Geological Survey Professional Paper 132—A Rock Formations in the Colorado Plateau of Southeastern Utah and Northern Arizona

McELMO FORMATION (CRETACEOUS?).

The McElmo formation, of Cretaceous (?) age, is exposed near Bluff, where it consists of gray, red, and green shale and thin beds of sandstone with two heavy conglomeratic layers, making an incomplete section several hundred feet thick. At places these conglomerates contain carnotite deposits. Along the Colorado below the San Juan partial sections of the formation are made up chiefly of a massive cliff-making greenish-gray sandstone, in part conglomeratic. In western Kane County the McElmo appears to be represented by a coarse conglomerate of undetermined thickness.