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

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Presentation on theme: "Field Trip #3: Paleozoic Rocks II Cretaceous Stratigraphy of Central Texas."— Presentation transcript:

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

2

3 Field Trip #3: Paleozoic Rocks II Location Geology Assignment / Methods Reminders Text: Manual, p ; Compton, p ; ;

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

5 (Luis Garcia) Location Creek near Stop 2

6

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 ; Compton, p ; ;

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 ; Compton, p ; ;

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 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


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