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The geology of Oklahoma is characterized by Carboniferous rocks in the east, Permian rocks in the center and towards the west, and a cover of Tertiary deposits in the panhandle to the west. The panhandle of Oklahoma is also noted for its Jurassic rocks as well. Cretaceous sediments are found in the south east.
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 earliest Carboniferous rocks sit conformably on top of the youngest Devonian in Illinois; Carboniferous rocks in the state are areally extensive, regionally very well-exposed, and form a large percentage of the state's bedrock. Illinois remained marine for much of the Carboniferous, with limestones making up most of the rock deposited ...
In North America, where the early Carboniferous beds are primarily marine limestones, the Pennsylvanian was in the past treated as a full-fledged geologic period between the Mississippian and the Permian. In parts of Europe, the Mississippian and Pennsylvanian are one more-or-less continuous sequence of lowland continental deposits and are ...
However, mining has a long history in the state, stretching back to the early 19th century. The Lubec Lead Mine was an early mine operating in the 1830s. Maine's first State Geologist, Charles T. Jackson, sketched a diagram of the site's limestone, greenstone trap-rock and veins of galena during an 1837 visit.
Carboniferous United States: geologic formations of the Carboniferous Period, in Paleozoic Era United States, North America. See also the preceding Category:Devonian United States and the succeeding Category:Permian United States
The oldest rocks are metamorphic and date to the Precambrian or early Paleozoic. Metamorphic rocks in the southwest of the state have been correlated to Cambrian and Ordovician rocks in Connecticut, while the quartzite, marble and greenschist of the Blackstone Group are common in northern Rhode Island. Other metamorphic rocks are exposed in ...
The Morrow facies (body of rock with specific characteristics) was deposited in a complex of mixed siliciclastic (mostly silica bearing rock) and carbonate depositional environments. [5] The Morrow Formation is typically divided into two intervals: The Morrow clastics; The overlying Morrow limestones; Source: [6]