Parent Layer: Granite Mtn 7.5 OFR-681DM

Name: GraniteMtn_GeologicUnitLeaders

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Description: This GIS dataset is reproduced from “Hose, R.K., 1974, Geologic map of the Granite Mountain SW quadrangle, Juab and Millard Counties, Utah: U.S. Geological Survey Miscellaneous Investigations Series Map I-831, 1 plate, scale 1:24,000.” The map covers one standard 7.5′ quadrangle in west-central Utah. The GIS dataset was completed by Emilie Breitenstein and David Tomlinson, students at Brigham Young University, and final GIS review and preparation for public release were completed by Zach Anderson and Martha L. Jensen, GIS Analysts with the Utah Geological Survey (UGS).The UGS appreciates the volunteered time and effort of Brigham Young University students Emilie Breitenstein and David Tomlinson who produced the GIS data for this project under the guidance of Brigham Young University professor Eric Christiansen.The quadrangle is in the Basin and Range physiographic province of west-central Utah and is dominated by north-south-trending mountain ranges and broad valleys. The ranges expose Triassic through Devonian strata. The structure reflects the Sevier fold-thrust belt and subsequent extensional tectonics. Tertiary sedimentary and volcanic rocks partly conceal the older strata. The valleys are filled with thick basin-fill deposits of diverse origin.This dataset was produced as part of a UGS multi-decade effort to provide statewide 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 issues such as attributing faults and folds. We changed some geologic line symbols to better match the UGS 2018 data model. While the map is considered a good representation of the geology of the map area, users should be aware that it was produced in 1974 and does not meet all modern cartographic, spatial control, or geologic standards. Line attributes and symbology were selected from current (2018) 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, as noted below. ContactsOriginal attributes are “Contact – Dotted where concealed.”These lines are now depicted as “Contact, well located”; “Contact, approximately located"; or “Contact, concealed.”Unknown Faults Original attributes are “Fault – Dashed where poorly exposed or inferred; dotted where concealed. Bar and ball on downthrown side, queried where doubtful. Arrows show direction of relative movement.” These lines are now depicted as “Fault, unknown, well located”; “Fault, unknown, approximately located”; or “Fault, unknown, concealed.” These faults are symbolized as normal faults per the UGS schema to match the appearance of the original map.General faults“General faults” do not have a description in the explanation of the original map. These lines are now depicted as “Fault, unknown, well located”; “Fault, unknown, approximately located”; “Fault, unknown, approximately located, queried”; or “Fault, unknown, concealed.”Thrust FaultsOriginal attributes are “Low-angle fault – Dashed where poorly exposed or inferred; dotted where concealed. Sawteeth on upper plate.” These lines are now depicted as “Fault, thrust, well located”; “Fault, thrust, approximately located”;or “Fault, thrust, concealed” where older rocks are faulted over younger rocks.Detachment FaultsOriginal attributes are “Low-angle fault – Dashed where poorly exposed or inferred; dotted where concealed. Sawteeth on upper plate.” These lines are now depicted as “Fault, detachment, well located”; “Fault, detachment, approximately located”; or “Fault, detachment, concealed”where younger rocks are faulted over older rocks.AnticlineOriginal attributes are “Anticline – Showing approximate position of axial trace. Dotted where concealed.” These lines are now depicted as "Fold, anticline, upright, well located”; “Fold, anticline, upright, approximately located"; or“Fold, anticline, upright, concealed."Crest of minor anticlineOriginal attributes are “Crest of minor anticline – Dashed where approximate; dotted where concealed.” These lines are now depicted as "Fold, anticline, upright, well located”; “Fold, anticline, upright, approximately located”; “Fold, anticline, upright, concealed"; or the symbol “Fold, minor anticline.”SynclineOriginal attributes are “Syncline – Showing approximate position of axial trace; dotted where concealed.”These lines are now depicted as “Fold, syncline, upright, well located”;“Fold, syncline, upright, approximately located"; or “Fold, syncline, upright, concealed.” Trough of minor synclineOriginal attributes are “Trough of minor syncline – Dashed where approximate; dotted where concealed.” These lines are now depicted as “Fold, syncline, upright, well located”; “Fold, syncline, upright, approximately located"; or “Fold, syncline, upright, concealed”; or the symbol “Fold, minor syncline.”Units – Descriptions/Names/AgesMap is not modified from original source map even in locations where newer interpretations may exist.

Copyright Text: Program Manager: Grant C. Willis (UGS) Project Manager: Donald L. Clark (UGS) GIS and Cartography: Emilie Breitenstein (Brigham Young University), David Tomlinson (Brigham Young University), Martha L. Jensen (UGS), and Zach Anderson (UGS) Geology review: see original source document GIS review: Kent D. Brown (UGS)

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