A large outcropping of rock made it impossible for a climber more than just a few feet below the edge, to see anyone above him.
The eastern elevation is a ridge or cuesta formed by an outcropping hard layer of the ancient coastal plain; and it separates the Wisconsin river basin from the Fox River Valley and the streams flowing into Lake Michigan.
In central Nebraska, outcropping again only in the Rocky Mountains.
Finally they descended into a low place in the ravine, momentarily putting an outcropping between them and the Indians who waited.
He dropped the camera and peered over the edge of the cliff but the outcropping blocked his view of anything below.