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Regional (1:250,000-Scale) Geologic and Geophysical Maps  

 

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

Alturas Lassen, Modoc, Shasta, Siskiyou

GAM 1

OFR 89-11

BGA 1

Bakersfield Fresno, Inyo, Kern, Kings, San Luis Obispo, Tulare

GAM 2

OFR 89-24

BGA 2

Chico Butte, Colusa, El Dorado, Glenn, Nevada, Placer, Plumas, Sierra, Tehama, Yuba

RGM 7A (5 sheets)

OFR 87-03

 N/A
Death Valley Inyo

GAM 4

OFR 89-21

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

GAM 5

OFR 89-20

 N/A
Kingman Inyo, San Bernardino N/A

OFR 87-05

BGA 6

Long Beach Los Angeles, Orange

GAM 7

OFR 89-13

BGA 7

Los Angeles Kern, Los Angeles, San Bernardino, San Luis Obispo, Ventura GAM 8

OFR 89-22

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

GAM 9

OFR 89-25

 N/A
Needles Riverside, San Bernardino

GAM 10

 N/A N/A
Redding Humboldt, Shasta, Tehama, Trinity

GAM 11

OFR 89-02

BGA 11

Sacramento Alpine, 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 Sea Inyo, Riverside, San Bernardino

GAM 13

OFR 88-15

 N/A
San Bernardino Kern, Los Angeles, San Bernardino

RGM 3A (5 sheets)

AMM 3

BGM 3

San Diego-El Centro Imperial, San Diego

GAM 15

OFR 88-09

 N/A
San Francisco/San Jose Alameda, 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 Obispo Fresno, Kern, Kings, Monterey, San Luis Obispo, Santa Barbara

GAM 18

OFR 89-08

 N/A
Santa Ana Imperial, 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 Maria San Luis Obispo, Santa Barbara

GAM 21

OFR 89-09

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

RGM 2A (5 sheets)

AMM 2

BGM 2

Trona Inyo, Kern, San Bernardino N/A

OFR 87-05

 N/A
Ukiah Butte, Colusa, Glenn, Humboldt, Lake, Mendocino, Tehama, Trinity

GAM 25

OFR 89-10

 N/A
Walker Lake Alpine, El Dorado, Mono, Tuolumne

GAM 26

OFR 89-23

 N/A
Weed Del Norte, Humboldt, Shasta, Siskiyou, Trinity

RGM 4A (4 sheets)

AMM 4

BGA 27

Westwood (Susanville) Butte, Lassen, Plumas, Shasta, Tehama N/A

OFR 88-17

 N/A