National Audubon Society: Field Guide to Rocks & Minerals Bears Ears Green & Yampa Rivers in

Green & Yampa Rivers in Dinosaur National Monument

ABSTRACT The drilling of seven core holes by the Utah Geological and Mineral Survey was done under contract with the United States Geological Survey

and drills

for example

Chock-full of detailed information

National Audubon Society: Field Guide to Rocks & Minerals Bears Ears Green & Yampa Rivers inBy: National Audubon Society This first all photographic field guide features 794 full color images of all the important rocks, gems, and minerals of North America, showing their many variations of color and crystal form. The text provides descriptions of 200 minerals (including 20 classified as gemstones) and 40 rocks, as well as descriptions of the natural environments where they occur. Photographically organized by color for quick and easy