A photo of The Columbia River Gorge
By Geology and Ecology of National Parks
June 2011 (approx.)
Detailed Description
View of the Columbia River Gorge north of the Ginkgo Petrified Forest visitor center. The boulder in the foreground is a vesicular basalt (lava rock filled with gas bubbles that formed when the rock was still in a molten state).
Sources/Usage
A photo of The Columbia River Gorge