| Autor: |
Eustoquio Molina, Walter Alvarez, José A. Arz, J.M. Grajales-Nishimura, Antonio Camargo-Zanoguera, Carmen Rosales-Domínguez, Gustavo Murillo-Muñetón, Ignacio Arenillas |
| Rok vydání: |
2006 |
| Předmět: |
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| Zdroj: |
Earth and Planetary Science Letters. 249:241-257 |
| ISSN: |
0012-821X |
| DOI: |
10.1016/j.epsl.2006.07.020 |
| Popis: |
High-resolution and quantitative planktic foraminiferal biostratigraphy from two SE Mexico stratigraphic sections (Bochil, Guayal) shows that the Chicxulub-related Complex Clastic Unit (CCU) is synchronous with the ejecta-rich airfall layer and the Cretaceous/Paleogene (K/Pg) catastrophic mass extinction horizon in the El Kef (Tunisia) and Caravaca (Spain) sections. The lowermost Danian H. holmdelensis subzone (= Biozone P0) was identified in both sections in a thin dark clay bed just above the CCU, proving that such bed is chronostratigraphically equivalent to the K/Pg boundary clay of the El Kef stratotype. These new micropaleontogical data confirm that the K/Pg impact event and the Chicxulub impact event are the same one. This contradicts the suggestion by others that the Chicxulub impact predated the K/Pg boundary by about 300 ka. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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