John Day Fossil Beds / Rust Colored Hills
Return to Main Menu Previous Home Next

Rust Colored Hills

Natural processes transformed the ash into bentonite, a type of clay that expands as it absorbs water. When drying, the clay con- tracts, leaving the numerous small cracks that give the hills a "popcorn-like" appearance. The warm colors are from iron oxides, similar to those of ordinary rust.

09-Rust Colored Hills