Original paper

The role of taphonomic features in the palaeoecological interpretation of Eocene carbonates from the Adriatic carbonate platform (PgAdCP)

Ćosović, Vlasta; Drobne, Katica; Ibrahimpašić, Haris

Abstract

The preservation conditions of larger benthic foraminifera from the Lutetian Foraminiferal Limestones from Lavsa Island, Kornat Archipelago (Adriatic Sea, Croatia) were examined in order to provide a description of the taphonomic signature and a semi-quantitative estimation of test degradation in thin section analysis. Taphonomic alteration of alveolinid, nummulitid and orthophragminid tests includes borings, encrustation, fragmentation and abrasion. Alveolinid tests displayed the greatest mechanical damage. Furthermore, boring was found more often within orthophragminids and nummulitids than in alveolinids. Encrustation equally affected orthophragminids and alveolinids, although different encrusting organisms were involved. Transport of foraminiferal tests from inner- and middle ramp settings into the surrounding deeper photic, low energy setting resulted in abrasion and fragmentation of Alveolina sp., robust Nummulites sp. and orthophragminids. This study shows that microtaphofacies analysis can be used to refine the architectural model of the Paleogene Adriatic carbonate platform.

Keywords

lutetianpaleogene adriatic carbonate platformadriatic sealarger benthic foraminiferaencrustationfragmentationabrasionbioerosiontaphonomic alternation