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Cretaceous loons



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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