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Re: Mesozoic Volcanoes?
> From: Grant Harding <email@example.com>
> Does anyone here know what periods of the Mesozoic there were
>> The simple answer - all of them.
>> If you want to know what periods had *more* volcanoes than
>> typically the case, that is a different question.
And a good one. A few months ago a fellow reader of this group turned
me on to the following reference...
Stothers, R. B. 1993. Flood basalts and extinction events.
Geophysical Research Letters 20(13):1399-1402.
which included the following info...
Flood basalt Age
Columbia River 17
Deccan Traps 66
Serra Geral 133
South African 190
West African 200
Eastern N.A. 201
I left out the analytical errors and references; the ages are in
millions of years and are for the beginning of the volcanic phase,
which may go on for several million years. The Deccan Traps are at
the K-T boundary (end of the Mesozoic); the Siberian Traps are close
to the P-T boundary (beginning of the Mesozoic). Stothers uses a
semi-standard time series analysis method to show a marginally
statistically significant correlation between these volcanic episodes
and mass extinctions, but there is an error in his method (which I
believed I discussed here before), so the results are questionable.