Journal
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
Volume 292, Issue 1-2, Pages 35-43Publisher
ELSEVIER
DOI: 10.1016/j.palaeo.2010.03.023
Keywords
Bioerosion; Trypanites ichnofacies; Endolithic communities; Transgressive surface; Disconformity; Miocene; Burdigalian
Funding
- Ministry of Science and Technology of Spain [JCI-2008-2431]
- Junta de Andalucia (Spanish government)
- Portuguese Fundacao para a Ciencia e Tecnologia [PTDC/MAR/102800/2008]
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A well preserved bioeroded surface occurs at the unconformity separating Cretaceous limestones and Lower Miocene sediments, outcropping on the western coast of the Peninsula of Setubal (Central West Portugal) The ichnoassemblage present in this bioeroded surface is herein assigned to the Trypanites ichnofacies. The preservation characteristics of the borings reflect several episodes of encrustation/boring and physical erosion The erosional truncation of bioerosive structures, and the predominant preservation of the largest borings (Gastrochaenolites isp) in the ichnocoenoses are herein related with repeated phases of bioerosion and physical abrasion occurred during an Early Miocene transgressive pulse The recognition of this bioeroded transgressive surface also allowed confirming the presence, at that time, of an emergent topographic relief related to salt domes formed earlier, probably already during Palaeogene times. (C) 2010 Elsevier BV All rights reserved
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