2. Logging Carbonates Field Trip 2 Preparation

3. Logging Carbonates Depth/Scale/Contacts Texture (Dunham) Mineral Composition Allochem Composition Bioturbation Color Fossils Sedimentary Structures / Textures Porosity Comments Text: Boggs p. 170-186; Manual p. 90-94

4. Grn l Pk l Wke l Mudst

5. Mark major contacts (color, grains size, lithology, etc.) Determine nature of contacts (sharp, gradational, erosional) S SharpG Gradational SI Sharp irregularB Gradational-interbedded SC Sharp conformableVS Visibly scoured SD Sharp disconformableBU Burrowed ST Stylolite Depth/Scale/Contacts Calculate total depth and appropriate scale / units

6. Texture Determine Dunham texture between major contacts. Plot texture / weathering profile. Grainstone : Packstone : Wackestone : Mudstone

7. http://www.glossary.oilfield.slb.com/DisplayImage.cfm?ID=24 Texture

8. http://www.eos.ubc.ca/courses/eosc221/sed/carb/classification.html Texture

9. Logging Carbonates Depth/Scale/Contacts Texture (Dunham) Mineral Composition Allochem Composition Bioturbation Color Fossils Sedimentary Structures / Textures Porosity Comments Text: Boggs p. 170-186; Manual p. 90-94

10. Mineral Composition (Manual p. 92)

11. Allochem Composition (Manual p. 93)

12. (M. Campbell) Allochem Composition

13. (M. Campbell) Allochem Composition

14. (416M)

15. Logging Carbonates Depth/Scale/Contacts Texture (Dunham) Mineral Composition Allochem Composition Bioturbation Color Fossils Sedimentary Structures / Textures Porosity Comments Text: Boggs p. 170-186; Manual p. 90-94

16. Bioturbation Determine extent of bioturbation

17. Color Indicate color with letter symbols. L - LightG - GrayC - Cream M - MediumB - BrownW - White D - Dark R - RedBk - Black m - Mottled O - Orange Cl - Clear Y - Yellow Gn - Green Bl – Blue Example: LBG = light brownish gray

18. Logging Carbonates Depth/Scale/Contacts Texture (Dunham) Mineral Composition Allochem Composition Bioturbation Color Fossils Sedimentary Structures / Textures Porosity Comments Text: Boggs p. 170-186; Manual p. 90-94

19. (416M)

20. Sedimentary Structures / Textures (Manual, p. 94)

21. Logging Carbonates Depth/Scale/Contacts Texture (Dunham) Mineral Composition Allochem Composition Bioturbation Color Fossils Sedimentary Structures / Textures Porosity Comments Text: Boggs p. 170-186; Manual p. 90-94

22. Porosity (Manual, p. 91)

23. Comments Include comments of features not depicted graphically - paleosols - ghost grains - unusual minerals - cements (spar) - porosity (percentage estimates)

24. Logging Carbonates Field Trip 2 Preparation

25. Field Trip #2: Paleozoic Rocks Location Geology Assignment / Methods Reminders Text: Manual p. 39-41; 57-65; 267-278; Compton 180-182.

26. Location Stop 1: Honeycut Bend, Archer Ranch near Johnson City Stop 2: Crabapple Creek near Fredericksburg Stop 3: Hoover Point near Kingsland

27. LLano Fredericksburg Johnson City Kingsland Marble Falls 3 1 2 10 miles N

28. Geology Bastrop N 5 miles Paleozoic Sedimentary Rocks Ordovician - Pennsylvanian Carbonates Cambrian Wilberns Formation Morgan Creek Limestone member Welge Sandstone Member Riley Formation Cap Mountain Limestone member Lion Mountain Sandstone member Hickory Sandstone member

29. (Manual, p. 272)

30. Geology Inversion of Topography

31. Field Trip #2: Paleozoic Rocks Location Geology Assignment / Methods Reminders Text: Manual p. 39-41; 57-65; 267-278; Compton 180-182.

32. Assignment / Methods Assignment #1 Measure and describe Paleozoic carbonates at Honeycut Bend. Subdivide into lithostratigraphic units. Measure and Describe each unit. Work Oldest  Youngest !!!

33. Honeycut Bend

36. Grn l Pk l Wke l Mudst

37. Assignment / Methods Assignment #2 Measure & plot azimuths of paleocurrent features at Crabapple Creek. 30 crossbed sets 10 current ripple marks Determine shoreline and seaward directions.

38. Crabapple Creek

39. Assignment / Methods

40. Crabapple Creek

41. Assignment / Methods Practice: Manual p. 39-41 Plot azimuths and determine vector mean.

42. Assignment / Methods Assignment #3 Inventory features in Cambrian sediments at Hoover Point

43. Insert inventory list here (Luis Garcia) Hoover Point

44. Assignment / Methods

45. Field Trip #2: Paleozoic Rocks Location Geology Assignment / Methods Reminders Text: Manual p. 39-41; 57-65; 267-278; Compton 180-182.

46. Reminders Lab Manual Water Lunch Clipboard Pencil and Colored Pencils Ruler & Protractor Paper Brunton Rock Hammer HCl acid (provided) Hand Lens Field Notebook Raincoat Jeans