[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
Re: Siberian Traps
> Update on the possible Falkland craters.
Funny. Rampino told us, in the lecture Catastrophic Geology last summer, very
much about the P-Tr mass extinction; all the braided rivers, the fungal
spike, the cyclostratigraphy that shows that in Austria the extinction cannot
have lasted longer than 8,000 years, the radiolarite in Japan that suddenly
ends and is overlain by a black shale, the fullerenes, the gigantic Siberian
traps (which _could_ be a little older than the extinction, or was that
younger...), the carbon cycle modeling in which turning off life produces the
well-known carbon isotope excursion, his own opinion that an impact as the
cause is likely though the evidence isn't too great yet, but he didn't say
anything about craters in Falkland. He did mention the crater in Brazil which
is decidedly too small (150 km diameter IIRC) to have triggered such an
extinction on its own.