Quoting David Marjanovic <david.marjanovic@gmx.at>:
Fordyce and friends took the 60 to 62 Ma of *Waimanu manneringi*
(determined by traditional geological methods -- it's in a Danian
layer) as the date of the divergence between Sphenisciformes and...
whatever their molecular tree gives as the closest living relative.
Storks (bizarrely), followed by loons and procellariiforms:
http://mbe.oxfordjournals.org/cgi/data/msj124/DC1/1
--
Nick Pharris
Department of Linguistics
University of Michigan
"Creativity is the sudden cessation of stupidity."
--Edwin H. Land