Kwps
Williams Formation, Pleasants Sandstone Member
Qls
Landslide deposits
Ktrl
Trabuco Formation, fanglomerate
Qyls
Young landslide deposits
Qya
Young axial channel deposits
Ts
Sespe Formation
Jbc
Bedford Canyon Formation
Tt
Topanga Formation
Qls?
Landslide deposits, queried
Qyfsa
Qyf!lin.3;       sa
Young alluvial fan deposits, silty sand
Qyfa
Qyf!lin.3;       a
Young alluvial fan deposits, arenaceous
Ktru
Trabuco Formation, conglomerate
Klbc
Ladd Formation, Baker Canyon Conglomerate Member
Kvsp
Santiago Peak Volcanics
Tv
Vaqueros Formation
Tsi
Silverado Formation
Tsa
Santiago Formation
Qvoa
Very old axial channel deposits
Kwsr
Williams Formation, Schulz Ranch Member
Tco
Capistrano Formation, Oso Member
Tplv
Puente Formation, La Vida Member
Tm
Monterey Formation
Tsis
Silverado Formation, Serrano clay
Qaf
Artificial fill
Qsw
Slope wash deposits
Tpsq
Puente Formation, Soquel Member
Qvoa1
Qvoa!lin.3;          1
Very old axial channel deposits, Unit 1
Tn
Niguel Formation
Qvoa1?
Qvoa!lin.3;         1?
Very old axial channel deposits, Unit 1, queried
Klhs
Ladd Formation, Holz Shale Member
Qyls?
Young landslide deposits, queried
Qvofga
Qvof!lin.3;        ga
Very old alluvial fan deposits, gravelly sand
Kvspi
Intrusive rocks associated with Santiago Peak Volcanics
Qycsa
Qyc!lin.3;      sa
Young colluvial deposits, silty sand
Qvoa2
Qvoa!lin.3;         2
Very old axial channel deposits, Unit 2
Qyaa
Qya!lin.3;       a
Young axial channel deposits, arenaceous
Qyag
Qya!lin.3;       g
Young axial channel deposits, gravel
Qyfga
Qyf!lin.3;       ga
Young alluvial fan deposits, gravelly sand
Ktr
Trabuco Formation
Kc
Carbonate-silicate rock
Ks
Serpentinite
Qof3a
Qof!lin.3;       3a
Old alluvial fan deposits, Unit 3, arenaceous
Klhsc
Ladd Formation, Holz Shale Member, sandstone and conglomerate
Kwps?
Williams Formation, Pleasants Sandstone Member, queried
Santiago Reservoir
Qywa
Qyw!lin.3;       a
Young wash deposits, arenaceous
Tvs
Vaqueros and Sespe Formations, undifferentiated
Kwsr?
Williams Formation, Schulz Ranch Sandstone Member, queried
Qyaga
Qya!lin.3;        ga
Young axial channel deposits, gravelly sand
Jbm
Bedford Canyon Formation, marble and limestone
Qyasa
Qya!lin.3;       sa
Young axial channel deposits, silty sand
Qycsa?
Qyc!lin.3;        sa?
Young colluvial deposits, silty sand, queried
Qvofa
Qvof!lin.3;         a
Very old alluvial fan deposits, arenaceous
Kt
Tonalite, undifferentiated, Peninsular Ranges batholith
Qywg
Qyw!lin.3;       g
Young wash deposits, gravel
Qvoa5
Qvoa!lin.3;         5
Very old axial channel deposits, Unit 5
Qvoa3
Qvoa!lin.3;         3
Very old axial channel deposits, Unit 3
Qvoa4
Qvoa!lin.3;         4
Very old axial channel deposits, Unit 4
Qc
Colluvial deposits
Qvoa!lin.3;         1
Qoa
Old axial channel deposits
Kd
Diorite, undifferentiated, Peninsular Ranges batholith
Qvoa!lin.3;        2
Qvoaga
Qvoa!lin.3;          ga
Very old axial channel deposits, gravelly sand
Qvoa!lin.3;        3
Kwps1
Kwps!lin.3;        1
Williams Formation, Pleasants Sandstone Member, conglomeratic sandstone
Tsicg
Silverado Formation, basal conglomerate
Tp
Puente Formation
Qsw?
Slope wash deposits, queried