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125 Years of Science for America - 1879 to 2004
U.S. Geological Survey
Open-File Report 2004-1361

Preliminary Geologic Map of the El Cajon 30' x 60' Quadrangle, Southern California

Compiled by Victoria R. Todd

Digital preparation by Rachel M. Alvarez and TGS, Techni Graphic Systems, Inc.

2004

thumbnail image of map

The El Cajon quadrangle is one of about 20 1:100,000-scale topographic quadrangles in southwestern California being mapped and compiled by geologists of the U.S. Geological Survey and California Geological Survey as part of the Southern California Areal Mapping Project (SCAMP) and STATEMAP. Sources used for compilation of the El Cajon quadrangle include unpublished mapping at 1:24,000 scale, and unpublished reconnaissance mapping.

This report consists of a geologic map, a brief regional synthesis, and descriptions of map units. Geologic interpretations were aided by U-Pb ages for plutonic and volcanic rocks determined by D.L. Kimbrough, G.H. Girty, and C.T. Herzig at San Diego State University. Plutonic rock names were assigned based upon modal analyses and the International Union of Geological Sciences rock classification (Streckeisen, 1973).

 

 

File Name
File Type and Description
File Size
DATA FILES
el_cajon.zip
 compressed file of the digital database for this map
7.2-MB file that opens into a 29.4-MB folder
FILES FOR VIEWING AND PLOTTING
ec1_map.zip
 A zipped Encapsulated Postscript file for viewing and plotting the geologic map at full scale. The plot is approximately 40 x 32 inches in size
10.2-MB file that opens into a 34.6 MB file
ec1_map.pdf
 A Portable Document Format (PDF) file for viewing and plotting the geologic map at full scale. The plot is approximately 40 x 32 inches in size.
9 MB
ec1_cmu.zip
 A zipped Encapsulated Postscript file for viewing and plotting the correlation of map units and abbreviated description of map units, approximately 26 x 28 inches in size.
772-KB file that opens into a 7.5-MB file
ec1_cmu.pdf
 A Portable Document Format (PDF) file for viewing and plotting the correlation of map units and abbreviated description of map units, approximately 26 x 28 inches in size.
284 KB
ec1_pamphlet.pdf
 A Portable Document Format (PDF) file for viewing and printing a pamphlet that accompanies the map. The pamphlet contains a geologic interpretation and the description of map units.
672 KB
README
ec1_readme.txt
 text version of readme that explains how to use the digital database
12 KB
METADATA
ec1_met.txt
 Federal Geographic Data Committee (FGDC) compliant metadata file derived from the digital database.
40 KB
SYMBOLS
symbols.zip
 which includes:
  • geoscamp2.lin - Lineset for lines
  • geoscamp2.mrk - Markerset for points
  • wpgcmykg.shd - Shadeset for colors
  • geology2.shd - Shadeset for patterns
  • fnt026 - Font required for geoscamp2.lin
  • fnt037 - Font required for geoscamp2.mrk
  • fnt035 - Font required for geology2.shd
  • geoage - folder contains files for Geoage font group
    • 184-KB file that opens into a 1.2-MB folder

    Version history

    For questions about the content of this report, contact Rachel Alvarez

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    | Help | PDF help | Publications main page | Open-File Reports for 2004 |
    | Privacy Statement | Disclaimer | Accessibility |
    | Geologic Division | Southern California Areal Mapping Project (SCAMP) |
    This report is available only on the Web

    | Department of the Interior | U.S. Geological Survey |
    URL of this page: http://pubs.usgs.gov/of/2004/1361/
    Maintained by: Michael Diggles
    Created: October 29, 2004
    Last modified: October 29, 2004 (mfd)