| Abstract: | Field investigations in the Williamsport Valley identify lineaments found on Landsat III images, have shown the presence of six discrete fault zones that strike subparallel to the trend of the Appalachian folds. These zones range from 0.5 to 1.75 km in width and from at least 10 km to more than 50 km in length. The individual thrust faults within each zone occur in ‘staircase-type‘ folds and are at a low angle to bedding. Although each individual fault may have 0nly centimeters to displacement, many of these individual faults appear to exist within the six zones. We believe that the stress that produced that Valley and Ridge folds to the south was largely dissipated in faulting in the Williamsport Valley. This dissipation of the stress would explain the presence of only broad open folds to the north on the Allegheny Plateau. The extreme faulting in the Williamsport Valley along with the unique ‘staircase‘ and ‘reverse staircase‘ structures may result in fracture porosity traps at depth. |
| Genre: | USGS Numbered Series |
| ProdID: | 10716 |
| Citation Author: | Pohn, Howard A.; Purdy, Terri L. |
| Citation Contributing Office: | |
| Citation Datum: | |
| Citation Day: | |
| Citation Edition: | - |
| Citation Editor: | |
| Citation End Page: | |
| Citation Issue: | |
| Citation Keywords: | |
| Citation Language: | ENGLISH |
| Citation Larger Work Title: | |
| Citation LatN: | |
| Citation LatS: | |
| Citation LonE: | |
| Citation LonW: | |
| Citation Month: | |
| Citation No Pagination: | |
| Citation Number Of Pages: | |
| Citation Online Only Flag: | |
| Citation Phsyical Description: | 16 p. :ill., maps ;28 cm. |
| Citation Projection: | |
| Citation Public Comments: | |
| Citation Publisher: | U.S. Geological Survey, |
| Citation Series: | Open-File Report |
| Citation Series Code: | OFR |
| Citation Series Number: | 79-1604 |
| Citation Search Results Text: | Thrust fault zones in the Allegheny Plateau of north-central Pennsylvania; 1979; OFR; 79-1604; Pohn, Howard A.; Purdy, Terri L. |
| Citation Start Page: | |
| Citation Volume: | |
| Citation Year: | 1979 |
| Type: | citation/reference |
| Text: | Thrust fault zones in the Allegheny Plateau of north-central Pennsylvania; 1979; OFR; 79-1604; Pohn, Howard A.; Purdy, Terri L. |
| URL (THUMBNAIL): | http://pubs.usgs.gov/of/1979/1604/report-thumb.jpg |
| URL (DOCUMENT): | http://pubs.usgs.gov/of/1979/1604/report.pdf |
| Date Other: | Sat, 1 Jan 1994 00:00 -0600 |
| Publisher: | U.S. Geological Survey, |
