Editing Sullivan County, Pennsylvania (section)

==Geology==
Sullivan County lies predominantly within the [[Appalachian Plateau]] [[United States physiographic region|physiographic province]], which is characterized by gently [[Fold (geology)|folded]] and [[Fault (geology)|faulted]] [[sedimentary rock]]s of middle to late [[Paleozoic]] age. The southern border of the county is approximately at the [[Allegheny Front]], a geological boundary between the [[Ridge-and-Valley Appalachians|Ridge and Valley]] province and the plateau. ([https://web.archive.org/web/20011116133635/http://www.dcnr.state.pa.us/topogeo/maps/map13.pdf PA Geologic Survey Map 13]). The mountains within the county are part of the [[Endless Mountains]].
[[File:Worlds End State Park Far View.jpg|left|thumb|alt=A view of a forest-covered mountain valley with a creek in it, under a partly cloudy sky|[[Worlds End State Park]]]]
The [[Stratigraphy|stratigraphic record]] of sedimentary rocks within the county spans from the [[Devonian]] [[Lock Haven Formation]] (exposed only in Lick Creek valley) to the coal-bearing [[Pennsylvanian (geology)|Pennsylvanian]] [[Allegheny Formation]]. Generally, the [[Catskill Formation]] underlies most of the lowlands, and sandstones of the [[Huntley Mountain Formation|Huntley Mountain]], [[Pocono Formation|Burgoon]], [[Mauch Chunk Formation|Mauch Chunk]], or [[Pottsville Formation]]s cap the mountains. No [[igneous rock|igneous]] or [[metamorphic rock|metamorphic]] rocks exist within the county, other than possible [[glacial erratic]]s.

[[Structural Geology|Structurally]], the bedrock of Sullivan County is gently [[Fold (geology)|folded]], with the axes of two major [[anticline]]s (including the Wilmot Anticline) and two major [[syncline]]s (Bernice-Mehoopany Syncline and Noxen Syncline) each trending roughly east–west. There are three mapped [[Fault (geology)|faults]] in the Allegheny Formation between the towns of Murray and Ringdale.<ref>PA Geologic Survey Map 61, Overton Quadrangle</ref><ref>Berg, T.M., Edmunds, W.E., Geyer, A.R. and others, compilers, (1980). Geologic Map of Pennsylvania: Pennsylvania Geologic Survey, Map 1, scale 1:250,000.</ref>

Nearly all of Sullivan County was [[glacier|glaciated]] several times in the past, during the [[Pleistocene]] epoch, or "Ice Age." ([https://web.archive.org/web/20011116140157/http://www.dcnr.state.pa.us/topogeo/maps/map59.pdf PA Geologic Survey Map 59]). Most of the county is covered by glacial [[till]] of Late [[Last glacial period|Wisconsinan]] age. Late [[Illinoian (stage)|Illinoian Stage]] deposits may underlie the Late Wisconsinan deposits, and these are exposed in the south central part of the county (roughly western Davidson Township).

The major rivers in Sullivan County are [[Loyalsock Creek]] and [[Muncy Creek]]. Both flow into the [[West Branch Susquehanna River|West Branch of the Susquehanna River]]. Some streams along the eastern border of the county flow into the North Branch of the [[Susquehanna River]]. All of Sullivan county is thus within the [[Chesapeake Bay]] Watershed.

Several small [[coal]] fields exist within Sullivan County.<ref>[https://web.archive.org/web/20000918074050/http://www.dcnr.state.pa.us/topogeo/maps/map11.pdf Article title] PA Geologic Survey Map 11</ref> The fields contain either [[bituminous]] or [[Anthracite|semi-anthracite]] coal, and all occur within [[Pennsylvanian (geology)|Pennsylvanian]] strata.
[[Image:Haystacks1 Loyalsock Creek Sullivan Co PA.jpg|thumb|right|The Haystacks in Loyalsock Creek]]
Notable geologic features within Sullivan County include some of the following:
* The Haystacks ([[Huntley Mountain Formation]]), exposed along [[Loyalsock Creek]] south of [[Dushore, Pennsylvania|Dushore]], are [[sandstone]] mounds of unknown origin
* [[Ganoga Lake]] is the state's highest lake at 2265&nbsp;ft above sea level
* [[Ricketts Glen State Park]], with its many waterfalls
* [[Worlds End State Park]], including an exposure of the [[Huntley Mountain Formation]], and a "rock city" where [[cross-bedding]] is visible in the sandstone of the [[Pottsville Formation]]
* The Leberfinger [[Quarry]] (on Millview Mountain Rd northeast of [[Forksville, Pennsylvania|Forksville]]), in the [[Lock Haven Formation]] where [[brachiopod]] [[fossil]]s, [[Ichnology|trace fossils]], and plant fossils can be observed<ref>The Haystacks, "Ricketts Folly," and The End of the World: Geology of the Glaciated Allegheny High Plateau, Sullivan, Luzerne, and Columbia Counties, Pennsylvania, 71st Annual Field Conference of Pennsylvania Geologists (field trip guide book), J. D. Inners, G. M. Fleeger, eds., 2006</ref>
* Grand View, located at the southeast corner of the county on a knob of Red Rock Mountain, provides scenic views of the [[Allegheny Front]]
[[File:Ticklish Rock.jpg|thumb|upright|Ticklish Rock, at ground level]]
* [[Ticklish Rock]], located near Glen Mawr up Rock Run Road, features a rock formation of the [[Devonian]] [[Catskill Formation]].

===Mountains===
{| class="wikitable" style="align center"
|'''Name'''||'''Height'''
|-
|[[North Mountain (Pennsylvania)|North Mountain]]
|2,584 ft (788 meters)
|-
|Huckleberry Mountain || {{convert|2,496|ft|m|abbr=in|sp=us}}
|-
|Roundtop || {{convert|2,484|ft|m|abbr=in|sp=us}}
|-
|Prospect Hill || {{convert|2,140|ft|m|abbr=in|sp=us}}
|-
|Tomkins Corners Vista || {{convert|2,110|ft|m|abbr=in|sp=us}}
|-
|High Knob || {{convert|2,025|ft|m|abbr=in|sp=us}}
|-
|Bear Mountain || {{convert|1,995|ft|m|abbr=in|sp=us}}
|-
|Lovers Rock || {{convert|1,995|ft|m|abbr=in|sp=us}}
|-
|Gooseberry Hill || {{convert|1,940|ft|m|abbr=in|sp=us}}
|-
|Middle Hill || {{convert|1,927|ft|m|abbr=in|sp=us}}
|-
|Camp Mountain || {{convert|1,920|ft|m|abbr=in|sp=us}}
|-
|Hogback Hill || {{convert|1,923|ft|m|abbr=in|sp=us}}
|-
|Pole Hill || {{convert|1,917|ft|m|abbr=in|sp=us}}
|-
|Big Hill || {{convert|1,897|ft|m|abbr=in|sp=us}}
|-
|Browns Vista || {{convert|1,819|ft|m|abbr=in|sp=us}}
|-
|Lambert Hill || 1,743 (532 meters)
|-
|Warburton Hill || {{convert|1,743|ft|m|abbr=in|sp=us}}
|-
|Molyneux Hill || {{convert|1,740|ft|m|abbr=in|sp=us}}
|-
|Wright Hill || {{convert|1,717|ft|m|abbr=in|sp=us}}
|-
|Shrimp Hill || {{convert|1,661|ft|m|abbr=in|sp=us}}
|}