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General geology of the eastern frontal Ouachita Mountains and southeastern Arkansas Valley, Arkansas



General geology of the eastern frontal Ouachita Mountains and southeastern Arkansas Valley, Arkansas



Pages 195-221 1966



The frontal Ouachitas here comprise an east-west trending belt about 15 miles wide, with steep, narrow, commonly overturned folds, some chaotic structure and major thrust faults; Stanley Shale and Jackfork Sandstone are exposed, except east of the Fall Line. The transition zone on the north has simpler structures crossed by several major thrust faults; at the surface here and also in the Arkansas Valley folded area Atoka sandstones and shales are exposed. Hartshorne Sandstone and McAlester Shale, both Pennsylvanian, are preserved in synclines. Pleistocene terrace deposits and Recent alluvium occur along the Arkansas River and some smaller streams. There are a few igneous dikes, sills, and volcanic breccias of Cretaceous(?) age, and numerous older quartz veins in the southern part.

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