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Geologic Map of West Virginia. West Virginia's geologic history stretches back into the Precambrian, and includes several periods of mountain building and erosion. At times, much of what is now West Virginia was covered by swamps, marshlands, and shallow seas, accounting for the wide variety of sedimentary rocks found in the state, as well as its wealth of coal and natural gas deposits.
Continental collisions raised the Appalachian-Ouachita chain to a lofty mountain range on the scale of the present-day Himalayas. The massive bulk of Pangea was completed near the end of the Paleozoic era (the Permian period) when Africa plowed into the continental agglomeration, with the Appalachian-Ouachita mountains near the middle. [10]
The Ouachita Mountains (/ ˈ w ɒ ʃ ɪ t ɔː /), simply referred to as the Ouachitas, are a mountain range in western Arkansas and southeastern Oklahoma. They are formed by a thick succession of highly deformed Paleozoic strata constituting the Ouachita Fold and Thrust Belt, one of the important orogenic belts of North America . [ 3 ]
The Appalachians, at their initial formation, were a part of the larger Central Pangean Mountains along with the Scottish Highlands, the Ouachita Mountains, and the Anti-Atlas Mountains. The modern ranges were formed and/or deformed by the Acadian , Caledonian , Alleghenian , Mauritanide and Variscan orogenies with the Alleghenian orogeny being ...
The Ouachita orogeny was a mountain-building event that resulted in the folding and faulting of strata currently exposed in the Ouachita Mountains. The more extensive Ouachita system extends from the current range in Arkansas and Oklahoma southeast to the Black Warrior Basin in Alabama and to the southwest through the Llano , Marathon , and ...
Ouachita orogeny – Mountain-building event that resulted in the Ouachita Mountains Ouachita Mountains of Arkansas and Oklahoma is an orogenic belt that dates from the late Paleozoic Era and is most likely a continuation of the Appalachian orogeny west across the Mississippi embayment – Reelfoot Rift zone.
The Jackfork Sandstone, also referred to as the Jackfork Group, is a geologic formation associated with the Ouachita Fold and Thrust Belt exposed in western Arkansas and southeastern Oklahoma. [2] It is named for Jackfork Mountain in Pittsburg and Pushmataha counties, Oklahoma. [2] [3]
At the time of the Cambrian explosion, as multi-cellular became commonplace, Arkansas was primarily flooded by rivers and a shallow marine environment.In the Ozark region, calcareous, quartzose sand and clay deposited, while the Ouachita area witnessed the formation of alternating layers of sand, clay, silt and small amounts of lime mud.