page_title: Lycoming County, Pennsylvania
section_title: Appalachian Mountains and Allegheny Plateau
hierarchical_section_title: Lycoming County, Pennsylvania / Geography / Appalachian Mountains and Allegheny Plateau
caption_attribution_description: English: 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 en:Williamsport, Pennsylvania on new Route 15. The fault is just about at the line that divides the folded en:Appalachian Mountains and the merely uplifted en:dissected plateau of the en:Allegheny Plateau. On the left hand (south side) is metamorphic rock. On the right hand is en: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)
context_page_description: Lycoming County is a county located in the U.S. Commonwealth of Pennsylvania. As of the 2010 census, the population was 116,111. Its county seat is Williamsport.
  Lycoming County comprises the Williamsport, PA Metropolitan Statistical Area.
  Located about 130 miles northwest of Philadelphia and 165 miles east-northeast of Pittsburgh, Lycoming County is the largest county in Pennsylvania by area.
context_section_description: Lycoming County is divided between the Appalachian Mountains in the south, the dissected Allegheny Plateau (which also appears mountainous) in the north and east, and the valley of the West Branch Susquehanna River between these.
caption: Major fault at the dividing line between the Allegheny Plateau and the true Appalachian Mountains near Williamsport, Pennsylvania
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