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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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slide1

Field Trip #3: Paleozoic Rocks II

Cretaceous Stratigraphy of Central Texas

slide3

Field Trip #3: Paleozoic Rocks II

  • Location
  • Geology
  • Assignment / Methods
  • Reminders

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

slide4

Location

Hamilton Creek

Stop 1

(E. McBride)

Stop 2

road cut near Max Starke Dam

(E. McBride)

slide5

Location

Creek near Stop 2

(Luis Garcia)

slide8

Geology

Paleozoic Sedimentary Rocks

Pennsylvanian – Smithwick Shale

Ordovician – Honeycut Formation of Ellenburger Group

Bastrop

N

5 miles

slide10

Geology

Paleozoic Events

  • Flooding by Shallow Seas
  • Uplift Ouachita Mts (Penn)
  • Faulting (Penn)
  • Erosion of Ouachitas (P-J)
slide11

Geology

Ellenburger Group

  • sabkha
  • evaporites
  • karst
  • natural gas - subsurface

(nps.gov)

slide12

Geology

Guidebook of the Geology of Travis County

slide13

Geology

Smithwick Shale

  • marine
  • high sediment supply
  • turbidites

(E. McBride)

slide14

Field Trip #3: Paleozoic Rocks II

  • Location
  • Geology
  • Assignment / Methods
  • Reminders

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

slide15

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
slide16

sandstone feeder bed

sandstone dike

(416M)

Assignment / Methods

  • water-saturated sediment
  • excess pore pressure
slide17

Assignment / Methods

clastic dikes and joints

(E. McBride)

(E. McBride)

slide18

groove casts

Assignment /

Methods

flute casts

(416M)

solemarks

(416M)

416M

slide19

Assignment /

Methods

  • plot features in 4 rings
  • show # of measurements
  • show bi-directional trends
slide20

Assignment / Methods

2) Honeycut Formation Checklist

road cut near Max Starke Dam

(E. McBride)

slide21

Assignment / Methods

limestone

vs

dolomite

Dolomite - Thin Section

Dolomite - SEM

(Soil Science Society of America)

(Soil Science Society of America)

slide22

(Earth and Ocean Sciences at UBC)

(Luis Garcia)

Assignment / Methods

stylolites

vs

stromatolites

slide23

(Compton, p. 183)

Assignment / Methods

fault breccia

vs

solution collapse breccia

  • solution collapse breccia – filled cave
  • fault breccia – repeated crushing / cementation
slide24

Assignment / Methods

soft-sediment deformation

vs

brittle deformation

(Compton, p. 243)

  • faults break more resistant layers only
  • mottled textures in shear zone
slide25

Assignment / Methods

teepee structure

and

geopetal structure

Geopetal – Thin Section

(Matt Campbell)

slide26

Field Trip #3: Paleozoic Rocks II

  • Location
  • Geology
  • Assignment / Methods
  • Reminders

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

slide27

Reminders

  • Brunton
  • Rock Hammer
  • HCl Acid
  • Hand Lens
  • Field Notebook
  • Lab Manual
  • Water
  • Lunch
  • Clipboard
  • Colored Pencils
  • Ruler & Protractor
  • Extra Paper
slide28

Field Trip #3: Paleozoic Rocks II

Cretaceous Stratigraphy of Central Texas

slide29

Cretaceous Stratigraphy of Central Texas

  • Paleogeography and Sea Level
  • Stratigraphy
slide30

Paleogeography and Sea Level

Late Cretaceous Paleogeography

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

slide31

Cretaceous Stratigraphy of Central Texas

  • Paleogeography and Sea Level
  • Stratigraphy
slide33

Stratigraphy

(Duex and Lock, Univ. LA)

  • relatively flat-lying
  • retreating escarpment
slide34

Stratigraphy

  • resistant and non-resistant limestone
slide36

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

slide37

Stratigraphy

Edwards Limestone “Swiss Cheese”

  • pure limestone and dolomite
  • chert-rich

Oyster-rich Del Rio Clay

  • carbonaceous clay
  • pyrite – anoxic lagoon