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By Martire L. (Ed.)

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Additional resources for 6th International Symposium on the Jurassic System, September 12-22 2002, Palermo. Abstracts and program

Sample text

We discuss new geochemical data that (1) reveal a highly plausible cause for the environmental changes and (2) directly link the initiation of this cause to the marine stratigraphical record. We have determined the Re and Os abundances, and Os isotope compositions, of marine mudrocks that span the Triassic-Jurassic boundary at St. Audrie's Bay (proposed Tr-J boundary GSSP), Watchet Harbour, and Lavernock Point, in the UK and have established that major isotopic and geochemical shifts in the composition of seawater took place in the latest Triassic (Cohen & Coe 2002).

The first step is a preliminary inventory of sites with geological relevance, emphasizing the relation between landscape, history and geology. , 1995). In this extensional episode, the Lusitanian Basin was re-organized in several fault-bounded sub-basins; the Caldas da Rainha fault separated the blocks of Bombarral (east) and Péniche, both tilted toward east. Extensional tectonics and long-term sea level rise lead to onlaping deposition of middle and late Oxfordian lacustrine and shallow marine carbonates over Callovian.

The studied sequence is capped by a hard-ground. All recorded bivalves are suspension-feeders. Byssate epifaunal bivalves are represented by Plagiostoma fiiersichi and Ctenostreon proboscideum, most specimens preserved as articulated internal moulds with remnants of shell, some of them fragmented. ) cingulatum, usually preserved as single valves displaying shell preservation. External and internal moulds are also occasionally recorded. ) rathieriana, mainly articulated internal moulds with remnants of shell.

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