Description:
This dataset is based on the Geologic Map of North America (scale 1:2500000, Reed et al., 2005) from DDS 424 (Garrity and Soller, 2009) and the Sherrod et al. (2007) compilation of Hawaii (scale 1:100000). The dataset is distributed as the USA USGIN 3M Geology Web Map Service (WMS) by the Arizona Geological Survey for inclusion with One Geology. Data were prepared by clipping data from Garrity and Soller (2009) to the boundaries of the United States including the offshore exclusive economic zone, as defined by NOAA (http://coastalmap.marine.usgs.gov/GISdata/basemaps/boundaries/eez/NOAA/useez_noaa.htm). US Pacific Island territories are not included. Data for Hawaii were acquired from Sherrod et al. (2007), and units were reclassified to better match the granularity of the Reed et al. (2005) map, and boundaries between reclassified units were dissolved to simplify the map. Offshore data around Hawaii were not found that could be included in the compilation. Data from Garrity and Soller (2009) and the Sherrod et al. (2007) generalization were merged into a single database using the NCGMP09 data structure (USGS NCGMP, 2010). Representative lithology and age properties were associated with each map unit. These property values are specified using CGI vocabularies for rock type (CGI Simple Lithology, http://resource.geosciml.org/Vocab2011html/SimpleLithology201012.html) and stratigraphic age (International Stratigraphic Chart, 2009-08, http://resource.geosciml.org/ISC2009/CGI2011TimeScale.rdf). Finer-scale granularity on some polygon-level representative lithology and age assignments than that presented in the Reed et al. (2005) mapping using the state geologic map compilation by the USGS Mineral Resources Division (e.g. Ludington et al., 2007). Data were exported from the NCGMP09 database into database tables conforming to the CGI GeoSciML Portrayal schema, and web services are deployed using these tables as the data source. Spatial data from Garrity and Soller (2009) has been reprojected into WGS 1984 decimal degrees. The Web map service view of the data presents three portrayals, based on representative age, representative lithology and lithostratigraphy. The representative age portrayal uses the color scheme presented on the International Stratigraphic Chart, 2009-08 (pdf cached at http://resource.geosciml.org/ISC2009/ISChart2009.pdf). RGB and CMYK colors for this legend were imported from OneGeology Europe color scheme (Asch et al., 2009, accessed at http://onegeology-europe.brgm.fr/how_to201002/OneGeologyWP3-DataSpec_Portrayal_v%201%205KA.doc, Table 1-1). The color scheme for the representative lithology portrayal was updated from a scheme developed by the GeoSciML workgroup (thanks to Eric Boisvert, GSC) using URN identifiers; the colors in that scheme were “creatively adapted from Moyer,Hasting and Raines (2005, http://pubs.usgs.gov/of/2005/1314/of2005-1314.pdf) which provides xls spreadsheets for various color schemes. Most of the colors come from lithclass 6.1 and 6.2 (see http://www.nadm-geo.org/dmdt/pdf/lithclass61.pdf for lithclass 6.1)”. The lithostratigraphic scheme was created from the map legend included with Garrity and Soller (2009) by removing overlay patterns because they are incompatible with OGC Styled Layer Description (SLD) of map symbolization, and adjusting colors to preserve distinction between map units defined by Reed et al. (2005). Portrayal of the contact and fault themes use conventional geologic map symbolization. Additional feature classes that can not be mapped into the GeoSciML Portrayal scheme are included on the Reed et al. (2005) map and were digitized by Garrity and Soller (2009). These features are not currently exposed via web services. The additional features were clipped to the extent of the US geology polygons, and have been included in the NCGMP09-format geodatabase distribution of this dataset. Miscellaneous geologic line features including special submarine features, calderas, glaciation extent, impact structure outlines from Reed et al. (2005) were digitized by Garrity and Soller (2009) into a variety of feature classes. These were merged into a single otherLines feature class in the NCGMP09 version of the dataset. FeatureType terms correspond to the names of the original feature classes or feature types within the original feature classes if there were multiple kinds of features. Miscellaneous geologic point features including diapirs, mineral occurrences, gas seeps, hydrothermal vents, unusual igneous rock occurrences, volcanic vents from Reed et al. (2005) were digitized by Garrity and Soller (2009) into a variety of feature classes. These were merged into a single geoPointFeature feature class as an extension to the NCGMP09 model in this dataset. FeatureType terms correspond to the names of the original feature classes or feature types within the original feature classes if there were multiple kinds of features. Miscellaneous geologic overlay polygons that delineate areas of metamorphism, continental deposits, zones of abundant diapirs, and offshore outcrops (?) from Reed et al. (2005) were digitized by Garrity and Soller (2009) into multiple feature classes. These were merged back into a single OverlayPoly feature class of the NCGMP09 model. FeatureType terms correspond to the names of the original feature classes or feature types within the original feature classes if there were multiple kinds of features. References Garrity, C.P., and Soller, D.R., 2009, Database of the Geologic Map of North America- Adapted from the Map by J.C. Reed, Jr. and others (2005):, U. S. Geological Survey USGS Data Series DS-DS424, 1 CDROM. 2009 Sherrod, D. R., Sinton, J. M., Watkins, S. E., and Brunt, K. M., 2007, Geologic Map of the State of Hawai’I: Reston, VA, U. S. Geological Survey Open-File Report 2007-1089, resolution variable. Reed Jr., J. C., Wheeler, J.O., and Tucholke, J.E., 2005, Geologic Map of North America: Geological Society of America, DNAG Continent-Scale Map 001, Scale: 1:5,000,000, 3 sheets. USGS National Cooperative Geologic Mapping Program (NCGMP), 2010, NCGMP09-Draft Standard Format for Digital Publication of Geologic Maps, Version 1.1: in Soller, D.R. Editor, Digital Mapping Techniques ’09—Workshop Proceedings: USGS Open-File Report 2010-1335, p. 93-147. (accessed at http://pubs.usgs.gov/of/2010/1335/pdf/usgs_of2010-1335_NCGMP09.pdf 2012-01-25) Ludington, Steve, Moring, B.C., Miller, R.J., Stone, P.A., Bookstrom, A.A., Bedford, D.R., Evans, J.G., Haxel, G.A., Nutt, C. J., Flyn, K.S., and Hopkins, M.J., 2007, Preliminary integrated geologic map databases for the United States--Western States: California, Nevada, Arizona, Washington, Oregon, Idaho, and Utah, Version 1.3, updated December 2007: U. S. Geological Survey Open-file Report 2005-1305, accessed online at http://pubs.usgs.gov/of/2005/1305/ (2011-11-08).
