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Southern California Areal Mapping Project

 

Geologic framework of the March Air Force Base Region, Riverside County

| Selected References |

Useful Geologic-information Resources

In cooperation with the U.S. Air Force , the Environmental Protection Agency , various State agencies, and the private sector, SCAMP conducted geologic-mapping and subsurface investigations in support of ground-water contamination issues on March Air Force Base. The primary goal of the geologic-mapping studies was to provide a three-dimensional geologic framework for evaluating regional ground-water flow patterns in the region. Such evaluations require an accurate portrayal of how various geologic materials are distributed geographically and in the subsurface, and of how geologic structures such as faults and folds disturb the geologic materials. When combined with geophysical and hydrogeologic information, the MAFB geologic-map data can be used to interpret such factors as the shape and volume of ground-water-bearing sedimentary basins and basin-recharge and basin-contamination pathways.

Findings

SCAMP investigations were presented to MAFB in several administrative and open-file reports (Morton, 1996a, b; Morton and Cox, 1996; Morton and Matti, 1996; Morton and others, 1997; Cox, 1997; Hillhouse and Cox, 1997) that included geologic maps of the Riverside East, Sunnymead, Perris, and Steele Peak 7.5' quadrangles. These reports can be examined at the March Air Force office or at the USGS office located in the Department of Earth Sciences at the University of California, Riverside. The studies provided information about the distribution and history of Cretaceous plutonic terranes, late Cenozoic sedimentary units of the San Timoteo Badlands, and Quaternary deformation patterns within the San Jacinto fault zone.

Specific findings include:

  • SCAMP investigations showed that subsurface basement topography in the vicinity of March AFB is considerably different than previously known. The SCAMP subsurface model resolves previous questions about transport of ground-water contaminants by showing that irregularities in subsurface topography guide ground-water flow;
  • We successfully subdivided the Quaternary alluvial succession for a part of the Perris block where Quaternary surficial materials previously had been generalized.

Recent SCAMP Products

Cox, B.F., 1997, Depth to basement map, March Air Force Base: U.S. Geological Survey, Administrative Report provided to March Air Force Base (for informal agency use only).

Hillhouse, J. and Cox, B., 1997, Magnetic stratigraphy of boreholes 6M2MW7 and 6M36MW8 at March Air Force Base, California: U.S. Geological Survey Open-File Report 97-862, 64 p.

Morton, D.M., 1996a, Digital geologic map of the Perris 7.5' quadrangle: U.S. Geological Survey, Administrative Report provided to March Air Force Base, scale 1:24,000 (for informal agency use only).

Morton, D.M., 1996b, Digital geologic map of the Steele Peak 7.5' quadrangle: U.S. Geological Survey, Administrative Report provided to March Air Force Base, scale 1:24,000 (for informal agency use only).

Morton, D.M., and Cox, B.F., 1996, Digital geologic map of the Riverside East 7.5' quadrangle: U.S. Geological Survey Administrative Report provided to March Air Force Base, scale 1:24,000 (for informal agency use only).

Morton, D.M., and Matti, J.C., 1996, Digital geologic map of the Sunnymead 7.5' quadrangle: U.S. Geological Survey, Administrative Report provided to March Air Force Base, scale 1:24,000 (for informal agency use only).

Morton, D.M., Cox, B.F., Matti, J.C., Jachens, R.C., and Hillhouse, J.H., 1997, Regional geology and structure in the area of March Air Force Base, California: U.S. Geological Survey, Administrative Report to March Air Force Base, 31 p., 9 maps, scale 1:24,000 (for informal agency use only).


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This site last updated September 3, 2004 (ps)

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