Geologic Map of Upper Clayhole Valley and Vicinity, Mohave County, Northwestern Arizona

Online link https://geo-nsdi.er.usgs.gov/metadata/map-mf/2418/metadata.faq.html
Description This digital map database is compiled from unpublished data and new mapping by the authors and represents the general distribution of surficial and bedrock geology in the mapped area. Together with the accompanying pamphlet, it provides current informatio
Originators Billingsley, George H. and Priest, Susan S.
Publication U.S. Geological Survey Miscellaneous Field Studies Map MF-2418

Related topics

States or counties

Overview of attributes

The Geologic Map of Upper Clayhole Valley and Vicinity, Mohave County,
Northwestern Arizona includes four geospatial datasets as ARC/INFO
coverages: cv_poly (geology), cv_fold (folds, basalt flow lines),
cv_dip (point data including strike and dip, collapse features,
sinkholes, and volcanic vents), and cv_anno (annotation and geologic
unit labels).  Geospatial entities in ARC/INFO coverages have the
following software-defined attributes: <cover>.pat contains AREA,
PERIMETER, COVER#, and COVER-ID; <cover>.aat contains FNODE#, TNODE#,
LPOLY#, RPOLY#, LENGTH, COVER#, and COVER-ID.  User-defined attributes
are described in detail below.
(1) The coverage cv_poly includes the following feature attribute tables:
(a) a polygon feature attribute table (cv_poly.pat) that describes the
geospatial distribution of surficial units represented in the Postscript
(.eps) and Portable Document Format (.pdf) plotfiles of the map.  (b) an
arc feature attribute table (cv_poly.aat) that describes the contacts and
linear features that bound rock-unit polygons.  For display purposes, the
cv_poly coverage includes an annotation class which contains line types and
arcmarker symbols derived from the coded items LTYPE and PTTYPE respectively.
(2) The coverage cv_fold includes an arc feature attribute table
(cv_fold.aat) that describes linear features (folds and basalt flow lines).
For display purposes, the cv_fold coverage includes an annotation class which
contains line types and arcmarker symbols derived from the coded items LTYPE
and PTTYPE respectively.  Arrowheads indicating plunging folds are drawn
based on values in the coded item PLUNGE.
(3) The coverage cv_dip includes the following: (a) a point feature attribute
table (cv_dip.pat) that describes the position of point data including strike
and dips, collapse features, sinkholes, and volcanic vents.  Symbols are
derived from the item PTTYPE, dip angle in degrees is derived from item DIP,
and strike angle in degrees is in item STRIKE.  (b) cv_dip also contains
annotation for dip values.
(4) The coverage cv_anno, containing subclass anno.unit, is used to
annotate geologic unit labels and fault offsets.  The unit labels are
derived from the coded item PTYPE in the coverage cv_poly.

http://pubs.usgs.gov/mf/2003/2418/cvgeo.pdf

CV_POLY.PAT

Polygon attribute table of coverage

Label Definition
PTYPE Geologic map unit label. Plain text is substituted for conventional geologic age symbols (TR for Triassic) shown on map.

CV_POLY.AAT

Arc attribute table of coverage

Label Definition
LTYPE Type of geologic or geographic feature denoted by a line in the database.
PTTYPE arc marker point type

CV_FOLD.AAT

Arc attribute table of coverage

Label Definition
LTYPE Type of geologic or geographic feature denoted by a line in the database.
PTTYPE Arc marker point type

CV_DIP.PAT

Point attribute table of coverage

Label Definition
PTTYPE The type of planar feature which was observed and the orientation of which was measured at this location.
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.