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AGS / Education / Geology Resources / Physiographic Regions / Ouachita Mountains


The Ouachita Mountain Region consists of a series of sharp ridges, mostly east-west trending and often buckled and distorted, separated by narrow to broad valleys.  Surface rocks from this region are mostly shales, sandstone, novaculite, chert and minor limestone.  To learn about the geology in this region click here.

Ouachita shaded relief map
Shaded relief map showing the east-west trending ridges and zig-zag ridges.



Stanley Shale in Hot Springs Arkansas

Inclined bedding in the Stanley Shale in Hot Springs Arkansas



Folded strata in he Big Fork Chert near Hot Springs

Folded strata in the Big Fork Chert near Hot Springs



Learn about the geology of the Ouachita Mountains forward arrow


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Arkansas Geological Survey
Vardelle Parham Geology Center
3815 West Roosevelt Road
Little Rock, AR 72204
Phone: 501-296-1877 | Fax: 501-663-7360
Business Hours: Monday - Friday 8:00am - 4:30pm

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