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  2. The National Map - Wikipedia

    en.wikipedia.org/wiki/The_National_Map

    The National Map is part of the USGS National Geospatial Program. [3] The geographic information available includes orthoimagery (aerial photographs), elevation, geographic names, hydrography, boundaries, transportation, structures and land cover. The National Map is accessible via the Web, as products and services, and as downloadable data ...

  3. United States Geological Survey - Wikipedia

    en.wikipedia.org/wiki/United_States_Geological...

    Today's U.S. Topo quadrangle (1:24,000) maps are mass-produced, using automated and semiautomated processes, with cartographic content supplied from the National GIS Database. [33] In the two years from June 2009 to May 2011, the USGS produced nearly 40,000 maps, more than 80 maps per work day. [33]

  4. Geologic map - Wikipedia

    en.wikipedia.org/wiki/Geologic_map

    A geologic map or geological map is a special-purpose map made to show various geological features. Rock units or geologic strata are shown by color or symbols. Bedding planes and structural features such as faults , folds , are shown with strike and dip or trend and plunge symbols which give three-dimensional orientations features.

  5. United States Geological Survey Library - Wikipedia

    en.wikipedia.org/wiki/United_States_Geological...

    The USGS headquarters in Reston, VA. Today, the United States Geological Survey Library's users have access to over 1.7 million items: over 980,000 books and journals, over 600,000 maps, over 8,000 electronic media items (DVDs, CDs), and subscribes to over 113,000 electronic journal titles and eBooks.

  6. Old Port Formation - Wikipedia

    en.wikipedia.org/wiki/Old_Port_Formation

    Details of the type section and of stratigraphic nomenclature for this unit as used by the U.S. Geological Survey are available on-line at the National Geologic Map Database. [2] Current nomenclature usage by U.S. Geological Survey restricts the name Old Port Formation to Pennsylvania, but correlative units are present in adjacent states. [3]

  7. Geographic Names Information System - Wikipedia

    en.wikipedia.org/wiki/Geographic_Names...

    The logo of the United States Geological Survey (USGS) The Geographic Names Information System (GNIS) is a database of name and location information about more than two million physical and cultural features throughout the United States and its territories; the associated states of the Marshall Islands, Federated States of Micronesia, and Palau; and Antarctica.

  8. Dakota Formation - Wikipedia

    en.wikipedia.org/wiki/Dakota_Formation

    National Geologic Map Database. USGS : Charts West Shore Dakota unit from Arizona to Kansas border. See Ludvigson 2010 for completion of East Shore Dakota through to Minnesota. Robert G. Raynolds; James W. Hagadorn (2016). "Colorado Stratigraphic Chart". Colorado Geological Survey. Colorado School of Mines

  9. Chagrin Shale - Wikipedia

    en.wikipedia.org/wiki/Chagrin_Shale

    Details of the type locality and of stratigraphic nomenclature of the Chagrin Shale, as used by the U.S. Geological Survey, are available on-line at the National Geologic Map Database. [ 4 ] Description