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Re: causes of K-T ferns

In a message dated 5/22/01 8:03:02 PM EST, KELL00BELL@aol.com writes:

<< An alternative source of iridium--volcanism--has also 
 been confirmed, whereas the link between such evidence and impacts is 
 probably mostly conjectural. >>

The isotope ratio in the iridium more closely matches that in 
extraterrestrial sources rather than that in terrestrial volcanism. The 
people who proposed an extraterrestrial source for the iridium did their 
homework in this respect.