Darton Cloverly formation: - (G.S.A. Bull. v. 15, p. 394-401) No details - Mentions only SS (Avi?o bot 10-60) coarse, buff-gray, xbedded, and overlying "clay", 30-40. Some thin deposits of coal near base of sandstones. Lupton, L.T., 1916 (U.S.G.S. Bull. 621, pp 167-168.) Greybull SS - (A subsurface unit, no type section.) Lupton says it is upper 20 feet of Dartons type Cloverly D.F. Howitt & L.T. Lupton 1917 (USGS Bull 656, p. 19) [See this for type of Morrison - p.19 ref to Knowlton Fisher] Cloverly "in pieces unconformably overlies the Morrison" Average th. in BHB = 125' Furmost pieces its lower part is fine white clay or clay SS, 15-25 ft th. middle part is reddish sandy shale and thin b. SS 75'+6. top is 10-20 ft. yellowish gray SS - "locally termed Greybull sand, and here designated the Greybull SS member of the Cloverly fm., from town of Greybull near which it is typically exposed. [this makes it a legal surface unit, not a subsurface as Wilworth has it.] They note Morrison "gastroliths" from near top of fm. also cretaceous leaves near Tensleep. So probably confusion of contact here also. G.W. Washburne. 1908 USGS Bull 340, p. 35-0 Describes "rusky beds" as basal member of the Colorado fm. Says "...constant feature at base marking Cretaceous" "Seemingly they are as a group a true (bss) sandstone