[{"clade":"Crown Balistoidei","fossil":"Oligobalistes robustus","left":"Balistes_vetula","right":"Monacanthus_tuckeri","min":"32.02","max":"66.67891892","locality":"Lower Khadum Horizon, Caucasus","authority":"Arcila et al. (2015)","age_authority":"See argumentation in Benton et al. (2015), calibration 40; specimen derives from same geological unit"}]