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Geologic map of the San Diego Quadrangle



Geologic map of the San Diego 30'x60' Quadrangle, California


California Geological Survey, Regional Geologic Map No. 3, 1:100,000 scale

Compiled by: Michael P. Kennedy and Siang S. Tan

2008

Digital preparation by: Kelly R. Bovard, Anne G. Garcia, Diane Burns and Carlos I. Gutierrez

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DESCRIPTION OF MAP UNITS
MODERN SURFICIAL DEPOSITS

Artificial fill (late Holocene) 
Wash deposits (late Holocene)
Landslide deposits, undivided (Holocene and Pleistocene)
Marine beach deposits (late Holocene)
Paralic estuarine deposits (late Holocene)
Undivided marine deposits in offshore region (late Holocene)
Canyon fill deposits in offshore region (late Holocene)
YOUNG SURFICIAL DEPOSITS
Young alluvial flood-plain deposits (Holocene and late Pleistocene)
Young colluvial deposits (Holocene and late Pleistocene)
Undivided canyon terrace deposits in offshore region (Holocene and Pleistocene)
OLD SURFICIAL DEPOSITS
Old alluvial flood-plain deposits, undivided (late to middle Pleistocene)
Old paralic deposits, undivided (late to middle Pleistocene)
Unit 7
Unit 6
Units 2-4, undivided
VERY OLD SURFICIAL UNITS
Very old alluvial flood-plain deposits, undivided (middle to early Pleistocene)
Very old paralic deposits, undivided (middle to early Pleistocene)
Unit 13
Unit 12
Unit 11a
Unit 11
Unit 10a
Unit 10
Unit 9a
Unit 9
Unit 8a
Unit 8
Unit 7
Unit 6
Unit 5
Unit 4
Unit 3
Unit 2
Unit 1
SEDIMENTARY AND VOLCANIC BEDROCK UNITS
Undivided sediments and sedimentary rocks in offshore region (Holocene, Pleistocene, Pliocene, and late Pliocene)
San Diego Formation (early Pleistocene and late Pliocene)
Tsd - undivided
Tsdcg - transitional marine and nonmarine pebble and cobble conglomerate
Tsdss - marine sandstone
Basaltic-andesite dike (Miocene
Undivided sedimentary rocks in offshore region (Miocene)
Undivided volcanic rocks in offshore region (Miocene)
Undivided volcanic and sedimentary rocks in offshore region (Miocene)
Otay Formation (late Oligocene)
Pomerado Conglomerate (middle Eocene)
Tpm - Miramar Sandstone Member
Mission Valley Formation (middle Eocene)
Stadium Conglomerate (middle Eocene)
Friars Formation (middle Eocene)
Scripps Formation (middle Eocene)
Tscu - upper unit
Ardath Shale (middle Eocene)
Torrey Sandstone (middle Eocene)
Delmar Formation (middle Eocene)
Delmar Formation and Friars Formation, undivided (middle Eocene)
Mount Soledad Formation (middle Eocene)
Tmss - sandstone
Tmsc - cobble conglomerate
Undivided Eocene rocks in offshore region (Eocene)
Cabrillo Formation (Upper Cretaceous)
Kcs - sandstone
Kccg - cobble conglomerate
Point Loma Formation (Upper Cretaceous)
Lusardi Formation (Upper Cretaceous)
Undivided rocks of the Rosario Group in the offshore area (Upper Cretaceous)
UNNAMED CRETACEOUS ROCKS OF THE PENINSULAR RANGES BATHOLITH
Granodiorite and tonalite, undivided (mid-Cretaceous)
Granodiorite, undivided (mid-Cretaceous)
Tonalite, undivided (mid-Cretaceous)
Diorite, undivided (mid-Cretaceous)
Hypabyssal rocks, undivided (mid-Cretaceous)
JURASSIC AND CRETACEOUS METAMORPHOSED AND UNMETAMORPHOSED VOLCANIC AND SEDIMENTARY ROCKS
Metamorphosed and unmetamorphosed volcanic and sedimentary rocks, undivided (Mesozoic)
Undivided metamorphic rocks in the offshore region (Mesozoic)
ONSHORE MAP SYMBOLS
Contact
Fault
Anticline
Syncline
Landslide
Strike and dip of beds
Inclined
Strike and dip of igenous joints
Inclined
Vertical
Strike and dip of metamorphic foliation
Inclined
OFFSHORE MAP SYMBOLS
Contact
Faults
Fault
Cuts strata of Holocene age
Cuts strata of late Quaternary age
Cuts strata of Quaternary age
Cuts Miocene or older strata
Fault zone
Folds
Anticline
Syncline
Channels
Active
Leeves
Landslides
Creep - Dashed where inferred
Creep - arrow indicates apparent direction of sediment movement
Slump


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