of the Gunnison National Park

    Black Canyon Of The Gunnison

    National Park Colorado

6: Additional Resources

Geologic Time, Online Edition by William L. Newman

This USGS online publication provides a thorough introduction to relative verses, absolute dating and the developmental history of the geologic time scale.

Fossils, Rocks and Time, Lucy E. Edwards and John Pojeta, Jr.

In this USGS online publication, learn the important role that fossils play in shaping the geologic time scale.

Did You Know?

Rapids of Gunnison River

The Gunnison River through Black Canyon of the Gunnison National Park drops at an average of 95 feet per mile. By comparison, the Colorado River through Grand Canyon National Park drops an average of 7.5 feet per mile.