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Crossbedding of the Potomac Formation in Fairfax County, Virginia

Open-File Report 76-193

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Abstract

Crossbedding in sandstone units is the most conspicuous sedimentary structure of the Potomac Formation in Fairfax County, Virginia. Most sets of crossbeds are a few feet thick and several feet wide and tens of feet long. Trough sets are dominant, but planar sets are also common. Dip directions of crossbeds show great variation, though westerly dips are sparse. The averages (resultant vectors) of crossbedding dip-directions measured at 33 localities do not show significant differences according to their geographic or stratigraphic distribution. The average dip-direction of the 292 crossbeds measured is N. 85? E. The data suggest that the depositional slope was easterly in Fairfax County throughout the time of deposition of the Potomac Formation. Major sand bodies, potential aquifers of the formation, are probably elongated along easterly trends.

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Crossbedding of the Potomac Formation in Fairfax County, Virginia
Series title:
Open-File Report
Series number:
76-193
Edition:
-
Year Published:
1976
Language:
ENGLISH
Publisher:
U.S. Geological Survey,
Description:
29 leaves :folded ill., folded col. map ;27 cm.; (28 p., 1 sheet, scale 1:48,000 - PGS)
Scale:
48000