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In western Pennsylvania, large bituminous coal fields exist in rocks with a similar age as the rocks in the anthracite region. Many of the folds in the province are high amplitude and stretch for miles. In glaciated sections, steep canyons developed and much of the terrain have many glacial features. The drainage pattern in this area is dendritic.
Bureau of Topographic and Geologic Survey, Pennsylvania Department of Conservation and Natural Resources, Harrisburg, Pennsylvania. (Note: having been published in 1959, this reference uses the now obsolete and abandoned classic, Nebraskan, Kansan, and so forth, Midwest glacial terminology.)
The Allegheny Plateau (/ ˌ æ l ɪ ˈ ɡ eɪ n i / AL-ig-AY-nee) is a large dissected plateau area of the Appalachian Mountains in western and central New York, northern and western Pennsylvania, northern and western West Virginia, and eastern Ohio. It is divided into the unglaciated Allegheny Plateau and the glaciated Allegheny Plateau.
Lake Monongahela was a proglacial lake in western Pennsylvania, West Virginia, and Ohio.It formed during the Pre-Illinoian ice epoch when the retreat of the ice sheet northwards blocked the drainage of these valleys to the north.
The Glacier Movements also created other distinctive features of this region, including peat bogs and swamps, which resulted when glacial scour produced un-drained scars on the plateau's surface. Examples of depressions created by glacial scour include Deep Lake and Wolf Swamp just west of Big Pocono State Park .
Archbald Pothole State Park is a 149.16-acre (60.36 ha) Pennsylvania state park in Archbald, Lackawanna County, Pennsylvania. The focal point of the park is Archbald Pothole. The pothole is a remnant of the Wisconsin Glacial Period, 38 feet (11.6 m) deep with a largest diameter of 42 feet (12.8 m) by 24 feet (7.3 m). It has drawn tourists since ...
The current geography was slightly modified during the last ice age by the Wisconsin Glacier about 15,000 years ago. Glacial striations can be found on the rocks of some of the high ridges, but the area was at the margin of the ice sheet, and the impact was much less than in New York just to the north.
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 ]