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The Pennsylvanian Allegheny Formation is a mapped bedrock unit in western and central Pennsylvania, western Maryland and West Virginia, and southeastern Ohio. It is a major coal-bearing unit in the Appalachian Plateau of the eastern United States. ==Description== In Pennsylvania, the Allegheny Formation includes rocks from the base of the Brooksville Coal to the top of the Upper Freeport Coal, and was defined to include all economically significant coals in the upper Pennsylvanian sequence.〔The Geology of Pennsylvania, C. H. Shultz, ed., DCNR Special Publication 1, 1999. (Ch. 10) ()〕 The formation consists of cyclothemic sequences of coal, shale, limestone, sandstone, and clay. It contains six major coal zones, which, in stratigraphic order, are: * Upper Freeport Coal * Lower Freeport Coal * Upper Kittanning Coal * Middle Kittanning Coal * Lower Kittanning Coal * Brookville Coal 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Allegheny Formation」の詳細全文を読む スポンサード リンク
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