Monterey Formation  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Cenozoic
 ...Neogene
 ....Miocene
 .....Monterey Formation
RTCalifornia
SNMiddle and upper Miocene. Comprises (ascending) Gould Shale, Devilwater Silt, McDonald Shale, Antelope Shale, and Chico-Martinez Chert members. W California.