Ridge Route Formation  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Cenozoic
 ...Neogene
 ....Ridge Route Formation
RTCalifornia
 lower Pliocene
 upper Miocene
SNUpper Miocene or lower Pliocene. S California. Indexed with ages as applicable. Added to Thesaurus in 1985.