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TABLE 1. Fossil calibrations within the waterbird assemblage.

Calibration

Node

Taxon

Specimen

Geological Context

Minimum Age

1 Phaethontidae + extant sister taxon Lithoptila abdounensis OCP.DEK/GE 1087 Bed IIa, Ouled Abdoun Basin, Morocco 56.0 Ma
2 Threskiornithidae + extant sister taxon Rhynchaeites sp. MGUH 20288 Fur Formation, NE Denmark 53.9 Ma
3 Pelecanidae + extant sister taxon Pelecanus sp. NT-LBR-039 Pichovet limestone deposits, SE France 28.1 Ma
4 Fregatidae + Suloidea Limnofregata azygosternon USNM 22753 Green River Formation, Wyoming, USA 51.81 Ma
5 Phalacrocoracidae + Anhingidae ?Borvocarbo stoeffelensis PW 2005/5022-LS Enspel Lagerstätte, W Germany 24.52 Ma