Description: The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States (https://doi.org/10.5066/F7WH2N65) represents a seamless, spatial database of 48 State geologic maps that range from 1:50,000 to 1:1,000,000 scale. A national digital geologic map database is essential in interpreting other datasets that support numerous types of national-scale studies and assessments, such as those that provide geochemistry, remote sensing, or geophysical data. The SGMC is a compilation of the individual U.S. Geological Survey releases of the Preliminary Integrated Geologic Map Databases for the United States. The SGMC geodatabase also contains updated data for seven States and seven entirely new State geologic maps that have been added since the preliminary databases were published. Numerous errors have been corrected and enhancements added to the preliminary datasets using thorough quality assurance/quality control procedures. The SGMC is not a truly integrated geologic map database because geologic units have not been reconciled across State boundaries. However, the geologic data contained in each State geologic map have been standardized to allow spatial analyses of lithology, age, and stratigraphy at a national scale. A full discussion of the procedures and methodology used to create this dataset is available in the accompanying report: Horton, J.D., San Juan, C.A., and Stoeser, D.B, 2017, The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States (ver. 1.1, August 2017): U.S. Geological Survey Data Series 1052, 46 p., https://doi.org/10.3133/ds1052.
Service Item Id: 452dd65f147b4fd5872bff6d6b7a217b
Copyright Text: The State Geologic Map Compilation of the Conterminous United States was developed by the U.S. Geological Survey Mineral Resources Program (MRP). The project owes its success to numerous MRP staff who compiled the Preliminary Integrated Geologic Map Databases for the United States (PIGMD) as well as the foundational geologic mapping work completed by U.S. State Geologic Surveys and academia.
Description: Faults in the northern Gulf of Mexico. Digitized from Diegel et al, 1995, Figure 2. Due to error inherent in digitizing the map, the exact shape and precise position of faults may not be fully accurate. This is particularly true of seaward-dipping faults near the coastline or salt bodies, where salt, faults, and boundaries are difficult to distinguish on the map.
Service Item Id: 452dd65f147b4fd5872bff6d6b7a217b
Copyright Text: Diegel, F.A., Schuster, D.C., Karlo, J.F., Shoup, F.C., Tauvers, P.R. 1995. Cenozoic Structural Evolution and Tectono-STratigraphic Framework of the Northern Gulf Coast Continental Margin. in M.P.A. Jackson, D.G. Roberts, and S. Snelson, eds., Salt tectonics: a global perspective: AAPG Memoir 65, p. 109-151. Figure 2. Digitized by C. Disenhof 09/2015.
Description: This line shapefile represents the major fault lines in the United States. A fault is a fracture or fracture zone in the Earth's crust along which rocks on one side have moved significantly with respect to those on the other side. This layer is part of the Geologic Map of the United States, originally published at a scale of 1:2,500,000 (King and Beikman, 1974b). It excludes Alaska and Hawaii. These data depict the geology of the bedrock that lies at or near the land surface, but not the distribution of surficial materials such as soils, alluvium, and glacial deposits. This is a revised version of the April 2004 data set. This map complements the Generalized Geologic Map of Alaska, Hawaii, Puerto Rico, and the U.S. Virgin Islands by Reed and Bush. This layer is part of the 1997-2014 edition National Atlas of the United States.
Service Item Id: 452dd65f147b4fd5872bff6d6b7a217b
Copyright Text: National Atlas of the United States. (2005). Fault Lines: Geology of the Conterminous United States, 2005. National Atlas of the United States. Available at: http://purl.stanford.edu/tt369vk9000.