Note 2: — THE NORTHERN ROCKIES
Reading edition
“The Devil’s Tower can be likened to nothing but itself. It is the core of a volcanic formation which doubtless once had a considerably larger circumference. At its base lies an immense talus of broken columns which the loosening frosts and the winter gales are constantly increasing; the process has been going on for untold thousands of years, during which the softer rock of the surrounding plains has been eroded to its present level.”2