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.
Shaded relief map showing the east-west trending ridges and zig-zag ridges.
Inclined bedding in the Stanley Shale in Hot Springs Arkansas
Folded strata in the Big Fork Chert near Hot Springs