During Bull Lake time, the North Fork John Day ice extended west onto the Trout Meadows quadrangle, and dammed drainages to form glacial lakes at Crane Flats and along Trail Creek. The routes of both Trail and Crane Creeks were diverted. Bull Lake ice extended north along the upper Grande Ronde River approximately 3 km onto the Limber Jim quadrangle. Pinedale ice apparently moved only a few kilometers west from the Elkhorn crest, entering the Crawfish Lake quadrangle in the drainages of the Grande Ronde River, Crawfish Creek, the North Fork John Day River, and Baldy Creek. These short valley glaciers probably did not merge.
Pinedale drift is characterized by grayish tan sandy soils with fresh clasts.
Eric Bilderback of Colorado College studied the evidence for ice originating in the Anthony Lakes cirque complex and advancing north and east down Anthony and Antone Creeks. Antone Creek ice deposited Bull Lake and Pinedale drifts which are well exposed on the road between North Powder and Anthony Lakes. Whit Morriss of Washington and Lee University investigated the former glaciers which moved eastward from the north end of the Elkhorn crest. The valley glaciers along Dutch Flat Creek and the North Fork Powder River turned north as they crossed the range front. Emily Geraghty of Whitman College synthesized existing knowledge of glaciation of the entire Elkhorn Range, and made a reconnaissance investigation of every valley.