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The Pittsburgh coal seam is the thickest and most extensive coal bed in the Appalachian Basin; [1] hence, it is the most economically important coal bed in the eastern United States. The Upper Pennsylvanian Pittsburgh coal bed of the Monongahela Group is extensive and continuous, extending over 11,000 mi 2 through 53 counties.
The Monongahela Formation is a geologic formation in West Virginia, Pennsylvania, Ohio, and Maryland.It is dated to the Carboniferous period.The top of the group is marked by the Waynesburg Coal (No. 11 Coal) and its base is marked by the Pittsburgh coal seam (No. 8 Coal).
The Allegheny Group, often termed the Allegheny Formation, [2] is a Pennsylvanian-age geological unit in the Appalachian Plateau.It is a major coal-bearing unit in the eastern United States, extending through western and central Pennsylvania, western Maryland and West Virginia, and southeastern Ohio.
The panhandle coalfield is a coalfield located in the northern panhandle of West Virginia counties of Hancock, Brooke, Ohio, Marshall, and Wetzel.Mining is primarily in the Pittsburgh coal seam, sometimes called the No. 8 seam, which is of a steam rather than metallurgical nature in this region.
The Conemaugh Group overlies the Upper Freeport coal bed of the Allegheny Formation and underlies the Pittsburgh coal seam of the Monongahela Group. The Conemaugh Group consists of cyclic sequences of shale, siltstone, sandstone, red beds, thin impure limestone, and thin nonpersistent coal. Red beds are associated with landslides. [3]
In 1942, Office of War Information photographer John Collier visited the Montour No. 4 Mine of the Pittsburgh Coal Company in Pennsylvania.
In the early history of Pittsburgh, Mount Washington was known as Coal Hill, but Coal Hill was actually on the south bank of the Monongahela River. [1] Easy access to the Pittsburgh coal seam's outcrop near the base of Mount Washington allowed several mines to operate there. Also, rock was quarried from the hill.
Ohio regulators have approved of subsidies totaling more than $100 million for two coal-fired plants, a legacy of the House Bill 6 scandal. Ohio regulators OK $100 million in subsidies for 2 aging ...