| 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. |
| Genre: | USGS Numbered Series |
| ProdID: | 16478 |
| Citation Author: | Weir, Gordon Whitney |
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| Citation Language: | ENGLISH |
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| Citation Phsyical Description: | 29 leaves :folded ill., folded col. map ;27 cm.; (28 p., 1 sheet, scale 1:48,000 - PGS) |
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| Citation Publisher: | U.S. Geological Survey, |
| Citation Series: | Open-File Report |
| Citation Series Code: | OFR |
| Citation Series Number: | 76-193 |
| Citation Search Results Text: | Crossbedding of the Potomac Formation in Fairfax County, Virginia; 1976; OFR; 76-193; Weir, Gordon Whitney |
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| Citation Year: | 1976 |
| Type: | citation/reference |
| Text: | Crossbedding of the Potomac Formation in Fairfax County, Virginia; 1976; OFR; 76-193; Weir, Gordon Whitney |
| URL (THUMBNAIL): | http://pubs.usgs.gov/of/1976/0193/report-thumb.jpg |
| URL (DOCUMENT): | http://pubs.usgs.gov/of/1976/0193/report.pdf |
| URL (PLATE): | http://pubs.usgs.gov/of/1976/0193/plate-1.pdf |
| Date Other: | Sat, 1 Jan 1994 00:00 -0600 |
| Publisher: | U.S. Geological Survey, |
