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| Format: | Artículo científico |
| Language: | en |
| Published: |
Universitat de Barcelona
2014
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| Online Access: | https://www.redalyc.org/articulo.oa?id=50530452002 |
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Table of Contents:
- Depositional sequences and ammonoid assemblages in the upper Cenomanian-lower Santonian of the Iberian Peninsula (Spain and Portugal) M. Segura F. Barroso Barcenilla P. Callapez J.F. García Hidalgo J. Gil Gil Ciencias de la Tierra Spain Portugal lower Santonian Upper Cenomanian Ammonoid assemblages A clear relationship exists between eustatic sea-level rises and falls recorded as cyclical depositional sequences and ammonite faunas during the Cenomanian-Santonian in the Iberian and West Portuguese basins. Most of the faunal turnovers correlate with stratigraphic intervals related to marine transgressions, maximum flooding of the shelf (locally associated to anoxic events), and marine regressions. Specifically, within each depositional sequence, three distinct and identical events of morphological change occur, involving ammonoids belonging to different groups. Transgressive sediments are characterized by moderately ornamented, inflated and evolute morphologies, which are replaced by smooth, involute and compressed oxycones (the most hydrodynamic shells) during maximum flooding (and to a lesser extent at the early highstand) of the sequences. The latter morphologies in turn are replaced by coarsely ornamented and evolute shells during late highstands. We conclude that ammonoid faunal analysis can be used to trace sea-level changes and provides an additional tool for sequence stratigraphy. 2014 artículo científico 1695-6133 https://www.redalyc.org/articulo.oa?id=50530452002 en http://www.redalyc.org/revista.oa?id=505 Geologica Acta: an international earth science journal application/pdf Universitat de Barcelona Geologica Acta: an international earth science journal (España) Num.1 Vol.12