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Field Trip #3: Paleozoic Rocks II PowerPoint PPT Presentation


Field Trip #3: Paleozoic Rocks II. Cretaceous Stratigraphy of Central Texas. Field Trip #3: Paleozoic Rocks II. Location Geology Assignment / Methods Reminders. Text: Manual, p. 267-278; Compton, p. 166-171; 182-184; 242-243. . Location. Hamilton Creek. Stop 1. (E. McBride).

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Field Trip #3: Paleozoic Rocks II

Cretaceous Stratigraphy of Central Texas


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Field Trip #3: Paleozoic Rocks II

  • Location

  • Geology

  • Assignment / Methods

  • Reminders

Text: Manual, p. 267-278; Compton, p. 166-171; 182-184; 242-243.


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Location

Hamilton Creek

Stop 1

(E. McBride)

Stop 2

road cut near Max Starke Dam

(E. McBride)


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Location

Creek near Stop 2

(Luis Garcia)


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Geology


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Geology

Paleozoic Sedimentary Rocks

Pennsylvanian – Smithwick Shale

Ordovician – Honeycut Formation of Ellenburger Group

Bastrop

N

5 miles


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(Manual, p. 272)


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Geology

Paleozoic Events

  • Flooding by Shallow Seas

  • Uplift Ouachita Mts (Penn)

  • Faulting (Penn)

  • Erosion of Ouachitas (P-J)


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Geology

Ellenburger Group

  • sabkha

  • evaporites

  • karst

  • natural gas - subsurface

(nps.gov)


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Geology

Guidebook of the Geology of Travis County


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Geology

Smithwick Shale

  • marine

  • high sediment supply

  • turbidites

(E. McBride)


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Field Trip #3: Paleozoic Rocks II

  • Location

  • Geology

  • Assignment / Methods

  • Reminders

Text: Manual, p. 267-278; Compton, p. 166-171; 182-184; 242-243.


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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


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sandstone feeder bed

sandstone dike

(416M)

Assignment / Methods

  • water-saturated sediment

  • excess pore pressure


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Assignment / Methods

clastic dikes and joints

(E. McBride)

(E. McBride)


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groove casts

Assignment /

Methods

flute casts

(416M)

solemarks

(416M)

416M


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Assignment /

Methods

  • plot features in 4 rings

  • show # of measurements

  • show bi-directional trends


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Assignment / Methods

2) Honeycut Formation Checklist

road cut near Max Starke Dam

(E. McBride)


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Assignment / Methods

limestone

vs

dolomite

Dolomite - Thin Section

Dolomite - SEM

(Soil Science Society of America)

(Soil Science Society of America)


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(Earth and Ocean Sciences at UBC)

(Luis Garcia)

Assignment / Methods

stylolites

vs

stromatolites


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(Compton, p. 183)

Assignment / Methods

fault breccia

vs

solution collapse breccia

  • solution collapse breccia – filled cave

  • fault breccia – repeated crushing / cementation


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Assignment / Methods

soft-sediment deformation

vs

brittle deformation

(Compton, p. 243)

  • faults break more resistant layers only

  • mottled textures in shear zone


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Assignment / Methods

teepee structure

and

geopetal structure

Geopetal – Thin Section

(Matt Campbell)


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Field Trip #3: Paleozoic Rocks II

  • Location

  • Geology

  • Assignment / Methods

  • Reminders

Text: Manual, p. 267-278; Compton, p. 166-171; 182-184; 242-243.


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Reminders

  • Brunton

  • Rock Hammer

  • HCl Acid

  • Hand Lens

  • Field Notebook

  • Lab Manual

  • Water

  • Lunch

  • Clipboard

  • Colored Pencils

  • Ruler & Protractor

  • Extra Paper


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Field Trip #3: Paleozoic Rocks II

Cretaceous Stratigraphy of Central Texas


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Cretaceous Stratigraphy of Central Texas

  • Paleogeography and Sea Level

  • Stratigraphy


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Paleogeography and Sea Level

Late Cretaceous Paleogeography

http://www4.nau.edu/geology/master.html?http://www4.nau.edu/geology/


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Cretaceous Stratigraphy of Central Texas

  • Paleogeography and Sea Level

  • Stratigraphy


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(Manual, p. 272)


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Stratigraphy

(Duex and Lock, Univ. LA)

  • relatively flat-lying

  • retreating escarpment


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Stratigraphy

  • resistant and non-resistant limestone


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(www.cretaceousfossils.com)


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Stratigraphy

  • hard (pure) and soft (clay-rich)

  • shallow subtidal and supratidal

(www.cretaceousfossils.com)

Hensell Sand Badlands

  • sand, conglomerate, paleosols

  • terrestrial environment

Glen Rose Limestone Stairsteps


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Stratigraphy

Edwards Limestone “Swiss Cheese”

  • pure limestone and dolomite

  • chert-rich

Oyster-rich Del Rio Clay

  • carbonaceous clay

  • pyrite – anoxic lagoon


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