Cretaceous δ13C stratigraphy and the age of dolichosaurs and early mosasaurs
| Autor: | Kurt M. Ferguson, Michael J. Polcyn, C. Rennison, Louis L. Jacobs |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
0106 biological sciences
Ammonite 010506 paleontology biology Haasiasaurus Geology Mosasaur biology.organism_classification 010603 evolutionary biology 01 natural sciences Dallasaurus language.human_language Cretaceous Sedimentary depositional environment Paleontology Tethysaurus language Cenomanian 0105 earth and related environmental sciences |
| Zdroj: | Netherlands Journal of Geosciences. 84:257-268 |
| ISSN: | 1573-9708 0016-7746 |
| DOI: | 10.1017/s0016774600021041 |
| Popis: | Sediments in north-central Texas, ranging in age from >117 to 85 Ma, represent a variety of terrestrial and marine depositional settings. Isotopic analyses of wood fragments found throughout the section allow correlation to the standard secular marine δ13C curve because of characteristic peaks at the Aptian-Albian and Cenomanian-Turonian boundaries. Consistency of the north-central Texas δ13C curve with the marine standard facilitates correlation among non-marine and marine environments on a global scale. Radiometrically dated ammonite zones recognised in Texas provide calibration for the Cenomanian and Turonian portions of the section. Cenomanian and Turonian sediments in north-central Texas preserve the oldest (96 Ma) and the youngest (Coniasaurus, a dolichosaur also known from the southern North Sea Basin during that interval. Haasiasaurus, the oldest known well-documented early mosasaur, is found at ‘Ein Yabrud, Israel (98 Ma), followed by other poorly dated Cenomanian taxa from the eastern Mediterranean region, and then by Dallasaurus turneri and Russellosaurus coheni in Texas (92 Ma) and Tethysaurus (90.5 Ma) in Morocco. Neither shifts in δ13C nor large-scale sea level change seem to have influenced dolichosaur or mosasaur evolution in substantial ways during the Cenomanian and Turonian stages. |
| Databáze: | OpenAIRE |
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