Mathematics – Logic
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987geoji..89..857p&link_type=abstract
Geophysical Journal International, Vol. 89, No. 3, p. 857 - 867
Mathematics
Logic
Scientific paper
The recent findings of nearly matching long-term cyclicity in biological mass extinctions, geomagnetic reversals, impact cratering and other terrestrial processes have evoked a major controversy. The authors report a compilation and analysis of major global magmatic episodes showing a significant enhancement of volcanic activity with a periodicity of 33 million years for the last 250 million years. These magmatic episodes match extremely well the best available astronomical estimates of the periodic (31±5 Myr) galactic-disc crossing events during vertical motions of the solar system. These events also have a close linkage with the marine biological mass extinctions and other geological rhythms. It is argued that the prolonged volcanic activity, instead of impact cratering, may have been the more immediate primary cause for profound climatic and other environmental deterioration sufficient to create biological crises on a global scale.
Negi Janardan G.
Pandey Om Prakash
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