Historic Resource Study, Crater Lake National Park, Oregon, 1984
V. Geological and Biological Information on Crater Lake Area
E. Points of Geological Interest in Crater Lake National Park
5. Devils Backbone
This is a vertical wall of dark andesite lining the cliff face and measuring about 1,000 feet long by 50 feet across near the top. A dike formed by molten lava that squeezed into cracks and then solidified, it has been left standing by the erosion of the surrounding material.