Late Cretaceous to Quaternary Strata and Fossils of Texas: Field Excursions Celebrating 125 Years of GSA and Texas Geology, GSA South-Central Section Meeting, Austin, Texas, April 2013
This volume, prepared in conjunction with the 47th Annual Meeting of the GSA South-Central Section, contains four guides that focus on sedimentology and paleontology in Texas. A theme of exploration threads its way through the trips, all of which can trace their roots to the work of early geologic explorers. One trip retraces part of the 1889 Dumble survey that explored the geology along the Colorado River between Austin and La Grange, Texas, while another takes readers to an internationally famous Quaternary vertebrate paleontology site, studied since the beginning of the twentieth century, inside Friesenhahn Cave in the central Texas Hill Country. Another guide visits Paleocene- to Eocene-age sediments derived from the Rocky Mountains and transported via rivers to the Houston Embayment, building out the continental shelf, while a fourth explores Late Cretaceous Gulf Series strata in the Dallas area.
Depositional history of the upper Calvert Bluff and lower Carrizo formations, Bastrop, Texas
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Published:January 01, 2013
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CiteCitation
Thomas E. Yancey, Andrew Dunham, Kevin Durney, 2013. "Depositional history of the upper Calvert Bluff and lower Carrizo formations, Bastrop, Texas", Late Cretaceous to Quaternary Strata and Fossils of Texas: Field Excursions Celebrating 125 Years of GSA and Texas Geology, GSA South-Central Section Meeting, Austin, Texas, April 2013, Brian B. Hunt, Elizabeth J. Catlos
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ABSTRACT
This field trip examines exposures of transgressive and highstand marine deposits of the Sabinetown transgression that forms the upper part of the Calvert Bluff Formation of the Wilcox Group in the outcrop belt. The horizon of maximum flood in the Sabinetown transgression at Bastrop contains molluscs and diverse vertebrate fossils characteristic of open marine environments. The highstand deposits coarsen upward and are capped with a well-developed paleosol. These deposits are dated as early Eocene.
- Bastrop County Texas
- biogenic structures
- bioturbation
- Calvert Bluff Formation
- Carrizo Sand
- Cenozoic
- charcoal
- chemically precipitated rocks
- Chordata
- correlation
- Eocene
- field trips
- highstands
- Invertebrata
- ironstone
- lower Eocene
- marine environment
- marine sedimentation
- middle Eocene
- Mollusca
- paleoenvironment
- Paleogene
- paleosols
- sea-level changes
- sedimentary rocks
- sedimentary structures
- sedimentation
- sequence stratigraphy
- teeth
- Tertiary
- Texas
- transgression
- United States
- Vertebrata