PARK HOME
PLAN YOUR VISIT
PHOTOS & MULTIMEDIA
HISTORY & CULTURE
NATURE & SCIENCE
Animals
Plants
Environmental Factors
Natural Features & Ecosystems
Fossils
Paleontology
Geologic Formations
Rattlesnake Assemblage
Mascall Assemblage
John Day Strata
Clarno Assemblage
Rivers and Streams
Soils
FOR TEACHERS
FOR KIDS
NEWS
MANAGEMENT
SUPPORT YOUR PARK
Site Index
Frequently Asked Questions
Bookstore
Contact Us
geologic formations includes:
The oldest layers are on the bottom, the youngest layers are on the top.
To learn more about each of these different Formations click on the highlights at the right hand side of the page.
Did You Know? Some of the earliest rhino fossils in the world were found in the John Day beds. We call these the "running rhinos".
Last Updated: January 13, 2007 at 18:23 EST