As I said, this section was quite interesting as it shows the upheaval of the thrust that occurred way back. SHEPARD FORMATION. Several hundred feet of limy beds which weather yellow-brown lie on top of the Siyeh. Although named for outcrops on the cliff above Shepard Glacier (south of Stoney Indian Pass and near the site of the old Fifty-Mountain tent camp) the formation is exposed on the summit of Swiftcurrent Mountain at the head of Swift current Valley.