Sidneys Knob appears to be an atypical

mountain A mountain is an elevated portion of the Earth's crust, generally with steep sides that show significant exposed bedrock. Although definitions vary, a mountain may differ from a plateau in having a limited Summit (topography), summit area, and ...

for Pennsylvania when viewed from the northeast. Most of the mountains in the

Commonwealth A commonwealth is a traditional English term for a political community founded for the common good. Historically, it has been synonymous with "republic". The noun "commonwealth", meaning "public welfare, general good or advantage", dates from the ...

are long linear ridges or flatted topped

plateau In geology and physical geography, a plateau (; ; ), also called a high plain or a tableland, is an area of a highland consisting of flat terrain that is raised sharply above the surrounding area on at least one side. Often one or more sides ha ...

mountains. Sidneys Knob is part of a bifurcated ridgeline as seen in the topographic map below.''Burnt Cabins, PA'', 7.5 Minute USGS Topographic Quadrangle, 1984 ed. The mountain is seen on postcards, mainly viewed from the

Pennsylvania Turnpike The Pennsylvania Turnpike (Penna Turnpike or PA Turnpike) is a toll highway operated by the Pennsylvania Turnpike Commission (PTC) in the U.S. state of Pennsylvania. A controlled-access highway, it runs for across the state. The turnpike's we ...

, as vehicles exit west out of the

Tuscarora Mountain Tunnel Tuscarora Mountain Tunnel is one of four original Pennsylvania Turnpike tunnels still in active use. A second tube was bored in the late 1960s to ease traffic conditions. The Tuscarora Mountain tunnels measure in length and are the second-longes ...

northeast of the peak. Sometimes referred to as "Pyramid Point" or on early postcards as Henry's Knob, this landmark is one of the most noted on the turnpike. Sidneys Knob peak in the Appalachian Mountains of Pennsylvania

Sidneys Knob peak in the Appalachian Mountains of Pennsylvania

References

*
Postcard site including Sidneys Knob or "Henry's Knob"
Mountains of Pennsylvania Landforms of Fulton County, Pennsylvania {{FultonCountyPA-geo-stub