Université de Fribourg

The filament event near the Cenomanian-Turonian boundary in Tunisia: filament origin and environmental signification

Negra, Mohamed Hédi ; Zagrarni, Mohamed Faouzi ; Hanini, Amine ; Strasser, André

In: Bulletin de la Société Géologique de France, 2011, vol. 182, no. 6, p. 507-519

Near the Cenomanian-Turonian boundary, the filament event corresponds to the massive occurrence of thin elongate shells, probably bivalves which constitute, in the Bahloul Formation, about 40% of allochems. This biosedimentary event was described in several areas, such as in Tunisia, Algeria, Morocco, North America, Oman and Tibet. In Tunisia, filaments are well represented within well laminated...

Université de Fribourg

The paleoecological significance of nerineoid mass accumulations from the Kimmeridgian of the Swiss Jura Mountains

Waite, Richard ; Wetzel, Andreas ; Meyer, Christian A. ; Strasser, André

In: Palaios, 2008, vol. 23, no. 8, p. 548-558

The Kimmeridgian shallow-water carbonates of the Swiss Jura Mountains display stratigraphic levels containing mass accumulations of nerineoidean gastropods. The macro- and microfacies of the rocks with these nerineoidean assemblages suggest that their occurrence was related to water depth, physical energy within the habitat, sedimentation rate, substrate stability, and food supply. Typical...

Université de Fribourg

Origin of peloids in Early Cretaceous deposits, Dorset, South England

Samankassou, Elias ; Tresch, Jonas ; Strasser, André

In: Facies, 2005, vol. 51, p. 264

Peloids are ubiquitous components in modern and fossil carbonates. The term peloid is non-genetic because the origin of these grains and the pathways of their formation are not fully understood. Based on Berriasian material originating from Dorset, southern England, we report here on peloids that result from the more or less in-place breakdown of previously micritized bivalve shells. The...