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Re: Double impact at K-T boundary ?

There's also the Manson Impact Structure in Iowa.  This paper
(http://www.montana.edu/wwwes/facstaff/Manson.pdf) has a pretty good
dissection of the MIS' morphology.

Lee Hall
Paleontology Undergraduate
Museum of the Rockies
Montana State University
Bozeman, MT

On Wed, Sep 1, 2010 at 4:28 PM, Phillip Bigelow <bigelowp@juno.com> wrote:
> Lee Hall <paleeoguy@gmail.com> writes:
>> Is anyone aware of other
>> impacts that have been identified
>> by fern spikes?  Couldn't fires
>> or volcanic fallout cause something
>> similar?
> I vaguely recall a palynological paper, published about a decade ago, in 
> which the investigator identified approximately a dozen fern spikes within a 
> 10 meter-thick stratigraphic section.  The section was randomly chosen.
> Moral of the story:  By themselves, fern spikes are not indicators of 
> impacts, but when other pieces of evidence are combined with the palynology 
> data, then the spikes may help identify an environmental reaction to an 
> impact.
> I'll see if I can dig up that paper....
> <pb>
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