John Day Fossil Beds
Sheep Rock is part of the John Day Formation in the John Day Fossil Beds National Monument in Oregon. It is composed of rhyolitic volcanic ash erupted from the southern part of the Cascades 20 to 30 million years ago. Rhyolite occurs in shades of gray
Picture No
13626743
Media ID
43093150
Size
5119px x 3412px
(11.6MB)
Credit
James Steinberg /Science Source/ www.ardea.com
Category
NA
Availability
Available in UK only. No agents
Ardea Picture Library
Picture No
13626743
Contributor Ref
SCS-90075977
