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These polygons are a graphic summary of information about the rock units in the State of Arkansas at the time of the map compilation (1993). The scale (1:500,000) forces an exaggeration of the outcrop width of the thinner map units; therefore, rock units older than shown may be present in small outliers. The differences in tectonic features, lithologic boundaries, geographic extent of the rock units, and stratigraphic nomenclature between the 1929 version of the Geologic Map of Arkansas and these polygons are based on published and unpublished geologic reports prepared since 1929 and on detailed and reconnaissance mapping done in conjuction with the preparation of these polygons. |
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These polygons are a graphic summary of information about the rock units in the State of Arkansas at the time of the map compilation (1993). The scale (1:500,000) forces an exaggeration of the outcrop width of the thinner map units; therefore, rock units older than shown may be present in small outliers. The differences in tectonic features, lithologic boundaries, geographic extent of the rock units, and stratigraphic nomenclature between the 1929 version of the Geologic Map of Arkansas and these polygons are based on published and unpublished geologic reports prepared since 1929 and on detailed and reconnaissance mapping done in conjuction with the preparation of these polygons. |
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State Geologic Map Compilation (SGMC) activity of the National Surveys and Analysis projects of the US Geological Survey Mineral Resources Program. |
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This open-file report presents the results of the USGS Mineral Resources Program activity to compile a national-scale geologic map database to support national and regional level projects, including mineral resource and geo-environmental assessments. The only comprehensive sources of regional- and national-scale geologic maps are state geologic maps with scales ranging from 1:100,000 to 1:1,000,000. Digital versions of these state maps form the core of what is presented here. Because no adequate geologic map exists for the state of Alaska, it is being compiled in regional blocks that also form part of this national database. It is expected that this series will completed by approximately the end of 2007. These maps and databases are being released in blocks of states or, in the case of Alaska, as compiled blocks of 1:250,000-scale quadrangles as chapters in this series. For Alaska, formal maps as well as databases are being published here, whereas for the conterminous U.S. only state databases and preview graphics are presented, because published maps for most states already exist. For Alaska these regional compilations will form the base for compiling a new geologic map of the state. As documented in Chapter A, standards for the conterminous U.S. are somewhat different than those for Alaska and Hawaii. |
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This database is not meant to be used or displayed at any scale other than 1:500,000. Any hardcopies utilizing these data sets shall clearly indicate their source. If the licensee has modified the data in any way they are obligated to describe the types of modifications they have performed on the hardcopy map. Licensee specifically agrees not to misrepresent these data sets, nor to imply that changes they made were approved by the U.S. Geological Survey. |
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Preliminary Integrated Geologic Map (polygon) |
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["geology","ouachita mountains","USA","ozarks","stratigraphy","lithology","3110 - ESRI","3100 - Vector","geoscientific Information","1101 - General","rock units","gulf coastal plain","US05 = Arkansas","3112 - export","arkansas","1100 - Geology","arkansas river valley","geologic formations","geology","Arkansas"] |
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en-US |
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