Fordyce and friends took the [...] 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:
--92--85--falcon | `--buzzard `--49--91--oystercatcher | `--turnstone `--66--49--loon | `--54--stork | `--penguin `--99--albatross `--petrel