Broad Top is a

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 ...

located in south-central

Pennsylvania Pennsylvania (; (Pennsylvania Dutch: )), officially the Commonwealth of Pennsylvania, is a state spanning the Mid-Atlantic, Northeastern, Appalachian, and Great Lakes regions of the United States. It borders Delaware to its southeast, Ma ...

. It extends into

Huntingdon County Huntingdon is a market town in the Huntingdonshire district in Cambridgeshire, England. The town was given its town charter by King John in 1205. It was the county town of the historic county of Huntingdonshire. Oliver Cromwell was born there ...

to the north,

Fulton County Fulton County is the name of eight counties in the United States of America. Most are named for Robert Fulton, inventor of the first practical steamboat: *Fulton County, Arkansas, named after Governor William Savin Fulton *Fulton County, Georgia *F ...

to the southeast, and Bedford County to the southwest. It is bounded to the west by Saxton Mountain and Terrace Mountain, and to the east by

Sideling Hill Sideling Hill, also Side Long Hill, is a long, steep, narrow mountain ridge in the Ridge-and-Valley (or Allegheny Mountains) physiographic province of the Appalachian Mountains, located in Washington County in western Maryland and adjacent West ...

. In Bedford County, Harbor Mountain forms the southern boundary. Trough Creek Valley lies between the mountains.

State Lands

Pennsylvania State Game Lands The Pennsylvania State Game Lands (SGL) are lands managed by the Pennsylvania Game Commission (PGC) for hunting, trapping, and fishing. These lands, often not usable for farming or development, are donated to the PGC or purchased by the PGC with h ...

67, 121, and 267 lie on Broad Top. Part of

Rothrock State Forest Rothrock State Forest is a Pennsylvania state forest in Pennsylvania Bureau of Forestry District #5. The main offices are located in Huntingdon in Huntingdon County, Pennsylvania in the United States. Rothrock State Forest is located in Centre, ...

lies on Broad Top as well, as is most of

Trough Creek State Park Trough Creek State Park is a Pennsylvania state park in Cass, Penn and Todd Townships, Huntingdon County, Pennsylvania in the United States. The majority of the park is in Todd Township along Pennsylvania Route 994, east of the unincorporat ...

Geology

The bedrock of Broad Top consists of relatively flat-lying

Paleozoic The Paleozoic (or Palaeozoic) Era is the earliest of three geologic eras of the Phanerozoic Eon. The name ''Paleozoic'' ( ;) was coined by the British geologist Adam Sedgwick in 1838 by combining the Greek words ''palaiós'' (, "old") and ' ...

sedimentary Sedimentary rocks are types of rock that are formed by the accumulation or deposition of mineral or organic particles at Earth's surface, followed by cementation. Sedimentation is the collective name for processes that cause these particles ...

rocks that are

stratigraphically Stratigraphy is a branch of geology concerned with the study of rock layers (strata) and layering (stratification). It is primarily used in the study of sedimentary and layered volcanic rocks. Stratigraphy has three related subfields: lithostrati ...

higher, and thus younger than the rocks immediately surrounding the plateau. Mapped formations on the plateau include the

Mississippian Mississippian may refer to: * Mississippian (geology), a subperiod of the Carboniferous period in the geologic timescale, roughly 360 to 325 million years ago *Mississippian culture, a culture of Native American mound-builders from 900 to 1500 AD ...

Devonian The Devonian ( ) is a geologic period and system of the Paleozoic era, spanning 60.3 million years from the end of the Silurian, million years ago (Mya), to the beginning of the Carboniferous, Mya. It is named after Devon, England, w ...

Rockwell Formation The Rockwell Formation is a late Devonian and early Mississippian mapped bedrock unit in West Virginia, Maryland, and Pennsylvania, in the United States. Description The Rockwell Formation was described at its type section at Rockwell Run in West ...

, the

Pocono Formation The Mississippian Pocono Formation is a mapped bedrock unit in Pennsylvania, Maryland, and West Virginia, in the United States. It is also known as the Pocono Group in Maryland and West Virginia, and the upper part of the Pocono Formation is someti ...

and

Mauch Chunk Formation The Mississippian Mauch Chunk Formation is a mapped bedrock unit in Pennsylvania, Maryland, and West Virginia. It is named for the township of Mauch Chunk, now known as borough of Jim Thorpe, Pennsylvania and for nearby Mauch Chunk Ridge where the ...

, and the

Pennsylvanian Pennsylvanian may refer to: * A person or thing from Pennsylvania * Pennsylvanian (geology) The Pennsylvanian ( , also known as Upper Carboniferous or Late Carboniferous) is, in the International Commission on Stratigraphy, ICS geologic timesca ...

Pottsville Group, Allegheny Formation, and Conemaugh Group.Map 61: Atlas of Preliminary Geologic Quadrangle Maps of Pennsylvania, compiled and edited by Thomas M. Berg and Christine M. Dodge, 1981, Pennsylvania Geologic Survey, 4th Series, Harrisburg, PA (Saxton Quadrangle, Wells Tannery Quadrangle, Entriken Quadrangle, Cassville Quadrangle, Saltillo Quadrangle, Huntingdon Quadrangle, Mount Union Quadrangle) Although Broad Top lies within the Ridge and Valley Physiographic Province, it is actually more similar to the Allegheny Plateau due to its flat-lying rocks and stratigraphic similarity to rocks there.

Bituminous Asphalt, also known as bitumen (, ), is a sticky, black, highly viscous liquid or semi-solid form of petroleum. It may be found in natural deposits or may be a refined product, and is classed as a pitch. Before the 20th century, the term ...

coal Coal is a combustible black or brownish-black sedimentary rock, formed as stratum, rock strata called coal seams. Coal is mostly carbon with variable amounts of other Chemical element, elements, chiefly hydrogen, sulfur, oxygen, and nitrogen ...

has been mined in the Broad Top area, and the coal field is known as the Broad Top Field. Nearly all of the coal lies within the Allegheny Formation
PA Geologic Survey Map 11
. Abandoned mines exist in the area and

acid mine drainage Acid mine drainage, acid and metalliferous drainage (AMD), or acid rock drainage (ARD) is the outflow of acidic water from metal mines or coal mines. Acid rock drainage occurs naturally within some environments as part of the rock weathering ...

is an environmental problem, where several fishless streams exist as a result of the discharge from the abandoned mines

References

{{coord missing, Pennsylvania Landforms of Pennsylvania Plateaus of the United States