Mon, Nov. 16, 1998 , Gautam Majumdar writes:
>Date: Mon, 16 Nov 1998 19:55:44 +0000
>Subject: Re: Isotopic Evidence for the K - T
Impactor and Its Type
certainly heard suggestions that at least one mid-Cenozoic crater
>>known of comparable magnitude.
work showed that the Chicxulub crater was about 100 km is
>The prominent 175-190 km feature is actually a fault scarp.
Thus its size is
>comparable to both Popigai (100 km) and Chesapeake
Bay (85 km) impact
>craters (both 35-36 mya) which were not associated
with any extinction event.
>Morgan J, Warner M & The Chicxulub
Working Group, Size and morphology
>of the Chicxulub impact crater,
Nature 1997; 390: 472-76
>Melosh H J, Multi-ringed revelation,
Nature 1997; 390: 439-40
>Stoffler D, Claeys P, Earth rocked by
combination punch, Nature 1997; 388:
>Kerr R A,
Chesapeake Bay Impact Crater Confirmed, Science 1995;
PS, Don`t forget that other crater...the "Shiva Crater"
mentioned by Chatterjee as a possible simultaneous impact (with the
Chixalube). He gives it`s dimensions as 600 km long and 450km wide! (unless
of course you want to "scale that down" a bit)?