Geology Reference
In-Depth Information
Lava bomb (airborne blob of lava) atop McCarthy Rim, looking north toward Mt. Washington, Mt. Jefferson, and
Mt. Hood [photo by Gary Tepfer].
Straightened and deepened by glacial activity, valleys now occupied by Horse Creek, Lightning Creek, and the
Imnaha River display multiple lava flows of the Columbia River basalts in their walls [photo by Gary Tepfer].
