Assessment of taphonomic and geochemical methods in evaluating the stability of marine ecosystems during the Jurassic
Investigators from institution:
|Peter Ledvák, Jozef Michalík, Vladimír Šimo|
Co-operating institutions and scientists:
The Jurassic represents an important transition interval in the evolution of benthic and pelagic ecosystems, which remain less explored relative to the Paleozoic and Cenozoic ecosystems. The main goals are: (1) to quantify temporal and spatial variation in the species composition and to evaluate relationships between benthic and pelagic communities in the western part of the Tethys Ocean during the Late Jurassic, (2) to evaluate the robustness of the Mg/Ca paleothermometer in brachiopod shells to detect variations in seasonality, using modern brachiopods from environments with monitored changes in temperature (and to apply this method to Jurassic brachiopods), and (3) to assess the utility of taphonomic clock for inferences about the relative magnitude of time averaging in fossil assemblages (using modern accumulations of brachiopods and cephalopod shells dated with radiocarbon and amino acid racemization methods) because time averaging strongly modifies the stability values observed in fossil assemblages.