Relevo en las asociaciones de foraminíferos planctónicos del Santoniense superior al Campaniense medio de Alamedilla (Cordilleras Béticas)
- J.A. Arz
- E. Molina
ISSN: 1576-5172
Year of publication: 2001
Issue Title: XIV Congreso Nacional de Sedimentología, IV Congreso del Cretácico de España
Issue: 3
Pages: 147-150
Type: Article
More publications in: Geotemas (Madrid)
Abstract
The micropaleontological study of the Alamedilla section has allowed us to show significant planktic foraminlferal assemblage turnovers from upper Santonlan to middle Campanian. Two extinction events have been identified, closely connected with sea-level falls, across both the Santonian-Campanian boundary and the lower-middle Campanian boundary. The first extinction event coincides with an amplification of oxygen minimum zone (OAE3). The second event is related to a decrease in sea surface temperature coinciding with the LMCE event. The first appearances of certain species of planktic foraminifera are also frequent and could coincide with sea-level rises.