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A city style marker in Philadelphia, the state's largest city Clickable map of Pennsylvania counties. This is a list of Pennsylvania State Historical Markers which were first placed by the Commonwealth of Pennsylvania in 1914 and are currently overseen by the Pennsylvania Historical and Museum Commission (PHMC) as part of its Historical Markers Program.
Interstate 476 (I-476) is a 132.1-mile (212.6 km) auxiliary Interstate Highway of I-76 in the U.S. state of Pennsylvania.The highway runs from I-95 near Chester north to I-81 near Scranton, serving as the primary north–south Interstate corridor through eastern Pennsylvania.
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 region is a large broad ridge with a steep ascent from east to west and rolling hills away from the ridge. The Allegheny Front reaches its highest elevation in Pennsylvania at Blue Knob, 3,136 feet (956 m), an unusual bulge along this symmetrical ridgeline. Streams that cut into the ridge are often shallow and steep.
The darker blue color resulted in limestone from this region being dubbed "bluestone" and with two sequences measuring about 10,000 feet (3,000 m) thick, it gives the area one of the largest limestone deposits in the world. [20] The stone eventually fades from a deep blue to a light grey after prolonged exposure to sun and rain.
The population density was 2,133.8 inhabitants per square mile (823.9/km 2). There were 767 housing units at an average density of 996.1 per square mile (384.6/km 2). The racial makeup of the borough was 97.1% White, 0.4% African American, 0.3% American Indian or Alaska Native, 1% Asian, 0.4% some other race, and 0.8% from two or more races.
Blue Mountain, Blue Mountain Ridge, or the Blue Mountains of Pennsylvania, is a ridge of the Appalachian Mountains in eastern Pennsylvania.Forming the southern and eastern edge of the Ridge-and-Valley Appalachians physiographic province in Pennsylvania, Blue Mountain extends 150 miles (240 km) from the Delaware Water Gap on the New Jersey border in the east to Big Gap in Franklin County in ...
The Tionesta Scenic and Research Natural Areas are adjacent protected areas in the Allegheny National Forest of northwestern Pennsylvania. They cover a combined 4,131 acres (1,672 ha) of the Allegheny Plateau and contain some 4,000 acres (1,600 ha) of old-growth forest representative of the area. They are located in Warren County and McKean County.