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Chicxulub crater

Dear All, 

I've been reading up on the critiques of the asteroid impact hypothesis
for the sole cause of the K-T extinction.  I've come across a 1994
reference which refers to a 1960s well drilling into the Chicxulub
{spelling?} crater that is interpreted as showing it can't be an impact
crater of any kind.  Also, examination of 2 Deep Sea Drilling Project
cores from sites that are the closest to this crater confirm non-impact
signatures.  The crater is also shown to be the wrong time, with late
Cretaceous sediments overlying the actual depression.

Is there any other post -1994 reference that refutes or confirms these
findings?  Is there any other crater considered a worthy candidate for
the supposed K-T extinction event? (i.e. the right *size* and the right

I'm not fully convinced there was an impact, after immersing myself in
critiques.  This crater was the best candidate, but the 1994 reference
says no.  Not being a geologist by trade, I find myself very confused. 
If anyone can enlighten me with newer references, please do so!  

I'm trying to pursue this in a scientifically rigorous, skeptical manner,
so that I can present a balanced view of the topic "what killed the
dinosaurs?" for the summer volunteers at our museum. Thanks!

Judy Molnar
Education Associate, Virginia Living Museum
All questions are valid; all answers are tentative.