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Re: ..not dinosaurs, but comets ...

>From the story linked to:

In response to one common criticism of the comet theory - that no craters have 
been found from an impact - West said the comet may not have actually reached 
Earth, but exploded into fragments somewhere above the surface.

Where exactly that might have happened is a mystery, but high concentrations of 
nanodiamonds at a site in Eastern Michigan suggest the Great Lakes as a 

Last year there was some talk that the "crater" might be an anomalous deep spot 
in Lake Superior(?).  Maybe that went nowhere.