Sandstone, shale, and conglomerate. In northwest and west-central: Lower Cretaceous. In southwest: Lower and Upper Cretaceous.
In northwest and west-central: Intertongues complexly with units of overlying Mesaverde Group or Fm; lower part consists of a calcareous Niobrara equivalent and Frontier Sandstone and Mowry Shale Members; in areas where the Frontier and Mowry Members (Kmfm), or these and the Dakota Sandstone (Kfd) are distinguished, map unit (Km) consists of shale above Frontier Member. In Southwest: Lower part contains Juana Lopez Member (Kmj)
Sandstone, shale, and coal; sandstone
Cliff House Sandstone
Summerville Fm: Shale and siltstone
Includes dune sand and silt and Peoria Loess
Morrison, Wanakah, and Entrada Fms
Red siltstone, shale, sandstone, and limestone-pellet conglomerate
Calcareous sandstone; a thin but persistent unit distinguished only locally
Includes Piney Creek Alluvium and younger deposits
Mainly intermediate to felsic compositions; some mafic
Variegated claystone, mudstone, sandstone, and local beds of limestone
Arkosic sandstone, siltstone, and conglomerate
Includes Broadway and Louviers Alluviums
Includes Slocum, Verdos, Rocky Flats, and Nussbaum Alluviums in east, and Florida, Bridgetimber, and Bayfield Gravels in southwest
In southwest, Glen Canyon Group consists of Navajo Sandstone, Kayenta Fm (red siltstone, shale, and sandstone) and Wingate Sandstone; Chinle is red siltstone
Locally includes talus, rock-glacier, and thick colluvial deposits
Transgressive marine sandstone.
Intermediate to felsic compositions
Mudstone, shale, and sandstone; coal-bearing.
Divided into Upper and Lower parts by Gallup Sandstone.
Regressive marine sandstone in McKinley and Sandoval Counties; the lower, Hosta Tongue, of Point Lookout is transgressive and is separated from main body by the Satan Tongue of Mancos Shale.
Mancos Shale, lower part
Morrison Formation (Brushy Basin and Salt Wash Members).
Includes Oak Canyon, Cubero, and Paguate Tongues; includes Clay Mesa Tongue of Mancos Shale.
Upper Jurassic nonmarine rocks.
Dakota Ss and Cedar Mtn or Burro Canyon Formations.
Alluvium and colluvium
Glen Canyon Group (Navajo Ss, Kayenta Fm, and Wingate Ss). Includes Rainbow Bridge.