Geologic map and map database of the Spreckels 7.5-minute quadrangle, Monterey County, California

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Description This digital map database, compiled from previously published and unpublished data, and new mapping by the authors, represents the general distribution of bedrock and surficial deposits in the mapped area.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 (skmf.tx
Originators Clark, Joseph C.; Brabb, Earl E.; Rosenberg, Lewis I.; Goss, H. V.; and Watkins, Sarah E.
Publication U.S. Geological Survey Miscellaneous Field Studies Map 2349

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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,
"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.
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

This report, skmf.txt, skmf.pdf, or


polygon attribute table

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


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.


Attribute table of SK-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.


Attribute table of SK-STRC.

Label Definition
LTYPE The type of fold axis or other structural linear feature that does not bound geologic units. Faults are described in a separate coverage, but some contacts are described in this coverage.
PLUNGE Database item added in order to plot plunge arrows on plunging fold axes.


Attribute table of SK-LNDS.

Label Definition
PTTYPE Feature observed at this point