Alluvium and colluvium
Lake Bonneville deposits
Salt Lake Formation (?) and other Basin & Range valley-filling alluvial, lacustrine, and volcanic materials. Valley fill is more than 13,000 feet thick in the central part of Utah Valley.
In Northwestern Utah: Dacitic tuff (8.5 my). In Logan-Huntsville Allochthon: rhyolite.
Alluvial materials, Axtell and Harkers Formations
Laguna Springs Latite, Tintic Mountain Group (latite, porphyry & tuff), Packard Quartz Latite, and Apex Conglomerate.
Mud and salt flats
Isom Fm (tuff), Needles Range Fm (ash-flow tuff), Escalante Desert Fm (ash-flow tuff), Sawtooth Peak Fm (ash-flow tuff), and Tunnel Springs Tuff.
McCoy Creek and Sheeprock Groups (10,000+ feet thick).
Intrusions, chiefly granitic, of various dates.
Pilot Shale, Guilmette Formation, and Simonson and Sevy Dolomites.
Arapien Shale (Summerville Formation, Entrada Sandstone and Carmel Formation).
Notch Peak, Orr, Lamb, Weeks, and Wah Wah Summit Formations.
Ely Springs Dm, Eureka Qtz, Crystal Peak Dm, Watson Ranch Qzt, and the Pogonip Group (Lehman Formation, Kanosh Shale, Juab, Wah Wah, Fillmore, and House Limestones).
Oquirrh Group (maximum thickness 25,000 feet), including Bridal Veil Limestone.
North Horn Formation.
Great Blue Ls, Humbug Formation, and Deseret Limestone.
Trippe Ls, Marjum/Pierson Cove Fms, Wheeler Shale, Swasey Ls, Whirlwind Fm, Dome Ls, Chisholm Fm, Howell Fm, and Pioche Fm.
Duchesne River, Uinta and Bridger Formations
Prospect Mountain Quartzite (3,500 feet thick).
Green River Formation.
Gerster Limestone, Plympton Formation and Kaibab Limestone.
Price River Formation.
Maxfield Limestone (Opex Fm, Cole Canyon Dm, Bluebird Dm, Herkimer Ls, Dagmar Dm, and Teutonic Ls) and Ophir Formation.
Oquirrh Group (10,000+ feet thick) of Cedar Mountains and vicinity, is equivalent, in part to Arcturus Formation and Ely Limestone elsewhere
Silver City Monzonite (31 my), Sunrise Peak Monzonite Porphyry, Swanson Quartz Monzonite
Ochre Mountain Limestone (Great Blue equivalent) and Woodman Formation (Deseret Humbug equivalent).
Gardison Limestone and Fitchville Formation.
Ajax Dolomite and Opex Formation (upper member of Maxfield Limestone).
Pinyon Peak Limestone and Victoria Formation.
Diamond Creek Sandstone and Kirkman Limestone.
Precambrian rocks of the Canyon Range (Mutual Fm, Inkom Fm, Caddy Canyon Qtz, Papoose Creek Fm, Blackrock Canyon Ls, and upper part of Pocatello Fm).
Park City and Phosphoria Formations.
Salt Lake Formation and other Basin & Range valley-filling alluvial, lacustrine, and volcanic materials. Valley fill is more than 8,000 feet thick in places and includes salt masses under the Sevier Desert.
Fish Haven Dolomite and Opohonga Limestone.
Older alluvial deposits
Manning Canyon Shale.
In Western Utah: Quichapa Group and other volcanic rocks (Tmb,Tmr,Tma). In Central Utah: Silver Shield Latite (17 my) and Pinyon Creek Conglomerate.
Unit is present in all counties. Some counties divided the alluvium into younger and older units, and some did not. For those that did not, or used other generalized terms for Quaternary rocks, the unit Qal has been used for the general undivided alluvium. Additionally, when polygons have been edited and changed to alluvium, Qal was used as the general value; hence it now is present in all counties. Qya-Younger alluvium: Map unit is used in Churchill, Elko, Esmeralda, Eureka, Humboldt, Lander, and Lincoln Counties where geologic information suggests better-defined younger versus older alluvium. It is mostly interchangeable with Qal, except that it implies some specifically younger Quaternary deposits.
Includes generally cliff-forming, thin- to thick-bedded limestone. These rocks are mainly shallow water subtidal, intertidal, and supratidal deposits formed on a broad inner carbonate shelf (Stewart, 1980). The Devils Gate Limestone and Guilmette Formation in northern Nevada are the principal units, and the Sultan Limestone is included from the southern part of the State. Unit is overlain (usually disconformably) by the Pilot Shale of unit MDcl except in southernmost Nevada where it is overlain by Mississippian carbonate (Mc). It depositionally overlies Middle and Lower Devonian unit Dcd. In a few places, such as southern Nevada and parts of Eureka County, regional mapping did not distinguish the Upper and Middle Devonian section from the Lower Devonian section, and all of the Devonian is included in unit Dc. Rocks mapped as the Simonson Dolomite would fit into this depositional sequence (sequences 9 and 10 of Cook and Corboy, 2004), but they are not differentiated from the underlying dolomites in White Pine or Elko Counties, so they are all included in unit Dcd here, not unit Dc. This unit crops out in Clark, Elko, Eureka, Lander, Lincoln, Nye, and White Pine Counties.