AGS / Education / Geology Resources / Physiographic Regions / Ouachita Mountains / Geology
| The Ouachita Mountain Region contains thick sequences of sedimentary rocks deposited in a deep ocean basin that have been uplifted and compressed northward into east-west trending complex folds (anticlines and synclines) and thrust faults due to major orogenic (mountain building) processes. The most intensely deformed area is in the central portion of the fold belt. |
 Vertical bedding at Y-City |
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 Synlinal fold in rocks near Hot Springs Arkansas |
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