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Re: causes of K-T ferns

>From MB:

>such as an impact by a meteor, or a small comet or whtaever it could have

According to Frank Kyte (Nature v. 396, 1998, pp. 237-39), who analyzed what
he believed was a piece of the K/T impactor, it was a carbonaceous chondrite
(aka, a stony meteorite).

And from TH:

>(not piddly little bumps like Chixculub...)<

Obviously some tongue in cheek on that, but it's worth noting that,
according to the American Geophysical Union, Chixculub is perhaps one of the
largest craters produced in the inner solar system in the last 4 billion