Abstract

The orientation of streams in the Geneva quadrangle, northwestern Pennsylvania, was studied in order to determine if their orientation has been influenced by fracture traces. Of the 151 visible fracture traces in the study area, 83% are oriented N30°W–N60°W or N30°E–N60°E. Measurement of over 2500 stream segments revealed that 43% of the segments are oriented 30–60° east or west of north, whereas random orientation of streams would result in only 33% of the segments having these trends. This preferred orientation is statistically highly significant (0.001 level). Contrary to expectations, the degree to which stream orientation was influenced by fracture traces does not appear to decrease with increasing drift thickness within the 0–500 ft (0–152 m) range present in the quadrangle.

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