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Re: Double impact at K-T boundary ?
There is an interesting paper on mapping the ejecta blanket of Meteor Crater in
John A. Grant and Peter H. Schultz. Erosion of Ejecta at Meteor Crater,
Arizona: Further Constraints from
Ground Penetrating Radar. LPSC XXV: 459-460.
Sorry, I don't have the pub. date. It's a Lunar and Planetary Institute
Conference pub XXV. I do have the PDF, though.
Whatever material directly overlies Meteor Crater's ejecta blanket would be of
use in this discussion. Some university should fund a graduate student and a
drill corer and see if charcoal, fern spores, burnt (fired) clay, or any other
indicators of wildfire or flash-heating can be seen near the crater (say, 1-5
km from the impact). It would provide valuable clues to how such thermal
events would be fossilized, and that data could then be used to extrapolate to
larger impact events.
Meteor Crater is an excellent subject for such a study because it is a
terrestrial structure, and it should preserve a lot of proximal-impact site
There remain lots of studies yet to be conducted on fossil impact sites.
---------- Original Message ----------
From: Lee Hall <email@example.com>
To: DML <firstname.lastname@example.org>
Subject: Re: Double impact at K-T boundary ?
Date: Wed, 1 Sep 2010 12:53:39 -0500
Is anyone aware of other impacts that have been identified by fern
spikes? Couldn't fires or volcanic fallout cause something similar?
Museum of the Rockies
Montana State University
On Tue, Aug 31, 2010 at 9:40 AM, Thomas R. Holtz, Jr. <email@example.com> wrote:
> > From: owner-DINOSAUR@usc.edu [mailto:owner-DINOSAUR@usc.edu]
> > On Behalf Of John Hunt
> > Typical DML reaction! Loads of discussion on whether Ukraine
> > should or should not be preceded by "the".
> True enough.
> > Absolutely no discussion, apart from the usual "is Shiva
> > really an impact?",
> Let's put this even more specifically: until actual geophysicists and
> structural geologists find evidence this is a crater, the default is that
> there is no there there.
> > on whether this satisfies Gerta Keller's
> > double impact theory.
> A more interesting question.
> Thomas R. Holtz, Jr.
> Email: firstname.lastname@example.org Phone: 301-405-4084
> Office: Centreville 1216
> Senior Lecturer, Vertebrate Paleontology
> Dept. of Geology, University of Maryland
> Fax: 301-314-9661
> Faculty Director, Science & Global Change Program, College Park Scholars
> Fax: 301-314-9843
> Mailing Address: Thomas R. Holtz, Jr.
> Department of Geology
> Building 237, Room 1117
> University of Maryland
> College Park, MD 20742 USA
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