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Penguin/geology question


in Baker et al "Multiple gene evidence for expansion
of extant penguins out of Antarctica due to global
cooling" (doi:doi:10.1098/rspb.2005.3260), the CADIC
P21 fossil is dated at 45 mya. But the original
description (Clarke et al "Description of the Earliest
Fossil Penguin from South America and First Paleogene
Vertebrate Locality of Tierra Del Fuego, Argentina")
says it's from the Leticia formation, from a layer
dating apparently equivalent to foraminiferan zone
P14. That would make it middle Bartonian, 39ish mya.

Clearly, only one can be correct. But which? What have
I missed?



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