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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 most significant is the north–south oriented Boundary Fault which runs west of Widnes, St Helens and Skelmersdale and marks the western edge of the Carboniferous Coal Measures outcrop. A local high in the Palaeozoic basement running WSW-ENE through Merseyside separates the East Irish Sea Basin from the Cheshire Basin to the southeast.
The bottom of the formation is placed either at the bottom of Buck Mountain (no. 5) coal bed or at the bottom of the underclay or shale bed below this coal measure. Since this is the last bed deposited in the Appalachian Basin in eastern Pennsylvania that still exists, only recent alluvial and colluvial deposits rest on top.
In the mid-nineteenth century, much deeper pits were established and a network of railways was built in the Wrexham area to transport the coal. [ 2 ] A report on the North Wales Coalfield in the 1950s found that the reserves of coal were running low and that in the Denbighshire Coalfield, the geology of the coal-bearing strata dipped rapidly ...
Minnesota Geological Survey via Minnesota Geologic Topics; select Bedrock Geology, then select Geologic Map of Minnesota's Bedrock Geology: Author: Mark A. Jirsa, Terrence J. Boerboom, V.W. Chandler, John H. Mossler, Anthony C. Runkel, and Dale R. Setterholm: Permission (Reusing this file)
Several coal seams are named in the sequence. Some seams are absent in the northern part of the coalfield and are labelled as (S) whilst the others occur across the coalfield as a whole. The Chwarelau Seam which appears only in the north actually occurs within the underlying Millstone Grit sequence rather than the Coal Measures proper. The ...
British Coalfields. The Midlothian Coalfield is a coalfield in southeast Scotland situated immediately to the east and southeast of Edinburgh.It is geologically continuous with the East Fife Coalfield beneath the Firth of Forth though the undersea coal reserves have only been partly exploited.
The Brora Coalfield is a coalfield on the east coast of Sutherland in northern Scotland. [1] The 'Brora Main' is a 1m to 1.5m thick seam which has been mined in the Brora area.