An integrated study (geochemistry, stable oxygen and carbon isotope, nannofossils, planktonic foraminifera, inoceramiid bivalves, ammonites, and crinoide of the Waxahachie Dam Spillway, north Texas: a possible boundary stratotype for the base of the Campanian

The spillway of Lake Waxahachie, Ellis County (Texas), exposes a >17 m section of the Hutchins Member of the Austin Chalk Group, unconformably overlain by Taylor Clay. The Austin sequence was regarded as a potential Global Stratotype Section for the base of the Campanian Stage at the 1995 Brussel...

Full description

Bibliographic Details
Published in:Cretaceous Research
Main Authors: A. S. Gale, J. M. Hancock, W. J. Kennedy, A. J. Lees, I. Walaszczcyk, D. S. Wray, M. R. Petrizzo
Other Authors: J. M.Hancock
Format: Article in Journal/Newspaper
Language:English
Published: 2008
Subjects:
Campanian
Foraminifera
Geochemistry
Inoceramid
Isotope
Nannofossils
Settore GEO/01 - Paleontologia e Paleoecologia
Austin
Planktonic foraminifera
Online Access:http://hdl.handle.net/2434/48578
https://doi.org/10.1016/j.cretres.2007.04.006
Description
Summary:The spillway of Lake Waxahachie, Ellis County (Texas), exposes a >17 m section of the Hutchins Member of the Austin Chalk Group, unconformably overlain by Taylor Clay. The Austin sequence was regarded as a potential Global Stratotype Section for the base of the Campanian Stage at the 1995 Brussels meeting on Cretaceous Stage boundaries, with the last occurrence of the crinoid Marsupites testudinarius (von Schlotheim, 1820) as the potential boundary marker. An integrated study of the geochemistry, stable carbon and oxgen isotopes, nannofossils, planktonic foraminifera, inoceramid bivalves, ammonites and crinoids of this section place the last occurrence of M. testudinarius in a matrix of eighteen ancillary biostratigraphic markers, while the boundary can also be recognised on the basis of a δ13C excursion that can, in principle, be detected globally in marine sediments. A new forma of the crinoid Marsupites testudinarius is introduced. The Waxahachie section fulfils sufficient geological criteria as to be an excellent candidate GSSP for the base of the Campanian Stage, if problems of ownership and access to the section can be resolved.

Similar Items