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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]
Ouachita Orogeny geologic map The Ouachita Mountains lie south of the Arkansas River valley which separates them from the Ozark plateau.. The Ouachita orogeny was a mountain-building event that resulted in the folding and faulting of strata currently exposed in the Ouachita Mountains.
The Sugarloaf Mountains-Midland Peak Natural Area is an upland area of connected mountain ridges in the Arkansas Valley adjacent to the Arkansas–Oklahoma border and south of Fort Smith, Arkansas. [1]
The Southern Oklahoma Aulacogen extends roughly 500 miles long (805 km) by ~80–90 miles wide (129–145 km). The two remaining continental plate boundary arms of the triple junction from which the Southern Oklahoma aulacogen formed became spreading zones for the spreading of the Iapetus Ocean during the breakup of the supercontinent, Rodinia, estimated to have occurred in the Cryogenian ...
The Piney Woods is a temperate coniferous forest terrestrial ecoregion in the Southern United States covering 54,400 square miles (141,000 km 2) of East Texas, southern Arkansas, western Louisiana, and southeastern Oklahoma.
The Wichita Mountains are located in the southwestern portion of the U.S. state of Oklahoma. [1] It is the principal relief system in the Southern Oklahoma Aulacogen, being the result of a failed continental rift. The mountains are a northwest-southeast trending series of rocky promontories, many capped by 500 million-year old granite.
The Black Fork Mountain Wilderness Area is located in the U.S. states of Arkansas and Oklahoma. Created by an act of Congress in 1984, the wilderness covers an area of 13,139 acres (53 km²). The Arkansas portion contains 8,430 acres (34.1 km 2 ) and the Oklahoma portion contains 5,140 acres (20.8 km 2 ).
The Arkansas Valley is a Level III ecoregion designated by the Environmental Protection Agency (EPA) in the U.S. states of Arkansas and Oklahoma.It parallels the Arkansas River between the flat plains of western Oklahoma and the Arkansas Delta, dividing the Ozarks and the Ouachita Mountains with the broad valleys created by the river's floodplain, occasionally interrupted by low hills ...