Mining, Minerals and More in the Western Ouachita Mountains
Mining, Minerals and More in the Western Ouachita Mountains Mining, Minerals and More in the Western Ouachita Mountains
LaurasiaFigure 9. Late Mississippian to mid Pennsylvanian paleogeography of Arkansas showing the collision ofLaurasia and Llanoria, location of volcanics and formation of the Ouachita Mountains. From Guccione,1993.Landforms in the Ouachita Mountains RegionThe Ouachita Mountains Region contains thick sequences of sedimentary rocks deposited in adeep ocean basin that have been uplifted and compressed northward into east-west trendingcomplex folds (anticlines and synclines) and thrust faults due to a major orogenic (mountainbuilding) process called the Ouachita Orogeny.The rocks in the Ouachita Mountains Region have been exposed to weathering and erosionsince approximately 290 million years ago. This process has resulted in a series of sharp ridges,mostly east-west trending and often buckled and distorted, separated by narrow to broadvalleys. Streams display a trellis drainage pattern due to the geologic structure in this region.(Fig. 11)8
Landforms in this regionThe Ouachita Mountain Region contains mountains, canyons, valleys, ridges and pinnacles.Some islands are present in Lake Ouachita. Refer to the following quadrangles for theselandforms: Crystal Springs, Fountain Lake, Hamilton and Pinnacle Mountain.Figure 10. Diagram showing different landforms from the Ozark plateau surfaces tothe hogbacks in the Ouachita Mountains region.Figure 11. The three major drainage patterns in Arkansas.9
- Page 3 and 4: STATE OF ARKANSASARKANSAS GEOLOGICA
- Page 5 and 6: Table of ContentsGeologic Setting..
- Page 7: Educational Workshop Series 06 -
- Page 10 and 11: Figure 2. Digital ortho-photograph
- Page 12 and 13: This workshop focuses on the Stanle
- Page 14 and 15: Studies of paleocurrent, grain size
- Page 18 and 19: Varying stream patterns develop acc
- Page 20 and 21: Figure 13. Map showing location of
- Page 22 and 23: This area is rich in plant fossils.
- Page 24 and 25: The active portion of the quarry is
- Page 26 and 27: Figure 21. Load features on sandsto
- Page 28 and 29: References:Clardy, B.F., and Bush,
- Page 30 and 31: Sigillaria, an extinct coal-age tre
LaurasiaFigure 9. Late Mississippian to mid Pennsylvanian paleogeography of Arkansas show<strong>in</strong>g <strong>the</strong> collision ofLaurasia <strong>and</strong> Llanoria, location of volcanics <strong>and</strong> formation of <strong>the</strong> <strong>Ouachita</strong> Mounta<strong>in</strong>s. From Guccione,1993.L<strong>and</strong>forms <strong>in</strong> <strong>the</strong> <strong>Ouachita</strong> Mounta<strong>in</strong>s RegionThe <strong>Ouachita</strong> Mounta<strong>in</strong>s Region conta<strong>in</strong>s thick sequences of sedimentary rocks deposited <strong>in</strong> adeep ocean bas<strong>in</strong> that have been uplifted <strong>and</strong> compressed northward <strong>in</strong>to east-west trend<strong>in</strong>gcomplex folds (anticl<strong>in</strong>es <strong>and</strong> syncl<strong>in</strong>es) <strong>and</strong> thrust faults due to a major orogenic (mounta<strong>in</strong>build<strong>in</strong>g) process called <strong>the</strong> <strong>Ouachita</strong> Orogeny.The rocks <strong>in</strong> <strong>the</strong> <strong>Ouachita</strong> Mounta<strong>in</strong>s Region have been exposed to wea<strong>the</strong>r<strong>in</strong>g <strong>and</strong> erosions<strong>in</strong>ce approximately 290 million years ago. This process has resulted <strong>in</strong> a series of sharp ridges,mostly east-west trend<strong>in</strong>g <strong>and</strong> often buckled <strong>and</strong> distorted, separated by narrow to broadvalleys. Streams display a trellis dra<strong>in</strong>age pattern due to <strong>the</strong> geologic structure <strong>in</strong> this region.(Fig. 11)8
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