Journal
FACIES
Volume 55, Issue 2, Pages 213-225Publisher
SPRINGER
DOI: 10.1007/s10347-008-0172-2
Keywords
Palaeoichnology; Bioerosion; Rocky palaeoshores; Miocene; Tectonic evolution; Southern Portugal
Categories
Funding
- Portuguese FCT Project POCTI [32724/99]
- Spanish DGI Project [CGL200760507/BTE]
- Junta de Andalucia ( Spanish government) [RNM316]
- Fundacao para a Ciencia e a Tecnologia ( Portuguese government) [SFRH/BPD/20562/2004]
- UE founds [POCI 2010]
- Fundação para a Ciência e a Tecnologia [SFRH/BPD/20562/2004] Funding Source: FCT
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The use of rocky palaeoshore bioerosion analysis as a tool to solve stratigraphic and tectonic issues is beginning to bear fruits. The occurrence of an extensive intra-Miocene marine abrasion platform in southern Portugal at Oura (Albufeira) has been identified on the basis of bioerosion trace fossils analysis. The observed ichnodiversity is rather low, with bivalve boring Gastrochaenolites being dominant. Nevertheless, the ichnoassemblage may be assigned to the Entobia ichnofacies. The palaeoichnological study of the Oura hardground confirmed the existence of an important intra-Miocene stratigraphic gap (ca. 3 Ma hiatus), represented by a razor-sharp erosional contact that separates the two main Neogene units in the Algarvian region: the lower carbonate sequence of Lagos-PortimA o pound Formation (Langhian/Serravallian) and the upper siliciclastic sequence of the Cacela Formation (Upper Tortonian).
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