Front Cover

Preface - Geology of the Austin Area

Author's Note

Editor's Note

CHAPTERS

Chapter 1

GEOLOGIC HISTORY OF THE AUSTIN AREA

Precambrian Era

Paleozoic Era

Triassic and Jurassic Periods

Cretaceous Period

Cenozoic Era

Chapter 2

ROCKS OF THE AUSTIN AREA

Glen Rose Limestone

Walnut Formation

Bull Creek Member

Bee Cave Member

Edwards Limestone

Georgetown Formation

Del Rio Claystone

Buda Limestone

Eagle Ford Formation

Pepper Shale Member

Cloice Shale Member

Bouldin Flags Member

South Bosque Member

Austin Chalk

Atco Member

Vinson Member

Jonah Member

Dessau Member

Burditt Member

"Pyroclastic" Member

"Basalt"

Pflugerville Member

McKown Member

Sprinkle Formation

Pecan Gap Chalk

Bergstrom Formation

Corsicana Formation

Kemp Formation

Terrace Deposits

Chapter 3

THE BALCONES FAULT ZONE OF AUSTIN

The Balcones Escarpment

Rocks Exposed Along the Balcones Fault

Movement Along the Balcones Fault Zone

Geologic Framework of the Balcones Fault Zone

Chapter 4

PILOT KNOB - A CRETACEOUS VOLCANO

History of the Volcano

Dating the Volcanic Activity

Where Does the Magma Come From?

How to See Pilot Knob

Chapter 5

COLLECTING LOCALITIES FOR FOSSILS IN AUSTIN

APPENDICES

Austin's Earth Science Resources

Field Trip 1: Shoal Creek

Field Trip 2: Balcones Fault

Glossary of Terms

TABLE OF ILLUSTRATIONS

1. Ouachita Structural Belt
2. Central Texas in the Upper Pennsylvanian
3. Paleozoic Rocks, Austin Area
4. Central Texas in the Lower Cretaceous
5. Edwards Paleogeography, Central Texas
6. Symbols for Stratigraphic Cross-sections
7. Mount Bonnell
8. City Park
9. Bee Caves Road, Westlake Hills
10. Walnut Clay Drive in Northwest Hills
11. Section of Walnut-Whitestone School Area, Williamson-Travis Counties
12. Low Water Bridge (near Tom Miller Dam)
13. Sixth Street Underpass
14. Pease Park
15. Shoal Creek
16. South Lamar Blvd. - Bouldin Creek
17. Williamson Creek
18. Watters Park
19. Bouldin Creek, Missouri-Pacific Drainage Canal
20. Bouldin Creek at Milton Street
21. Atlas Cement Co. Quarry, South Bosque, McLennan County
22. Vinson Creek
23. San Gabriel River at Jonah
24. Little Walnut Creek and Old Sprinkle Bridge
25. Dessau Road off Walnut Creek
26. Rinard Creek at Old Turnersville Road Crossing
27. Lower McKinney Falls, McKinney Falls State Park
28. Rim Rock Section
29. Little Walnut Creek North of Manor Highway
30. Jane's Farm - North of Marble Creek
31. Springdale Road at Little Walnut Creek
32. South Bank of Walnut Creek at Old Sprinkle Road
33. McKown Quarry on Onion Creek
34. Walnut Hill
35. Bergstrom-Corsicana Boundary Once Exposed 7/8 Mile West of Noack, Williamson County
36. Profile of an Erosional Escarpment
37. Comparative Resistances Between Austin Rocks
38. A Fault
39. Evolution of Topography Along a Fault
40. Classification of Fault Types
41. Sharing of Displacement of a Fault
42. "Dying-out" of a Fault
43. Joining (or Splitting) of a Fault
44. A Drag-block
45. A Graben
46. Cross-section of Subsurface Austin
47. Extensional Origin of Graben
48. Cross-section through Balcones Fault
49. Legend to Structural Cross-section (Fig. 48)
50. Geologic Map of the Pilot Knob Complex
51. North-South Section through Pilot Knob
52. North-South Stratigraphic Correlation through Austin
53. East-West Stratigraphic Correlation (Pilot Knob Vicinity)
54. Balcones Fault Zone of Texas
55. a. Region Prior to Formation of Graben
    b. Region During Formation of Graben
    c. Region After Formation of Graben
56. Subsurface Relations of Barton Springs

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