University of Texas at Austin Libraries Home | Mobile | My Account | Renew Items | Sitemap | Help
support us
University of Texas Libraries
details contents options

Table of Contents

  1. Austin folio, Texas
    1. Geologic Atlas of the United States Austin Folio Texas

    2. Explanation

    3. The Topographic Map.

    4. The Geologic Map.

    5. Kinds of Rocks.

    6. Ages of Rocks.

    7. The Various Geologic Sheets.

    8. Description of the Austin Quadrangle.

    9. Geography.

    10. Topography.

    11. General Features.

    12. Relation Between Formation and Relief.

    13. Two Types of Topography.

    14. Edwards Plateau.

    15. A vast dissected plateau.

    16. Coastal Plain.

    17. Drainage.

    18. Sinuous canyon of the Colorado.

    19. Barton Creek Canyon.

    20. Onion Creek Valley.

    21. Antecedent and consequent streams.

    22. Culture.

    23. Forest and Woodland.

    24. General Geology.

    25. Sedimentary Rocks.

    26. Cretaceous Period.

    27. COMANCHE SERIES.

    28. TRINITY DIVISION.

    29. Basal conglomerate of the lower Cretaceous.

    30. Lowest oyster-shell bed.

    31. Conspicuous yellow limestone layers.

    32. Limestone suitable for carving.

    33. FREDERICKSBURG DIVISION.

    34. Persistent bed of white, chalky limestone.

    35. Beds of pure carbonate of lime.

    36. Great quantities of flints.

    37. Evidence of deep submergence.

    38. Series of alternate cliffs and slopes.

    39. WASHITA DIVISION.

    40. Laminated clay containing great abundance of a peculiar oyster shell.

    41. Red spotted limestone.

    42. GULF SERIES.

    43. COLORADO DIVISION.

    44. Bituminous clay containing fossil teeth and bones.

    45. Glaring white chalk, occurring in the streets of Austin.

    46. MONTANA DIVISION.

    47. Unctuous blue clay and marl.

    48. Greenish glauconitic marl.

    49. Eocene Period.

    50. Faunal break between the Cretaceous and Eocene.

    51. Surficial Rocks.

    52. Neocene Period.

    53. Great deposit of loose flints.

    54. Pleistocene Period.

    55. Terrace gravels of granitic debris.

    56. Igneous Rocks.

    57. Remnants of an extinct volcano.

    58. Geologic Structure.

    59. Zone of faulting along the Balcones scarp.

    60. Geologic History.

    61. Pre-Cretaceous land area.

    62. Uplift in the middle of the Cretaceous period.

    63. Explanation of the zone of faulting.

    64. River terraces in the plateau region.

    65. The ancient Colorado River.

    66. Economic Geology.

    67. Oil.

    68. Structural Material.

    69. Austin marble.

    70. Flint.

    71. Road Metal.

    72. Cabinet Specimens and Mineral Curios.

    73. Glass Sand.

    74. Soils.

    75. Artesian Waters.

    76. Topographic Sheet

    77. Historical Geology Sheet

    78. Structure-Section Sheet

    79. Columnar Section Sheet 1

    80. Columnar Section Sheet 2

    81. Illustration Sheet

    82. Illustration Sheet

  2. Illustrations
    1. INDEX MAP

    2. Fig. 1.—Ideal sketch and corresponding contour map.

    3. Fig. 2.—Sketch showing a vertical section in the front of the picture, with a landscape beyond.

    4. Fig. 3.—Symbols used to represent different kinds of rock.

    5. Fig. I.—Provinces and minor subdivisions of the Texas region.

    6. Fig. 2.—Northeast-southwest section crossing the Colorado River 8 miles west of Austin, showing the dissection of the Edwards Plateau by the Colorado River and its tributaries, and the benches formed by the harder beds. Horizontal scale, 1 inch =1^ miles; vertical scale, 1 inch = 2250 feet. Natural profile is shown in shaded drawing below section.

    7. Fig. 3.—Section along the south side of the Colorado River, passing through Austin, showing the details of the Balcones fault zone, and the increase of dip toward the east. Horizontal and vertical scales, 1 inch = 3000 feet.

    8. LEGEND

    9. Untitled

    10. Untitled

    11. LEGEND

    12. Untitled

    13. Untitled

    14. Untitled

    15. LEGEND

    16. Untitled

    17. Untitled

    18. Fig. 4.-TERRACE OF OLD ALLUVIUM UPON UPPER BEDS OF THE EDWARDS LIMESTONE, COLORADO VALLEY, WEST AUSTIN, Showing previously eroded surface ot the limestone.

    19. Fig. 5.-RESIDUAL GRAVEL OF THE UVALDE FORMATION IN THE BLACK PRAIRIE REGION. Composed of flint nodules derived from the Edwards limestone in the region of the Edwards Plateau.

    20. Fig. 6.-MINOR BLOCK FAULTING IN THE EDWARDS LIMESTONE, BARTON CREEK. Showing the type of faulting in the Balcones fault zone.

    21. Fig. 7.-TYPICAL EXPOSURE OF TAYLOR MARL, BLUE BLUFF, COLORADO RIVER. Remnant of a gravel terrace caps the bluff at the right.

