Tqs
Quatal Formation, sandstone facies (Pliocene)
QTm
Morales Formation (Pleistocene and Pliocene)
Qls
Landslide deposits (Holocene)
Tqcl
Quatal Formation, clay-rich facies (Pliocene)
Qac
Very young alluvium and colluvium (Holocene)
Qoac
Old alluvium and colluvium (Pleistocene)
Tqc
Quatal Formation, conglomerate facies (Pliocene)
Tqw
Quatal Formation, white sandstone facies (Pliocene)
Tcc
Caliente Formation, conglomerate facies (Miocene)
Tlc
Lockwood Clay (Pliocene?)
Tcgr
Caliente Formation, granitic breccia facies (Miocene)
Tca
Caliente Formation, arkosic-lithic sandstone facies (Miocene)
Qoa
Old alluvium (Pleistocene)
Tqg
Quatal Formation, gypsum (Pliocene)
Qyac
Young alluvium and colluvium (Holocene and Pleistocene?)
Qaa
Active alluvium (Holocene)
Qa
Very young alluvium (Holocene)
Tjm
Juncal Formation, interbedded sandstone, siltstone, and shale facies (Eocene)
Tjsh
Juncal Formation, siltstone and shale facies (Eocene)
Tma
Matilija Sandstone (Eocene)
Qya
Young alluvium (Holocene and Pleistocene?)
af
Artificial fill (Holocene)
Tmam
Matilija Sandstone, interbedded sandstone and shale facies (Eocene)
Tqx
Quatal Formation, sedimentary breccia facies (Pliocene)
Tc?
Caliente Formation, uncertain (Miocene)
Tqgr
Quatal Formation, granitic breccia facies (Pliocene)
Tcd
Cozy Dell Shale (Eocene)
Trd
Rhyolitic intrusions (Oligocene)
Tcds
Cozy Dell Shale, sandstone (Eocene)
Qols
Old landslide deposit (Pleistocene?)
Tcw?
Coldwater Sandstone, uncertain (Eocene)
Ts
Sespe Formation (Eocene)
Tjs
Juncal Formation, sandstone facies (Eocene)
Tsms
Santa Margarita Formation, sandstone and mudstone (Miocene)
Tsmg
Santa Margarita Formation, gypsum (Miocene)
Tm
Monterey Formation (Miocene)
Tms
Monterey Formation, sandstone (Miocene)