field trip #3: paleozoic rocks ii cretaceous stratigraphy of central texas
TRANSCRIPT
420K, 2006, Trip 3 – Paleozoic Rocks II
SATURDAY, March 4 SUNDAY, March 5 Ben’s Lab Crossy’s Lab 1 2 3 4 5 6 7 8 9 10 11 12
AL AWAMI; AHMED BENSCH; CATY LAVONNE FISHER; FRANK J. FRANCIS; LUKE KENNETH GREENE; LAUREN ELAINE PAPE; JAMES RUSSELL PINKSTON; DANIEL PATRICK RANDALL; BLAKE ANDREW RAWLINGS; COREY BROOKS STRYK; COURTNEY RENEE TURPIN; SARAH ASHLEY WALKER; ISABELLE NEWTON
1 2 3 4 5 6 7 8 9 10 11 12
ALBUTAIRI; FAHAD EMAD A CARLIN; JOSEPH PATRICK CORNELIUS; MELODY ANNE DUERSON; APRIL C. HOWARD; MELISSA ANN JOHNSON; BRANDON EVERETT KATERNDAHL; TIFFANY ANNE MOOTE; ERIC PAUL OCHOA; CARLOS EDUARDO RUSSO; MATT STEPHEN SCHEY; BJORN THOMAS WHITE; PHILLIP KYLE
Thomas’ Lab (Ryan) Ryan’s Lab (Thomas) 13 14 15 16 17 18 19 20 21 22 23 24 25 26
AHMED; SUMIYYAH COLLINS; ANA CRISTINA DLUBAC; KATHERINE ISIS DOROBEK; RUSSELL EDWARD GARBER; JOSHUA MICHAEL HERON; BRETANI REBECCA HEWLETT; ALICIA CHRISTINE KWONG; CALVIN KA-FEI LEE; PATRICIA LIN LLADO; LESLIE ELISABETH MATHIAS; WHITNEY DANIELLE NIKMANESH; PARNIA WICKMAN; TERRANCE JOSEPH WILSON; ALEXANDER COALE
13 14 15 16 17 18 19 20 21 22 23 24 25 26 27
BEHRMAN; DEREK LAINE CHATFIELD; TOMMY LOYD COLEMAN; JOSEPH MACDONALD DE LEON; RYAN JOSEPH DICKERSON; TYLER ANDREW FLY; STERLING HARPER IV FREYTAG; DALE ROSS PICKELL; MICHAEL JOHN STACKHOUSE; STANLEY B. STANLEY; BLAIR AVANT STRONG; BRYAN JORDAN THOMPSON; JEFFREY ALAN TREVINO; RICHARD JAMES TURNER; ANDREW VAVOURAKIS; CONSTANTINE J
------------------------------------------------------------------------------------------------------------ Extra Saturday Extra Sunday 27 BAITIS; ELKE ELISE 28 SKELTON; CHRISTINA M. 28 29 30
CHRISTIANSON; PERRY A. AL-JOHAR; MISHAL MANSOUR KING; WILLIAM PRENTICE
29 30
SWANSON; TRAVIS ERIC KNOWLES; JENNIFER NICOLLE
Field Trip #3: Paleozoic Rocks II
• Location
• Geology
• Assignment / Methods
• Reminders
Text: Manual, p. 267-278; Compton, p. 166-171; 182-184; 242-243.
Geology
Bastrop
N
5 miles
Paleozoic Sedimentary Rocks
Pennsylvanian – Smithwick Shale
Ordovician – Honeycut Formation of Ellenburger Group
Paleozoic Events
Geology
• Flooding by Shallow Seas
• Uplift Ouachita Mts (Penn)
• Faulting (Penn)
• Erosion of Ouachitas (P-J)
Field Trip #3: Paleozoic Rocks II
• Location
• Geology
• Assignment / Methods
• Reminders
Text: Manual, p. 267-278; Compton, p. 166-171; 182-184; 242-243.
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
• water-saturated sediment
• excess pore pressure
sandstone feeder bed
sandstone dike
(416M)
Assignment / Methods
Assignment / Methods
• plot features in 4 rings
• show # of measurements
• show bi-directional trends
limestone
vs
dolomite
Assignment / Methods
Dolomite - Thin Section
Dolomite - SEM
(Soil Science Society of America)
(Soil Science Society of America)
fault breccia
vs
solution collapse breccia
Assignment / Methods
(Compton, p. 183)
• solution collapse breccia – filled cave
• fault breccia – repeated crushing / cementation
soft-sediment deformation
vs
brittle deformation
Assignment / Methods
(Compton, p. 243)
• faults break more resistant layers only
• mottled textures in shear zone
teepee structure
and
geopetal structure
Assignment / Methods
(Matt Campbell)
Geopetal – Thin Section
Field Trip #3: Paleozoic Rocks II
• Location
• Geology
• Assignment / Methods
• Reminders
Text: Manual, p. 267-278; Compton, p. 166-171; 182-184; 242-243.
Reminders
• Water
• Lunch
• Clipboard
• Colored Pencils
• Ruler & Protractor
• Extra Paper
• Brunton
• Rock Hammer
• HCl Acid
• Hand Lens
• Field Notebook
• Lab Manual
http://www4.nau.edu/geology/master.html?http://www4.nau.edu/geology/
Late Cretaceous Paleogeography
Paleogeography and Sea Level
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