    22. Fig. B.—CLIFF OF AUSTIN CHALK, ONION CREEK. Interbedded volcanic tuff at the base of the exposure.

    23. Fig. 9.-GLEN ROSE FORMATION, FORMING WEST BLUFF OF MOUNT BONNEL. Old alluvial plain of the Colorado River, cut in the Edwards Plateau, is shown in the valley on the left.

    24. Fig. 22. Fig. 17, Fig. 18. Fig. 10. Fig. 23. Fig. 21. Fig. 20. Fig. 11. Fig. 19. CHARACTERISTIC FOSSILS OF THE WALNUT CLAY AND COMANCHE PEAK LIMESTONE. Figs. 17, 18. Exogyra texana Roemer, Fig. 19. Gryphaea marcoui Hill and Vaughan. Fig. 20. Pseudodiadema texanum Roemer. Fig. 21. Enallaster texanus Roemer. Fig. 12. Fig. 24. Fig. 14. Fig. 13. Fig. 27, Fig. 26. Ffg. 25. CHARACTERISTIC FOSSILS OF THE EDWARDS LIMESTONE. Fig. 22. Monopleura pinguiscula White. Fig. 23. Requienia patigiata White. Fig. 24. Monopleura marcida White. Fig. 25. Chondrodonta (sma'l specimen). Fig. 26. Radiolites davidsoni Hill. Fig. 28, Fig. 15. Fig. 29. CHARACTERISTIC FOSSILS OF THE TRAVIS PEAK AND GLEN ROSE FORMATIONS. Fig. 10. Lunatia (Tylostoma) pedernalis Roemer. Fig. 11. Ammonites justinae Hill. Fig. 12. Glauconia branneri Hill. Fig. 13. Trigonia lerchii Hill. Fig. 14. Cyprina? mediale Conrad. Fig. 15. Pholadomya henselii Hill. Fig. 16. Ostrea ragsdalei Hill. Fig. 16. Fig. 30. Fig. 32. Fig. 35 Fig. 36. CHARACTERISTIC FOSSILS OF THE DEL RIO CLAY. Fig. 34. Gryphaea mucronata Roemer. Figs. 35, 36. Exogyra arietina Roemer Fig. 40. Fig 31. Fig. 33, CHARACTERISTIC FOSSILS OF THE GEORGETOWN LIMESTONE. Fig. 27. Epiaster elegans Shumard. Fig. 28. Gryphaea washitaensis Hill. Fig. 29. Turrilites brazoensis Roemer. Figs. 30, 31. Terebratula (Kingena) wacoensis Roemer. Fig. 32. Ammonites (Schloenbachia) leonensis Conrad. Fig, 33. Ostrea (Alectryonia) carinata Lamarck. Fig. 34. Fig. 41 Fig. 39. Fig. 38. Fig. 37. CHARACTERISTIC FOSSILS OF THE EAGLE FORD FORMATION. Fig. 37. Inoceramus fragilis Hall and Meek. Figs. 38, 39, 40, 41 . Shark teeth. Fig. 49. i size Fig. 51. Fig. 44. Fig. 43 Fig 48. Fig. 47. Fig. 45 CHARACTERISTIC FOSSILS OF THE AUSTIN CHALK. Fig. 42. Ostrea (Alectryonia) diluviana Lamarck. Fig. 43. Exogyra lasviscula Roemer. Fig, 44. Gryphasa aucella Roemer. Fig. 45. Hemiaster texanus Roemer. Fig. 46. Exogyra ponderosa Roemer. Fig 50. CHARACTERISTIC FOSSILS OF THE TAYLOR MARL AND WEBBERVILLE FORMATION. Fig. 47. Turritella trilineata Conrad. Fig. 48. Sphenodiscus lenticularis? Meek. Fig. 49, Veniella lineata Shumard. Fig. 50. Ostrea larva Lamarck. Fig 51. Gryphaea vesicularis Lamarck, Fig, 52. Exogyra costata Say. i size. Fig. 42. Fig. 46 Fig 52.

Illustration Sheet

U. S. GEOLOGICAL SURVEY CHARLES D. WALCOTT, DIRECTOR

Fig. 4.-TERRACE OF OLD ALLUVIUM UPON UPPER BEDS OF THE EDWARDS LIMESTONE, COLORADO VALLEY, WEST AUSTIN, Showing previously eroded surface ot the limestone.

TEXAS AUSTIN QUADRANGLE

Fig. 5.-RESIDUAL GRAVEL OF THE UVALDE FORMATION IN THE BLACK PRAIRIE REGION. Composed of flint nodules derived from the Edwards limestone in the region of the Edwards Plateau.

Fig. 6.-MINOR BLOCK FAULTING IN THE EDWARDS LIMESTONE, BARTON CREEK. Showing the type of faulting in the Balcones fault zone.

Fig. 7.-TYPICAL EXPOSURE OF TAYLOR MARL, BLUE BLUFF, COLORADO RIVER. Remnant of a gravel terrace caps the bluff at the right.

Fig. B.—CLIFF OF AUSTIN CHALK, ONION CREEK. Interbedded volcanic tuff at the base of the exposure.

Fig. 9.-GLEN ROSE FORMATION, FORMING WEST BLUFF OF MOUNT BONNEL. Old alluvial plain of the Colorado River, cut in the Edwards Plateau, is shown in the valley on the left.