Digital geologic map and map database of parts of Marin, San Francisco, Alameda, Contra Costa, and Sonoma Counties, California

Online link https://geo-nsdi.er.usgs.gov/metadata/map-mf/2337/metadata.faq.html
Description This digital map database, compiled from previously published and unpublished data, and new mapping by the authors, represents the general distribution of bedrock and surficial deposits in the mapped area. Together with the accompanying text file (mageo.t
Originators Blake, M. Clark, Jr.; Graymer, Russell W.; Jones, D. L.; and Soule, A.
Publication U.S. Geological Survey Miscellaneous Field Studies Map MF-2337

Related topics

States or counties

Overview of attributes

The databases in this report were compiled in ARC/INFO, a commercial
Geographic Information System (Environmental Systems Research
Institute, Redlands, California).  Almost all the attributes in the
various attribute tables of the coverages included in the report are
set or calculated by Arc/Info.  The exceptions are "coveragename"-ID,
LTYPE, PTYPE, PTTYPE, BKTYPE, SAMPNO, STRIKE, and DIP.
"coveragename"-ID is required by internal policy to be sequential.
This ensures the highest compatibility of our databases with other GISs.
Therefore "coveragename"-ID is calculated equal to "coveragename"#,
which is a unique, sequential integer assigned by Arc/Info to each
data record.
LTYPE, PTYPE, and PTTYPE are author added items to the coverage AAT
or PAT that are used to describe the type of line (LTYPE), area (PTYPE),
or point (PTTYPE) being recorded.  All coverages with AAT and PAT
present include these items in the data structure, although in some
cases these items are not used.  Each has WIDTH 35, OUTPUT 35, TYPE C.
BKTYPE is an author added item that contains information about the
type of rock observed at a certain point.  It has WIDTH 2, OUTPUT 2,
TYPE C.  This item is only recorded in the table MA-BLKS.PAT
STRIKE and DIP are author added items to the coverage PAT that record
information about the orientation of planar geologic structures.  Both
have WIDTH 3, OUTPUT 3, TYPE I.  These items are only recorded in the
table MA-STRC.PAT

This report, madb.txt, madb.pdf, or madb.ps AND mageo.txt, mageo.pdf, or mageo.ps

MA-GEOL.PAT

polygon attribute table

Label Definition
PTYPE Labels of geologic units and areas of water.

MA-GEOL.AAT

arc attribute table

Label Definition
LTYPE The type of lines used in the geology layer. Includes all faults, as well as lines bounding polygons that define geologic units.

MA-STRC.PAT

Attribute table of MA-STRC.

Label Definition
PTTYPE The type of planar feature which was observed and the orientation of which was measured at this point.
DIP The inclination of planar structures measured in degrees down from horizontal.
STRIKE The orientation of a horizontal line in an inclined planar structure measured in degrees clockwise from north.

MA-STRC.AAT

Attribute table of MA-STRC.

Label Definition
LTYPE The type of fold axis or other structural linear feature that does not bound geologic units. Faults and contacts are described in a seperate coverage.

MA-BLKS.PAT

Attribute table of MA-BLKS.

Label Definition
PTTYPE Type of melange block observed at this point
BKTYPE More detailed information about the type of melange block observed at this point.

MA-ALTR.PAT

Attribute table of MA-ALTR.

Label Definition
PTYPE Designates areas of hydrothermal alteration

MA-ALTR.AAT

Attribute table of MA-ALTR.

Label Definition
LTYPE Type of line

MA-QUAD.PAT

Attribute table of MA-QUAD.

Label Definition
PTYPE Used to delineate areas of water in the mapped area

MA-QUAD.AAT

Attribute table of MA-QUAD.

Label Definition
LTYPE Type of line recorded in the quadrangle index coverage.

MA-CORR.PAT

Attribute table of MA-CORR.

Label Definition
PTYPE Labels of geologic units and areas of water.

MA-CORR.AAT

Attribute table of MA-CORR.

Label Definition
LTYPE Type of line used in the correlation chart

MA-SO.PAT

Attribute table of MA-SO.

Label Definition
PTYPE The index number of the area labeled that relates to the sources of data as shown in the explanation sheet plotfile (maexpl.ps or maexpl.pdf) or in Lineage:Source Information: above.

MA-SO.AAT

Attribute table of MA-SO.

Label Definition
LTYPE Type of line used in the Sources of Data Index Map coverage

MA-TERR.PAT

Attribute table of MA-TERR.

Label Definition
PTYPE Symbol for mapped tectonostratigraphic terrane and areas of water

MA-TERR.AAT

Attribute table of MA-TERR.

Label Definition
LTYPE The type of line in the terrane map.