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Re: Double impact at K-T boundary ?



Is anyone aware of other impacts that have been identified by fern
spikes?  Couldn't fires or volcanic fallout cause something similar?


Lee Hall
Paleontology Undergraduate
Museum of the Rockies
Montana State University
Bozeman, MT
lhall@montana.edu
http://sites.google.com/site/leehallpaleo/Home



On Tue, Aug 31, 2010 at 9:40 AM, Thomas R. Holtz, Jr. <tholtz@umd.edu> 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: tholtz@umd.edu   Phone: 301-405-4084
> Office: Centreville 1216
> Senior Lecturer, Vertebrate Paleontology
> Dept. of Geology, University of Maryland
> http://www.geol.umd.edu/~tholtz/
> Fax: 301-314-9661
>
> Faculty Director, Science & Global Change Program, College Park Scholars
> http://www.geol.umd.edu/sgc
> 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
>