(4) 7.2 Thinly bedded, x lam. silt, silt + slty shale with crude frogs, grading upward to fissile, gray silty shale with silt + sand lamine. At top is platy OB Fe cone layer 0.1 or less thick. Unit weathers to bedded beds. (5) 3.6. Continuation of bedded interval begun in unit 4. Chiefly slty silt with sand laminae tho sand predominates. Some Fe-stained frogs and OB cones - thin, platy, locally. At top some jayosite blobs. (6) 6.6-? Shale, dark brown gray becoming increasingly lentic upward. Some fine silt. Partially weathered so details obscured. Is first appreciable lentic shale in section i., arbitrarily base of Hell Creek fm. Contact with underlying interval is sharp and locally irregular. Top of Section # 2