[{"clade":"Crown Chondrostei","fossil":"Protopsephurus luii","left":"Polyodon_spathula","right":"Acipenser_transmontanus","min":"120.8","max":"233.770971","locality":"Yixian Formation, China","authority":"See Benton et al. (2015)","age_authority":"See argumentation in Benton et al. (2015), calibration 26"},{"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)"}]