1. Geoscience Data Catalog

Geologic map of the Christian quadrangle, Alaska

Online link https://geo-nsdi.er.usgs.gov/metadata/open-file/00-192/metadata.faq.html
Description This data set represents reconnaissance geologic mapping of the Christian quadrangle, Alaska. It is used to create the mapsheet in USGS OFR 00-192, which shows bedrock and surficial deposits of the 1:250,000 scale Christian quadrangle in northern Alaska.
Originators Brosgé, William P. and Reiser, Hans N.
Publication U.S. Geological Survey Open-File Report 00-192

Related topics

Bedrock geologic units, Geologic maps, Geologic structure, Geology, Geospatial datasets, Surficial geologic units, GeoscientificInformation

States or counties

Alaska

Overview of attributes

The Geologic Map of Clayhole Wash and Vicinity, Mohave County,
Northwestern Arizona includes four geospatial datasets as ARC/INFO
coverages: cwpoly (geology), cwfold (folds, basalt flow lines),
cwdip (point data including strike and dip, collapse features,
sinkholes, and volcanic vents), and cwanno (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 cwpoly includes the following feature attribute tables:
(a) a polygon feature attribute table (cwpoly.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 (cwpoly.aat) that describes the contacts and
linear features that bound rock-unit polygons.  For display purposes, the
cwpoly coverage includes an annotation class which contains line types and
arcmarker symbols derived from the coded items LTYPE and PTTYPE respectively.
(2) The coverage cwfold includes an arc feature attribute table
(cwfold.aat) that describes linear features (folds and basalt flow lines).
For display purposes, the cwfold 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 cwdip includes the following: (a) a point feature attribute
table (cwdip.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 from item STRIKE.
(b) Cwdip also contains annotation for fault offsets, and dip values.
(4) The coverage cwanno, containing subclass anno.unit, is used to
annotate geologic unit labels.  The unit labels were derived from the coded
item PTYPE in the coverage cwpoly.

http://pubs.usgs.gov/mf/2002/2394/cwgeo.pdf

CWPOLY.PAT

Attribute table of CWPOLY

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

CWPOLY.AAT

Attribute table of CWPOLY

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

CWFOLD.AAT

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

CWDIP.PAT

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.