Titlebook: Geological and Biological Effects of Impact Events; Eric Buffetaut,Christian Koeberl Book 2002 Springer-Verlag Berlin Heidelberg 2002 Biod

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Cultivate

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开始从未

Effects of the Cretaceous-Tertiary Boundary Event on Bony Fishes,apse of their food chain based on plankton. No extinction of planktivorous families, the intermediate level between plankton and piscivores, is observed. This fact is explain by ecological reasons (representatives of these families were living in brackish or freshwater) and by taxonomical reasons (p

expire

,Petrographic and Geochemical Studies in the Cretaceous-Tertiary Boundary, Pernambuco — Paraíba Basion is determined by micropalaentological considerations, stable isotope data, and the presence of phosphatised fragments. Most of the particular characteristics described here, such as the geochemical anomalies (iridium, total organic carbon and fluorine) and the presence of a tsunami deposit, of po

leniency

Ostracods Prove that the Frasnian/Famennian Boundary Mass Extinction was a Major and Abrupt Crisis, from samples collected close to the Frasnian/Famennian boundary in principal reference sections all over the world. Their study shows that about 75% of all marine species disappeared abruptly close to this boundary.

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Lateral Variations in End-Permian Organic Matter in Northern Italy,stry of the oceans. The cause of these disturbances remains controversial. One valuable source of information for the end-Permian event is that contained within sedimentary organic matter. We have used organic geochemical methods to investigate end-Permian organic matter in the Dolomites of northern

侵略主义

Stable-Isotope and Trace Element Stratigraphy of the Jurassic/Cretaceous Boundary, Bosso River Gorgact structure, was found to have a radiometric age (145 Ma) indistinguishable from the stratigraphic age of the J/K boundary. Thus, it is conceivable that at the boundary, if indeed coeval with this impact structure, a record of the environmental changes associated with the impact event might exist.

关节炎

Endearing