| Contents |
Abstract -- Introduction -- Location of area -- Culture -- Physiographic subdivisions and topography -- Drainage -- Climate and vegetation -- Previous work -- Present investigation -- Geophysical program -- Bauxite drilling program -- Scope and personnel of the geologic work -- Acknowledgments -- Descriptive geology -- Geologic setting -- Sedimentary rocks -- Undifferentiated metamorphic rocks of Paleozoic age -- Tertiary system -- Paleocene series-Midway group -- General features -- Kincaid formation -- Wills Point formation -- Eocene series -- Wilcox group -- General features -- Berger formation -- Saline formation -- Detonti sand -- Claiborne and Jackson groups -- Undifferentiated Tertiary and Quaternary gravel -- Quaternary terrace deposits -- Quaternary alluvium -- Intrusive igneous rocks -- Nepheline syenite -- Porphyritic alkalic syenite (including pulaskite) -- Minor intrusive rocks -- Nepheline syenite and quartz syenite dike rocks -- Mafic dike rocks -- Porphyritic border rocks -- Pendant and contact rocks -- Rocks of the more deeply buried parts of the Little Rock igeneous complex -- Structural relationship -- Age and genetic relationship of igneous and sedimentary rocks -- Composition, classification, and origin of bauxite deposits -- History and definition of terms -- Usage of the terms "bauxite" and "laterite" -- Bauxite as defined in the present report -- Physical properties -- Lithic features of bauxite -- Granitic-textured bauxite -- Pisolitic bauxite -- Massive or claylike bauxite -- Vermicular structure -- Other structures formed by concretionary processes -- Cellular and scorialike forms -- Sedimentary structures -- Mineralogic character of bauxite -- Aluminum minerals -- Gibbsite -- Boehmite -- Kaolinite and halloysite -- Iron minerals -- Siderite -- Hematite -- Goethite -- Magnetite (and maghemite?) -- Pyrite -- Titanium minerals -- Ilmenite -- Sphene -- Anatase -- Rutile -- Minor accessory minerals -- Chlorite -- Chamosite -- Zircon -- Barite -- Other minerals -- Remarks on paragenesis -- Chemical features -- Composition of mineral constituents -- Silica -- Alumina and "available alumina" -- Iron oxides -- Titania -- Insoluable matter -- Combined water and carbon dioxide -- Graphic representation of bauxite composition -- Minor elements in bauxite -- Distribution of bauxite deposits -- Factors controlling the occurrence of bauxite -- Source rocks -- Subsurface topography -- Erosion and redeposition -- Types of bauxite depoists -- Type 1. Residual deposits on nepheline syenite -- Distribution -- Underlying rocks -- Range in altitude -- Shape and relation to the post-Midway erosion surface -- Thickness -- Cross section of the deposits -- Residual kaolinitic underclay -- Irregular clay bodies -- Decomposition boulders of kaolinized nepheline syenite -- Kaolin-bauxite transition -- Relation to overlying sediments -- Relation to other types of deposits -- Mines -- Type 2. Deposits in the bauxite-kaolin facies of the Berger formation -- Distribution -- Underlying rocks -- Range in altitude -- Shape and relation to the post-Midway erosion surface -- Thickness -- Bauxite-kaolin facies in cross section -- Fragmental underclay -- Lithologic character of bauxitic interval -- Hardcap -- Overclay -- Relation to other Berger sediments -- Relation to other types of deposits -- Mines -- Type 3. Bedded deposits in the Berger formation -- Distribution -- Underlying rocks -- Shape and relation to the underlying surface -- Thickness -- Lithologic character of the bauxite -- Hardcap -- Relation to the enclosing sediments -- Mines -- Type 4. Conglomeratic deposits at or near the base of the Saline formaiton -- Distribution -- Underlying rocks -- Shape and relation to the underlying surface -- Thickness -- Lithologic character of the bauxite -- Relation to other sediments of the Saline formation -- Mines -- Origin of the deposits -- Historical review of the theories on origin -- Bauxitization and kaolinization -- Factors that controlled the weathering process -- Climate -- Topography and drainage -- Porosity of the source rocks -- Altitude -- Effect of temperature -- Importance of organic matter in ground water -- Water table -- Time -- Summary -- Origin of type 1 deposits -- Leaching -- Concretion -- Formation of boehmite and magnetic iron oxide -- Migration of Al in solution -- Formation of kaolin bodies -- Introduction of siderite -- Origin of type 2 deposits -- Pre-Wilcox weathering and erosion -- Deposition of the colluvial apron -- Bauxitization of parts of the colluvium -- Introduction of kaolinite and siderite -- Origin of type 3 deposits -- Origin of type 4 deposits -- Age and duration of bauxitization -- Economic geology -- Discovery of bauxite in Arkansas -- Reserves -- Future production -- Descriptions of the bauxite deposits and mines -- Pulaski mining district -- Picron Hill area -- Bruton and Bruton Extension deposits -- Sweet Home embayment -- Fourche Bayou deposit -- Ratcliffe deposit -- Sweet Home deposit -- Deposits in the NW1/4 sec. 30, T. 1 N., R. 11 W -- Fuller School deposit -- Outcrops in the SW1/4 SW1/4 sec. 25, T. 1 N., R. 12 W -- Woodyardville area -- Cheatham deposit -- McClain-Burks-Nelson deposit -- Dixon-Nelson deposit -- Dixon deposit -- Vinson-Raines deposit / Ellis, Miller W. -- Woodyardville deposit -- Vick deposit -- Reichardt deposit -- Birnbach deposit / Kneedler, Elmer P. -- Coe deposit -- Glidewell deposit / Laval, William N. -- Ironton area -- Hempstead deposit -- Dreher-Junkin-Herrod deposit -- Dreher deposit -- Sipes deposit -- North and South Ironton deposits / Stephens, Hal G. -- Brown deposit / Shelton, Richard C. -- Maughan deposit -- Newman-Kendick deposit -- Smith deposit -- Cole and Hollenberg deposits / Collins, Jack B. -- Jennings Lake area -- Alford-Ross deposit / Sanford, Finis M. -- Rummel deposit / McGee, Horace W. -- Nutt-Bailey and Nutt Extension deposits / Jackson, John A., Cathcart, James A., and Bozion, Constantine N. -- E.A. Dixon deposit / Schneider, Robert -- Harrison deposit / Harris, Robert A. -- Hubbard deposit -- Bates deposit -- Kramer and Kramer Extension deposits / Schneider, Robert -- South Heckler deposit -- Jennings deposit -- Berger area -- North Heckler deposit -- West Rauch deposit -- Peter Rou deposit -- Winn deposit -- Dollar deposit -- Lewis deposit -- England and Berger deposits -- Elsie Lewis deposit -- Treadway deposit / McGee, Horace W. -- Vinson, McGuire deposit -- McGuire deposit -- Primrose Church basin -- Rauch Lake deposit -- East Lake deposit -- Finnegan deposit -- Echo Valley -- Area investigated between the two producing districts -- Mabelvale-Alexander area -- Ledbetter Creek area -- Sardis area -- Saline mining district -- Bryant area -- Osage deposit / Allen, William B. -- Bray -Thomas deposit / Powell, William J. -- Thomas-William deposit / Brown, Edwin A. -- Harris deposit (including South Harris ore body) / Shelton, Richard C. -- Brooks area -- Lasater-McMurry deposit / Kneedler, Elmer P. -- Chalkey deposit -- Walden group / Siple, George E. -- Bauxite outcrop, south side of Alexander Mountain -- David area -- Hurricane Creek area -- Mount Olive area -- Dupont deposit -- Mount Olive deposit -- McDonald deposit -- Little deposit -- Hurricane Creek deposit / Allen, William B. -- Bailey deposit -- Tindall deposit -- Chambers deposit -- McRaven deposit -- Brushy Creek area -- McNeil deposit / Jenke, Arthur L. -- East Bauxite deposit / Jenke, Arthur L. -- Grubbs-Hawkins deposit -- Long-Bell deposit / Bozion, Constantine N. -- Detonti area -- West Cargill deposits / Hewitt, Forrest A. -- Dentonti deposit / Powell, William J. -- Sutton deposit / McGee, Horace W. -- Crouch deposit -- Young deposit -- Neilson area -- Neilson deposit -- Bauxite-Woodland area -- Holly Creek deposit -- Section 16 deposit -- Pruden deposit -- Poodle deposit -- Stuckey deposit -- Ramsey deposit -- Pine Haven area -- Pine Haven deposit / Brown, Edwin A. -- Other economic deposits -- High-iron bauxite -- Clay -- High-alumina clay -- Ceramic clay -- Fuller's earth and bentonite -- Gravel -- Lignite -- Limestone -- Bibliography -- Index. |
