{ "currentVersion": 10.91, "cimVersion": "2.9.0", "id": 2589, "name": "GeologicUnits", "type": "Feature Layer", "description": "This GIS dataset is a reproduction of plate 1 (geologic map) of \u201cO\u2019Sullivan, Robert B., 1965,Geology of the Cedar Mesa\u2013Boundary Butte Area, San Juan County, Utah: U.S. Geological Survey Bulletin 1186, 128 p., 1 plate, scale 1:62,500.\u201d The GIS dataset was prepared by Lori Steadman, GIS Analyst with the Utah Geological Survey (UGS). Grant Willis, UGS Geologist, managed and reviewed the project and updated the stratigraphic nomenclature.The map covers the scenic San Juan River area of southeastern Utah from east of the town of Bluff to west of the town of Mexican Hat. The Monument Upwarp covers the western half of the map area; the Blanding Basin covers the eastern half. They are separated by the spectacular east-facing Comb Ridge monocline that forms a huge north-south topographic barrier between them. Both the upwarp and the basin are warped into smaller anticlines and synclines. The largest and most scenic is the Raplee anticline that is cut by a deep river canyon that is very popular for river float trips. The San Juan River cuts an ever-deepening canyon as it flows westward across the area. Goosenecks State Park is a popular viewpoint overlooking deeply entrenched meanders of the river\u2019s lower canyon. Grand Gulch Wilderness Study Area is in the northwestern part of the quadrangle and Monument Valley, the setting of many old western movies, is in the southwestern part. More than half the map area is on the Navajo Indian Reservation. Exposed strata ranges from the Pennsylvanian Paradox Formation exposed in the deepest canyons to the Upper Jurassic Brushy Basin Member of the Morrison Formation preserved as remnants on mesas in the northeastern part. Intrusions of mafic igneous rock, called minette, intruded as dikes, sills, plugs, and diatremes and weather out in relief as dark ribs and pinnacles that strikingly contrast with the red, tan, and gray sedimentary rock. The map area covers part of the Paradox Basin oil fields and hundreds of oil and gas exploration and development holes have been drilled. The map was created during the \u201curanium boom\u201d though the area did not prove productive even though it has extensive outcrops of the primary uranium-bearing formations. The map area is also famous for many well-preserved Ancestral Puebloan ruins. This dataset was produced as part of a UGS multi-decade effort to provide statewide GIS data to the public, federal, state and 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 issues such as a few slight modifications to fault and attitude placement and line attribute corrections. We changed some geologic line and point symbol attributes to better match the UGS 2019 data model. We also changed the names and labels of some formations and members to match 2019 nomenclature usage. While the map is considered a good representation of the geology of the map area, users should be aware that it was produced in 1965 and does not meet all modern cartographic, spatial control, or geologic standards. In particular, spatial placement of some contacts is poor compared to current base maps, and some contacts and correlations of the members of the Morrison Formation do not match those of current publications on the area.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.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 on the original map, but are not an exact match.ContactsOriginal attributes are \u201cContact \u2013 dashed where approximately located\u201d. These lines are now depicted as \u201cContact, well located\u201d or\u201cContact, dashed where approximately located\u201d.Unit Shown as Single LineThe map unit \u201climestone A of Honaker Trail or Halgaito Formation (PIPhta)\u201d is shown as a colored contact in steep areas where it is shown as a single line on the original map.Scratch or Gradational ContactIn an area on the northern part of the original map, the contact between two units is shown as just a color change without a line. It is not explained in the map legend but the text explains that it is a difficult-to-map gradational zone. We have shown it as a scratch contact.FaultsOriginal attributes are \u201cFault \u2013 dashed where approximately located; dotted where concealed, bar and ball on downthrown side\u201d. We use a normal fault designation for these faults even though we have not confirmed in the field that all of these faults are normal.Units \u2013 Descriptions/Names/AgesAs noted above, some units names have been changed to 2019 usage. Descriptions have not been changed.Drill HolesDrill holes are shown the same as on the original map and locations and names have not been verified or modified based on newer Division of Oil Gas and Mining records. Table 1 was copied directly from the original text; the text gives it a date of 1962 though the map publication date is 1965. Each drill hole is attributed with an identification number that links it to Table 1 and is shown on the map. 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