0
-7,000-4,000
-500
1,000
5,00012,000
Elevation, in feet,NAVD88
Volcanic (onshore) and undivided sedimentary and volcanic rocks (offshore)
MioceneMetavolcanic and Metasedimentary Rocks (Mesozoic)
Santiago Peak VolcanicsUndivided
Crystalline Rocks (Mesozoic)
MetamorphicIntrusive
Undivided Sedimentary DepositsQuaternary
Water
Undivided Sedimentary RocksPlio-Pleistocene (San Diego Formation)
Oligocene (Otay Formation)Miocene
EoceneCretaceous
Geology
EXPLANATION
Tecate Creek
Creek
Campo
Sa n Die gu
ito R .
YsabelCreek
San
Diego River
Otay River
Sweetwater
River
Santa
River
Tijuana
wood
Cotton
Cree
k
Carlsbad Canyon
Islas De LosCoronados
La Jolla Canyon
Coronado Bank
El CapitanLake
UpperOtay Lake
San VicenteReservoir
MorenaReservoir
LakeCuyamaca
BarrettLake
LakeSutherlandLake
Hodges
LovelandReservoir
Lower OtayLake
SweetwaterReservoir
El CarrizoReservoir
Aberardo L.Rodriguez Dam
SaltonSea
San Diego Trough
Fault — Selected faults from multiple sources. Solid where accurately located, dashed where approximately located, dotted where concealed.
Pacif icO
cean
United States
Mexico Baja CaliforniaCalifornia
Pe
ni
ns
ul
ar
Ra
ng
e
Study areaboundary
C o l o r a d o R i v e r H y d r o l o g i c Re
gi o
n
MountainsSan Ysidro
Laguna Mountains
Riverside County
San Diego C
ountyIm
perial County
Colorized elevation model base from U.S. Geological Surveydigital elevation data, 1/3 arc-second resolution
0 20 MILES
0
10
10 20 KILOMETERS
117°30’ 117°00’ 116°30’ 116°00’
33°00’
32°30’
Surficial geology of San Diego-Tijuana area, USA and Mexico (Cromwell, unpublished).
San DiegoEmbayment
Santee
La Mesa
El Cajon
San Diego
Chula Vista
Tijuana
Tecate
National City
Rosarito
Escondido
Oceanside
Del Mar
La Jolla
Poway
Encinitas Julian
Campo
Study area
CALIFORNIA U.S.A.