Geology and Paleontology

Geological features within the preserve reveal a nearly continuous record of the floral, faunal, and tectonic history of east-central Alaska. The geology of the region also reveals fossil-bearing rock and sedimentary deposits that help scientists to track changes in the earth millions of years ago.

Aerial view of Calico Bluff and the Yukon River

NPS/Josh Spice


Geologic Processes

Movement along the Tintina Fault, of of the great fault systems in western North America, revealed the gold deposits that ignited the famous Klondike Gold Rush.


The preserve contains an uninterrupted sequence of fossil-bearing sedimentary rocks and some of the oldest known microfossils in existence have been found in this area.

Sedimentary Record

Sediments in bluffs along the Yukon River span some 700,000 years and displays the evolution of this river system through multiple glacial episodes.

Research and Education

The preserve provides opportunities to study geological and paleontological evidence of changing climate, landscapes, and ecosystems.


Last updated: July 30, 2020

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Contact Info

Mailing Address:

101 Dunkel St
Suite 110

Fairbanks, AK 99701



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