Editing Montour County, Pennsylvania (section)

==Geology==
[[File:Susquehanna River in late March.JPG|thumb|Scenery of southern Montour County]]
[[File:View of northern Montour County, Pennsylvania.JPG|thumb|Scenery of northern Montour County]]
[[File:Montour Ridge.JPG|thumb|left|Montour Ridge in [[Liberty Township, Montour County, Pennsylvania|Liberty Township]]]]
Montour County is located in the [[Ridge-and-Valley Appalachians|Ridge-and-Valley Province]] of the [[Appalachian Mountains]]. A total of 65% of the soils in the county are [[drainage|well-drained]]. The [[Muncy Hills]] are located in the northern part of the county and Montour Ridge is located in the southern part of the county, not far from the Susquehanna River. Montour Ridge also is home to the highest elevation in the county, 1425 feet [[above sea level]]. The lowest elevation is 440 feet above sea level, at the Susquehanna River.<ref name = "soil survey">{{Citation |author=Joseph J. Eckenrode |url=https://books.google.com/books?id=gNhFAAAAYAAJ&dq=%22Montour+County%22+pennsylvania&pg=PA1 |title=Soil Survey of Montour County, Pennsylvania |year=1985 |access-date=July 15, 2013}}</ref>

The [[sedimentary rock]]s in Montour County are from either the [[Devonian Period]] or the [[Silurian Period]]. The Devonian Period rocks are more common than Silurian Period rocks, making up two thirds of the county. These rocks are prevalent in the Muncy Hills and the lowlands in the southern portion of the county. The Devonian Period rocks in Montour County include the [[Catskill Formation]], the [[Marcellus Shale]], the Helderburg Formation, the [[Mahantango Formation]], the [[Oriskany Formation]], the Marine Beds, and the [[Onondaga Formation]]. The other one third of the rocks in Montour County are from the Silurian Period. Rocks from this period are prevalent on Montour Ridge and the adjacent [[valley]] and the hills to the northwest of [[Washingtonville, Pennsylvania|Washingtonville]]. These areas consist of the Wills Creek formation, the Tonoloway Formation, the [[Bloomsburg, Pennsylvania|Bloomsburg]] Formation, the [[Tuscarora Formation]], the Clinton Group, and the McKenzie Formation.<ref name= "soil survey"/>

There are three major [[anticline]]s and [[syncline]]s in Montour County. These are the White Deer Anticline, the Lackawanna Syncline, and the Milton Anticline. These are located in the northern, central, and Montour Ridge areas of the county, respectively. These features are situated in a northeast–southwest alignment. They were formed by regional compression and uplift approximately 200&nbsp;million years ago, during the [[Permian Period]]. During the Pleistocene Period, the Illinoian [[glacier|glacial]] advance reached Montour County, although the Wisconsin glacial advance stopped slightly short of it. There are [[alluvial deposit]]s in many of the [[river valley]]s in the county, especially there two streams or rivers meet. These deposits were formed fairly recently, geologically speaking.<ref name = "soil survey"/>

The [[water supply]] for Montour County comes primarily from the Susquehanna River, as well as [[Water well|well]]s and [[Spring (hydrology)|springs]]. The rural areas especially depend on wells for their water supply, but Danville mostly uses the Susquehanna River. Wells drilled into Silurian rock have a tendency to be highly [[water hardness|hard]] and prone to developing [[sinkhole]]s. However, the Keyser, Wills Creek, and Tonoloway Formations are considerably better at producing water.<ref name ="soil survey"/>