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Title: Depositional sequences and ammonoid assemblages in the upper Cenomanianlower Santonian of the Iberi
Authors: Segura, M.
Barroso-Barcenilla, F.
Callapez, P. 
García-Hidalgo, J. F.
Gil-Gil, J.
Keywords: Depositional sequences; Ammonoid assemblages; Upper Cenomanian-lower Santonian; Spain; Portugal
Issue Date: 2014
Publisher: Universitat de Barcelona
Project: PEII11-0237-7926 of the Junta de Castilla-La Mancha 
CGL2008-03112, CGL2009-12008 and CGL2011-25894 of the Ministerio de Ciencia e Innovación, Spain 
Serial title, monograph or event: Geologica Acta
Issue: 17
Abstract: 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 the 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 shells, 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, which 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 provide an additional tool for sequence stratigraphy.
ISSN: 16956133
DOI: 10.1344/105.000002056
Rights: openAccess
Appears in Collections:FCTUC Ciências da Terra - Artigos em Revistas Internacionais

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