Mathematics – Logic
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998piase.107..251b&link_type=abstract
Proc. Indian Acad. Sci., Earth Planet. Sci., Vol. 107, No. 4, p. 251 - 263
Mathematics
Logic
Earth: Impact Phenomena
Scientific paper
The boundary horizons of the Cretaceous-Tertiary, the Permo-Triassic and the Eocene-Oligocene have been identified in the sedimentary records of the Indian subcontinent. These sections have been studied for geochemical anomalies. The results are discussed in the framework of extra-terrestrial and terrestrial causes proposed to explain the physical, chemical and mineralogical observations at these boundaries. A critical analysis suggests that although the astronomical causes, particularly the bolide impacts, can easily explain the geochemical and physical changes, the terrestrial causes (volcanism) may have played a significant role in creating the biological stress observed in fossil records (mass extinction) at or near some of these boundaries.
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