Then Moses heard the people weep throughout their families, every man in the door of his tent: and the anger of the LORD was kindled greatly; Moses also was displeased.
Moses heard the people of every family wailing at the entrance to their tents. The LORD became exceedingly angry, and Moses was troubled.
The mountain is composed of Shuksan greenschist, oceanic basalt that was metamorphosed when the Easton terrane collided with the west coast of North America, approximately 120 million years ago. The mountain is an eroded remnant of a thrust plate formed by the Easton collision.