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Figure 1: Extent of the Silurian salt deposits in Michigan, Ohio, New York, and adjacent states [2] The Salina is an extensive formation. It ranges from West Virginia up through Pennsylvania into Ohio and then Michigan in the United States, and from Pennsylvania into New York. It is also found in the Canadian province of Ontario. (See Figure 1.)
The Red River is a major river in the Southern United States. [3] It was named for its reddish water color from passing through red-bed country in its watershed. [4] It also is known as the Red River of the South to distinguish it from the Red River of the North, which flows between Minnesota and North Dakota into the Canadian province of Manitoba.
As the name implies, the streams of this area have cut deep valleys with steep sided-slopes on the surrounding ridges. Some of the gorges are at least 1,000 feet (305 m) deep. Much of the area was forested at the end of the 19th century, and much of the area is owned by the Pennsylvania Bureau of Forestry.
The following is a list of the mapped bedrock units in Pennsylvania. The rocks are listed in stratigraphic order. The rocks are listed in stratigraphic order. [ 1 ]
The river flows to the east through the mountains within the county through several water gaps caused by a group of faults trending east–west through the central part of the county. The river then turns north and flows into Raystown Lake in Huntingdon County. The southern third of the county is drained by several tributaries of the Potomac River.
The other outwash deposits on the Allegheny, Ohio, and Beaver River terraces have no names. These deposits are typically red rust-colored, deeply weathered gravels composed of small, rounded pebbles generally less than 1 inch (2.5 cm) in diameter. Up to 10% of the pebbles are granites and other crystalline rocks.
In eastern Pennsylvania and New Jersey, the upper part of the Bloomsburg marks the Wallbridge Unconformity. To the west, the Wills Creek Formation lies conformably atop the Bloomsburg. Further west, the McKenzie Member of the Mifflintown Formation interfingers with the Bloomsburg and eventually, the Bloomsburg pinches out into the Mifflintown.
USGS Hydrologic Unit Map - State of Pennsylvania (1974) Shaw, Lewis C. (June 1984). Pennsylvania Gazetteer of Streams Part II (Water Resources Bulletin No. 16). Prepared in Cooperation with the United States Department of the Interior Geological Survey (1st ed.).