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    "description" : "This report, 'Karst in the United States of America: A digital map compilation and database', describes new digital maps delineating areas of the United States, including Puerto Rico and the U.S. Virgin Islands with potential for karst and pseudokarst development. These maps show areas underlain by soluble rocks and also by volcanic rocks, sedimentary deposits, and permafrost with potential for karst or pseudokarst development. All 50 States contain areas with potential for karst development. About 18% of the area of the United States is underlain by karst or soluble rocks with the potential for development of karst features. The areas of soluble rocks shown are primarily based on selection from state geologic maps of rock units containing significant amounts of carbonate or evaporite minerals. Areas underlain by soluble rocks are further classified by general climate setting, induration, and exposure. Areas with potential for volcanic pseudokarst are those underlain by chiefly basaltic flow rocks no older than Miocene in age. Areas with potential for pseudokarst features in sedimentary rocks are of relatively unconsolidated units that pseudokarst features, such as piping caves, have been reported from. Areas with potential for development of thermokarst features, mapped exclusively in Alaska, contain permafrost mantled by various thicknesses of overlying sediment. This report includes a GIS database with links from the map unit polygons to online geologic unit descriptions. This report is an interim product with revisions and additions planned for a future formal publication and print edition.",
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    "copyrightText" : "The data for this map were compiled and edited by David J. Weary and Daniel H. Doctor of the U.S. Geological Survey. Most of the spatial data compiled in this project originated as lithologic map units on geologic maps produced by various state geological surveys. Versions of the original source maps are available for purchase or download from the respective state geological surveys. Much of the digital map data for this project was compiled from a series of integrated geologic map databases for the United States produced by the United States Geological Survey (USGS) Mineral Resources Program, National Surveys and Analysis (NSA) Project (see: http://mrdata.usgs.gov/geology/state/, accessed 02/10/2014). Use of the USGS digital geologic data provided a consistent data structure within which a derivative database of areas with potential for karst could be constructed. In some areas, other miscellaneous datasets and publications were referenced to facilitate accurate map compilation. These references are cited in the COMMENTS field of the feature data.",
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