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Re: Double impact at K-T boundary ?

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....


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