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Search indexed USGS publications on groundwater, aquifers, geologic maps, mineral resources and earthquakes. Explore source records by subject and place.

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At least 73 records · Page 4Linked to original sources
USGS2006

Geologic map of the Colonial Beach South 7.5-minute quadrangle, Virginia

The Open-File Report includes a geologic map with cross section, and composite stratigraphic section of the Tertiary stratigraphy and of the Quaternary stratigraphy. The Tertiary map units are presented and interpreted for erodability and derived surficial deposits. The map area contains the George Washington Birthplace National Monument. The map facilitates the interpretation of the natural history of the Park including processes such as bog (wetlands) formation and coastal erosion. Two cores of Holocene estuarine deposits are sited on the map. They present the transition from terrestrial to estuarine depositional environments.

Open-File Report↗
USGS1990

Ground-water levels in Arkansas, Spring 1990

Groundwater level measurements were made in 553 wells in Arkansas in the spring of 1990. These data are listed in tables by aquifer; then by county. For each surface, the altitude of the land surface, the data measured, the depth to the water surface, and the altitude of the water surface are reported. Also reported are the net changes in water levels between 1989 and 1990 and between 1985 and 1990. This report also contains maps showing the average water level change, by county, between the years 1985 and 1990 for the aquifers in the Quaternary deposits and the Sparta and Memphis Sands. Hydrographs are included for selected wells completed in the aquifers in the Quaternary deposits and the Sparta and Memphis Sands. (USGS)

Open-File Report↗