T. Code 1959 Faleo peregrinus 4 June Peters-Schweder Lakes - At a point on "Butte" ca. about 6 mi NW of Schweder L, in the upper edge of the foothills province, a ♀ with 4 eggs was found on a shale bluff, facing westw. A pair of roughlegs was also on the same series of bluffs about 300 yards upstream. The travel did not put in an appearance while we were there - for ca. 20 min. Avie observed by binoculars only. Avie site 50 ft up from river & 50 below bank on a pilepile of shale. Located on a mound of loose shale chips which had accumulated on a ledge of the bluff, from sliding above. Mound about 2 ft high and ca 4 ft diam at base. Flat surface on top where nest, located about 18" diameter (estimated from companion with length of bird when she was pushed on the nest). Site could easily be destroyed by further sliding from above but otherwise the location is invulnerable except by rope. Altitude from map with 100 ft contours appears to be about 2200 ft.