Geologic map of central (interior) Alaska: Digital data

Online link https://geo-nsdi.er.usgs.gov/metadata/open-file/98-133/a/metadata.faq.html
Description This coverage represents a compilation of reconnaisance geologic mapping of the Anchorage quadrangle, Alaska.
Originators U.S. Geological Survey; Wilson, Frederic H.; Dover, J. D.; Bradley, Dwight C.; Weber, F. R.; Bundtzen, Thomas K.; and Haeussler, Peter J.
Publication U.S. Geological Survey Open-File Report 98-133a

Related topics

States or counties

cover.AAT

Lines of geologic significance

Label Definition
ARC-CODE Arc-code is a positive integer value (3 3 I) item in the arc attribute table, indicating the type of arc. Line types of geologic significance include stratigraphic contacts, faults, shorelines, ice contacts, lineaments, and alteration boundaries. Line types representing stratigraphic contacts and faults are coded differently depending on the confidence with which their characteristics are known: certain, approximate, or queried.
ARC-PARA1 Integer code used to aid symbolization of the arc, indicating characteristics of faults. Where the line indicates a thrust or high-angle reverse fault, the value is the dip of the fault plane, if known, 0 if not. Negative values indicate that the fault is overturned.
SOURCE Publication from which the base data for this feature were obtained. The values are short character strings consisting of a two-letter abbreviation for the quadrangle name and a 3-digit sequence number for the source.

cover.PAT

Polygons of geologic significance

Label Definition
CLASS Integer indicating the geologic unit used by the author of the source map (the map from which the current authors derived this overall compilation).
SOURCE Publication from which the base data for this feature were obtained. The values are short character strings consisting of a two-letter abbreviation for the quadrangle name and a 3-digit sequence number for the source. Values are as shown for SOURCE in the AAT.
NSACLASS Integer indicating the geologic unit or type of mapped feature. These units have been coded the same across all of the quadrangles in the study where it was practical to do so. As noted in the textual report, this was not always possible (further field work must be undertaken to resolve differences in concept used by the authors of the source maps).