Mon, Nov. 16, 1998 , Gautam Majumdar writes:
>Date: Mon, 16 Nov 1998 19:55:44 +0000
>From: Gautam Majumdar <email@example.com>
>Subject: Re: Isotopic Evidence for the K - T Impactor and Its Type
>Stanley Friesen <firstname.lastname@example.org> wrote
>>have certainly heard suggestions that at least one mid-Cenozoic crater is
>>known of comparable magnitude.
>Recent work showed that the Chicxulub crater was about 100 km is diameter.
>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; 269:
>Gautam Majumdar email@example.com
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)?