Cretaceous loons

["Ken Kinman" <kinman@hotmail.com>]

    Is there any credible published information that loons (Gaviidae) 
actually existed in the Cretaceous?  Neogaeornis may be a hesperornithiform.
    Doesn't that just leave Polarornis?  Is there anything besides the 
shape of the cnemial crest and skull (both subject to convergence) that are 
known to link Polarornis with loons?  Have any experts besides Chatterjee 
studied it?  Is there any indication in what decade Polarornis might be 
finally be described, so that the gaviid "claims" can be scientifically 
tested?  Wasn't it discovered in the 1980's?
      ----- Thanks,  Ken

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