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Tertiary mammals in the Cretaceaous



I have been reading Raup's book "The Nemesis Affair."  Yes I know it's a 
tad old.  But he mentions that several Tertiary type mammals have been 
found in the Cretaceous well before the meteorite impact.  Being pretty 
clueless about early mammals, can anybody give some idea what he's 
talking about?

Thanks

Joe Daniel