Parent Layer: DirtyD FrenchS HappyC HorseshoeWSA OFR-711DR

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Description: This GIS dataset is reproduced from Dubiel, R.F., Bromfield, C.S., Larson, M.J., Patterson, C.G., and Peterson, Fred, 1985, Geologic map of the Dirty Devil, French Spring-Happy Canyon, and Horseshoe Canyon Wilderness Study Areas, Wayne and Garfield Counties, Utah: U.S. Geological Survey Miscellaneous Field Studies Map MF-1754-B, 1 plate, scale 1:50,000. The map is compiled for use at 1:50,000 scale. The map depicts geologic formations, faults, bedding attitudes, folds, and other information, and is accompanied by explanatory information including correlation of map units, description of map units, structure discussion, references, and map symbols.This map covers a large tract of the southern San Rafael Desert area of south-central Utah. It extends from approximately Utah highways 24 and 95 east to near the Green and Colorado Rivers, and from the Wayne-Emery county line south into northern Garfield County. It includes a large part of the northern arm of Glen Canyon National Recreation Area in the northern Orange Cliffs area. It includes most of the Dirty Devil River and its tributaries. Prominent features include the Dirty Devil River and its canyons, Robbers Roost Canyon and Flats, Horseshoe Canyon, French Springs, Happy Canyon, the northern Orange Cliffs, and the Burr Desert. Exposed strata range from the upper part of the Upper Triassic Chinle Formation to the Middle Jurassic Entrada Sandstone. Overall, strata dip westward on the lower west flank of the Monument uplift. Locally, they are gently warped into smaller folds and cut by a few small-displacement normal faults. Much of the landscape is stark redrock desert with extensive exposed bedrock. Tributaries of the Dirty Devil River are deeply incised into the terrain. Large pediments mantled with mostly igneous rocks extend from the Henry Mountains into the western part of the map area west of the river. Most roads and trails are on broad benches with old calcic “hardpan” soils (caliche). Eolian sand and silt mantle most of these older surfaces. This dataset was produced as part of a Utah Geological Survey (UGS) multi-decade effort to provide statewide intermediate-scale (approximately 1:50,000 to 1:100,000) GIS data to the public, federal to local government agencies, educational groups, exploration and development companies, and other map users. The GIS dataset reproduces the original source map as close as reasonably possible; however, some geologic decisions were made to resolve cartographic problems such as inconsistent faults and incomplete polygons. We changed some geologic line symbols to better match newer mapping in the area and the UGS 2019 data model. While the map is considered a good representation of the geology of the map area, users should be aware that it was released in 1985 and does not meet all modern cartographic, spatial control, or geologic standards.This map was compiled by the authors from published and unpublished sources. Some features were field verified, but it still should be considered a reconnaissance-type map. Comparison with current georectified orthophotographic imagery showed that spatial accuracy ranges from fairly accurate (generally within 10 to 20 meters) to very poor (some lines misplaced by more than 100 meters). The UGS did not attempt to improve the spatial fit of any features.Not all features on the original map precisely match options in the 2019 UGS geologic map schema as noted below. Line attributes and symbols were selected from current (2019) UGS schema and do not necessarily match the intent of the original map. Selected attributes most closely represent the general geologic interpretation depicted by the original map but are not an exact match.Normal FaultsThese lines are now depicted as normal faults and unknown faults. Downthrown side is shown with bar and ball symbol.Anticlines and SynclinesThese lines are now depicted as approximately located or concealed where they are covered with Quaternary deposits.Units – Unit Symbols/NamesWhile we did not attempt to improve or change geologic map contacts or features, we did change some map unit labels to formation and member names preferred by most current workers in the area as explained in the GIS map metadata. On this map we replaced Page Sandstone with Temple Cap Formation following Doelling, H.H., Sprinkel, D.A., Kowallis, B.J., and Kuehne, P.A., 2013, Temple Cap and Carmel Formations in the Henry Mountains Basin, Wayne and Garfield Counties, Utah, In Morris, T.H., and Ressetar, R., editors, The San Rafael Swell and Henry Mountains Basin—geologic centerpiece of Utah: Utah Geological Association Publication 42, p. 279–318, appendices.

Copyright Text: Program Manager: Grant C. Willis (UGS) Project Manager: Grant C. Willis (UGS) GIS and Cartography: Basia Matyjasik (UGS) Geology review: see original source document GIS review: Kent D. Brown (UGS) Funding: Utah Geological Survey

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