BULL. GEOL. SOC. AM. 



VOL. 23, 1911, PL. 40 



Figure 1. — Flat Top of Swiftcurrext Ridge, a IIk.mxaxt of the Blackfoot Penk- 



TLAIX, CAri'KD WITH PRE-\yi.SCOXSIX GLACIAL DRIFT 



Looking north westwai-d to Yellow Mountain in background, Appekunny Mountain at 



left, and Chief Mountain at right 



Fi(;ri!E 2. — Mesa of "Kexnedy Gravel," probahly pre-Wiscg-vrix glacial Drift, 5 



Miles east of Chief Mouxtaix 



(Photo by Bailey Willis) 



PRE-WISCONSIN GLACIAL MATERIAL IN MONTANA 



