[{"clade":"Crown Polyodontidae","fossil":"Polyodon tuberculata","left":"Polyodon_spathula","right":"Psephurus_gladius","min":"63.1","max":"177.6873874","locality":"Tullock Formation, Montana, USA","authority":"Grande & Bemis (1991); Puercan NALMA date from GTS2012","age_authority":"Puercan NALMA, age estimate derived from Gradstein et al. (2012)"}]