1. Field Trip #3: Paleozoic Rocks II Cretaceous Stratigraphy of Central Texas

3. Field Trip #3: Paleozoic Rocks II Location Geology Assignment / Methods Reminders Text: Manual, p. 267-278; Compton, p. 166-171; 182-184; 242-243.

4. Location Hamilton Creek road cut near Max Starke Dam Stop 1 Stop 2 (E. McBride)

5. (Luis Garcia) Location Creek near Stop 2

7. Geology

8. Bastrop N 5 miles Paleozoic Sedimentary Rocks Pennsylvanian – Smithwick Shale Ordovician – Honeycut Formation of Ellenburger Group

9. (Manual, p. 272)

10. Paleozoic Events Geology Flooding by Shallow Seas Uplift Ouachita Mts (Penn) Faulting (Penn) Erosion of Ouachitas (P-J)

11. sabkha evaporites karst natural gas - subsurface Ellenburger Group Geology (nps.gov)

12. Geology Guidebook of the Geology of Travis County

13. marine high sediment supply turbidites Smithwick Shale Geology (E. McBride)

14. Field Trip #3: Paleozoic Rocks II Location Geology Assignment / Methods Reminders Text: Manual, p. 267-278; Compton, p. 166-171; 182-184; 242-243.

15. Assignment / Methods 1) Smithwick Shale Paleocurrent and Deformation Features measure and plot the orientation of: 1) joints 2) faults 3) sandstone dikes 4) fossil wood fragments 5) current ripples and solemarks

16. water-saturated sediment excess pore pressure sandstone feeder bed sandstone dike (416M) Assignment / Methods

17. clastic dikes and joints Assignment / Methods (E. McBride)

18. solemarks 416M groove casts Assignment / Methods flute casts (416M)

19. Assignment / Methods plot features in 4 rings show # of measurements show bi-directional trends

20. Assignment / Methods 2) Honeycut Formation Checklist road cut near Max Starke Dam (E. McBride)

21. limestone vs dolomite Assignment / Methods Dolomite - Thin Section Dolomite - SEM (Soil Science Society of America)

22. stylolites vs stromatolites Assignment / Methods (Luis Garcia) (Earth and Ocean Sciences at UBC)

23. fault breccia vs solution collapse breccia Assignment / Methods (Compton, p. 183) solution collapse breccia – filled cave fault breccia – repeated crushing / cementation

24. soft-sediment deformation vs brittle deformation Assignment / Methods (Compton, p. 243) faults break more resistant layers only mottled textures in shear zone

25. teepee structure and geopetal structure Assignment / Methods (Matt Campbell) Geopetal – Thin Section

26. Field Trip #3: Paleozoic Rocks II Location Geology Assignment / Methods Reminders Text: Manual, p. 267-278; Compton, p. 166-171; 182-184; 242-243.

27. Reminders Water Lunch Clipboard Colored Pencils Ruler & Protractor Extra Paper Brunton Rock Hammer HCl Acid Hand Lens Field Notebook Lab Manual

28. Field Trip #3: Paleozoic Rocks II Cretaceous Stratigraphy of Central Texas

29. Paleogeography and Sea Level Stratigraphy

30. http://www4.nau.edu/geology/master.html?http://www4.nau.edu/geology/ Late Cretaceous Paleogeography Paleogeography and Sea Level

31. Cretaceous Stratigraphy of Central Texas Paleogeography and Sea Level Stratigraphy

32. (Manual, p. 272)

33. Stratigraphy relatively flat-lying retreating escarpment (Duex and Lock, Univ. LA)

34. Stratigraphy resistant and non-resistant limestone

35. (www.cretaceousfossils.com)

36. Glen Rose Limestone Stairsteps Hensell Sand Badlands hard (pure) and soft (clay-rich) shallow subtidal and supratidal sand, conglomerate, paleosols terrestrial environment (www.cretaceousfossils.com) Stratigraphy

37. Oyster-rich Del Rio Clay pure limestone and dolomite chert-rich carbonaceous clay pyrite – anoxic lagoon Edwards Limestone “Swiss Cheese” Stratigraphy