U.S. Geological Survey Professional Paper

Abrigo Formation Alluvium Arapahoe Arizona arkose beds Bibber Creek Bolsa brachiopods Broadway Alluvium calcareous calcilutite calcite Cambrian carbonate clay Claystone Clear Creek cobbles colluvium Colorado conglomerate contains coring Creek alluvium Cretaceous cross-laminated Dakota Denver Formation deposits dolomite east fault feet above base feet thick feldspar FIGURE fine-grained fossils Fox Hills Fox Hills Sandstone Golden quadrangle grains gravel gray Hitt Canyon horizon Lake laminated landslide Laramie Laramie Formation latite layers lime limestone localities Louviers Alluvium McKelligon medium-gray Meiklejohn Peak Mexico middle minerals montmorillonite mound Mountains loc mudstone North Table Mountain Ordovician outcrop overlain overlying Paso pelletoid percent Pierre Shale porosity Precambrian quartz Quartzite radiaxial calcite radiaxial fibrous calcite Ralston Creek Ralston dike region rocks samples sand sandy sedimentary silt siltstone silty soil stratigraphic surface Tempskya thin sections Tucker Gulch U.S. Geol unit upper Verdos Alluvium written commun zebra limestone zone