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Product Codes (Prices are listed in CGS's publications database)

Geologic Atlas Maps (GAM) : 1:250,000-scale geologic maps that show California geology in time-stratigraphic units. Originally statewide in scope, these maps have a unified legend and color scheme.

Regional Geologic Maps (RGM) : 1:250,000-scale geologic maps with individually tailored legends. Typically these maps are more detailed than GAM products. Map colors of common units typically do not vary from sheet to sheet, but identical colors may be used for different formations on different sheets.

Aeromagnetic Maps (AMM) : Aeromagnetic contours superimposed on RGM color geologic maps.

Bouguer Gravity Maps (BGA) : Bouguer Gravity contours superimposed on GAM color geologic maps.

Bouguer Gravity Maps (BGM) : Bouguer Gravity contours superimposed on RGM color geologic maps.

Open-File Reports (OFR) : Aeromagnetic contours on a black and white planimetric base.

N/A: Not available or out of print.

 

Map Sheet

Counties Covered

Publication Number

Geologic Map

Aeromagnetic Map

Gravity Map

AlturasLassen, Modoc, Shasta, Siskiyou

GAM 1

OFR 89-11

BGA 1

BakersfieldFresno, Inyo, Kern, Kings, San Luis Obispo, Tulare

GAM 2

OFR 89-24

BGA 2

ChicoButte, Colusa, El Dorado, Glenn, Nevada, Placer, Plumas, Sierra, Tehama, Yuba

RGM 7A (5 sheets)

OFR 87-03

N/A
Death ValleyInyo

GAM 4

OFR 89-21

N/A
FresnoFresno, Inyo, Kings, Madera, Tulare

GAM 5

OFR 89-20

N/A
KingmanInyo, San BernardinoN/A

OFR 87-05

BGA 6

Long BeachLos Angeles, Orange

GAM 7

OFR 89-13

BGA 7

Los AngelesKern, Los Angeles, San Bernardino, San Luis Obispo, VenturaGAM 8

OFR 89-22

N/A
MariposaFresno, Inyo, Madera, Mariposa, Monterey, Tuolumne

GAM 9

OFR 89-25

N/A
NeedlesRiverside, San Bernardino

GAM 10

N/AN/A
ReddingHumboldt, Shasta, Tehama, Trinity

GAM 11

OFR 89-02

BGA 11

SacramentoAlpine, Amador, Calaveras, Contra Costa, Colusa, El Dorado, Placer, Sacramento, San Joaquin, Solano, Sutter, Tuolumne, Yolo, Yuba

RGM 1A
(4 sheets)

AMM 1

BGM 1

Salton SeaInyo, Riverside, San Bernardino

GAM 13

OFR 88-15

N/A
San BernardinoKern, Los Angeles, San Bernardino

RGM 3A (5 sheets)

AMM 3

BGM 3

San Diego-El CentroImperial, San Diego

GAM 15

OFR 88-09

N/A
San Francisco/San JoseAlameda, Calaveras, Contra Costa, Madera, Marin, Mariposa, Merced, San Joaquin, Santa Clara, San Francisco, San Mateo, Santa Cruz, Stanislaus, Tuolumne

RGM 5A

AMM 5, OFR 87-03

BGA 16

San Luis ObispoFresno, Kern, Kings, Monterey, San Luis Obispo, Santa Barbara

GAM 18

OFR 89-08

N/A
Santa AnaImperial, Los Angeles, Orange, Riverside, San Bernardino, San Diego

GAM 19

OFR 88-08

BGM 19
Santa Cruz (Monterey)Fresno, Kings, Madera, Merced, Monterey, San Benito, Santa Clara, Santa Cruz

GAM 20

OFR 88-07

BGA 20

Santa MariaSan Luis Obispo, Santa Barbara

GAM 21

OFR 89-09

N/A
Santa RosaContra Costa. Colusa, Lake, Marin, Mendocino, Napa, Solano, Sonoma, Yolo

RGM 2A (5 sheets)

AMM 2

BGM 2

TronaInyo, Kern, San BernardinoN/A

OFR 87-05

N/A
UkiahButte, Colusa, Glenn, Humboldt, Lake, Mendocino, Tehama, Trinity

GAM 25

OFR 89-10

N/A
Walker LakeAlpine, El Dorado, Mono, Tuolumne

GAM 26

OFR 89-23

N/A
WeedDel Norte, Humboldt, Shasta, Siskiyou, Trinity

RGM 4A (4 sheets)

AMM 4

BGA 27

Westwood (Susanville)Butte, Lassen, Plumas, Shasta, TehamaN/A

OFR 88-17

N/A