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USGS is a primary source of geographic information system (GIS) data. Our data and information is presented in spatial and geographic formats, including The National Map, Earth Explorer, GloVIS, LandsatLook, and much more. Explore GIS Data Maps.

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January 1, 1990

Map showing free-air gravity anomalies off the western coast of Africa Senegal (south of 15° north latitude) to Sierra Leone Map showing free-air gravity anomalies off the western coast of Africa Senegal (south of 15° north latitude) to Sierra Leone

This map is one of six in a series presenting marine gravity data off the western coast of Africa (fig. 1). The data, collected by the U.S. Geological Survey (USGS) in 1987 in response to a request from the Defense Mapping Agency, are intended to improve gravity coverage where it has been insufficient or inadequate. The information shown on this and the other three maps that cover the...

January 1, 1990

Map showing free-air gravity anomalies off the western coast of Africa Western Sahara to Senegal (north of 15 north latitude) Map showing free-air gravity anomalies off the western coast of Africa Western Sahara to Senegal (north of 15 north latitude)

No abstract available.

January 1, 1990

Map showing geologic structures of the northern California continental margin Map showing geologic structures of the northern California continental margin

No abstract available.

January 1, 1990

Map showing mineral resource assessment for silver, cobalt, and base metals in Proterozoic sedimentary rocks and for iron, chromium, nickel, talc, chlorite, gold, and graphite in Archean crystalline rocks, Dillon 1° x 2° quadrangle, Idaho and Montana Map showing mineral resource assessment for silver, cobalt, and base metals in Proterozoic sedimentary rocks and for iron, chromium, nickel, talc, chlorite, gold, and graphite in Archean crystalline rocks, Dillon 1° x 2° quadrangle, Idaho and Montana

No abstract available.

Earth Resources Observation and Science (EROS) Center

January 1, 1990

Map showing the distribution of molybdenum in stream-sediment samples, Richfield 1° x 2° quadrangle, Utah Map showing the distribution of molybdenum in stream-sediment samples, Richfield 1° x 2° quadrangle, Utah

This map of the Richfield 1° x 2° quadrangle, Utah, shows the regional distribution of lead in the less-than-0.180-mm (minus-80-mesh) fraction of stream sediments. It is part of a folio of maps of the Richfield 1° x 2° quadrangle, Utah, prepared under the Conterminuous United States Mineral Assessment Program. Other published geochemical maps in this folio are listed in the references...

January 1, 1990

Map showing the distribution of molybdenum in stream-sediment samples, Richfield 1° x 2° quadrangle, Utah Map showing the distribution of molybdenum in stream-sediment samples, Richfield 1° x 2° quadrangle, Utah

This map of the Richfield 1° x 2° quadrangle, Utah, shows the regional distribution of molybdenum in the less-than-0.180-mm (minus-80-mesh) fraction of stream-sediments. It is part of a folio of maps of the Richfield 1° x 2° quadrangle, Utah, prepared under the Conterminuous United States Mineral Assessment Program. Other published geochemical maps in this folio are listed in the...