Taxon calibrated
Crown Polyodontidae
Minimum age
63.1 Ma
Maximum 95% CI age
177.6 Ma
Authority
Grande & Bemis (1991); Puercan NALMA date from GTS2012
Locality
Tullock Formation, Montana, USA
Age Authority
Puercan NALMA, age estimate derived from Gradstein et al. (2012)
Outgroup sequence
Polyodon tuberculata (Crown Polyodontidae, 63.1 Ma)
Protopsephurus luii (Crown Chondrostei, 120.8 Ma)
Peipiaosteus pani (stem Chondrostei 3, 129.3 Ma)
Chondrosteus acipenseroides (stem Chondrostei 2, 193.81 Ma)
Birgeria groenlandica (stem Chondrostei 1, 250.1 Ma)
Taxa this fossil might apply to:
Family: Polyodontidae
Order: Acipenseriformes