File:Junction fault 0112.jpg

Dividing fault between Appalachian Mountains and Allegheny Plateau

A major geologic fault (directly behind small trees) can be seen in a new roadcut about 10 miles north of Williamsport, Pennsylvania on new Route 15. The fault is just about at the line that divides the folded Appalachian Mountains and the merely uplifted dissected plateau of the Allegheny Plateau. On the left hand (south side) is metamorphic rock. On the right hand is sedimentary rock, which, as one continues northward becomes mostly horizontal.

Image copyleft: Image taken by me, released under GFDL, Pollinator 06:08, Dec 25, 2004 (UTC)

I'm not so sure those are metamorphic rocks on the left hand side of the photo. Been to the area and I thought they were sedimentary rocks.