Open-File Report 99-317
Online Version 1.0

These digital databases are the result of the compilation and reinterpretation of published and unpublished 1:250,000- and 1:63,360-scale mapping. The map area covers approximately 62,000 sq km (23,000 sq mi) in land area and encompasses much of 13 1:250,000-scale quadrangles on the Alaska Peninsula in southwestern Alaska. The compilation was done as part of the U.S. Geological Survey's Alaska Mineral Resource Assessment project (AMRAP), whose goal was create and assemble geologic, geochemical, geophysical, and other data in order to perform mineral resource assessments on a quadrangle, regional or statewide basis. The digital data here was created to assist in the completion of a regional mineral resource assessment of the Alaska Peninsula.

Mapping on the Alaska Peninsula under AMRAP began in 1977 in the Chignik and Sutwik Island 1:250,000 quadrangles (Detterman and others, 1981). Continued mapping in the Ugashik, bristol bay, and northwestern Karluk quadrangles (Detterman and others, 1987) began in 1979, followed by the Mount Katmai, eastern Naknek, and northwestern Afognak quadrangles (Riehle and others, 1987; Riehle and others, 1993), the Port Moller, Stepovak bay, and Simeonof Island quadrangles (Wilson and others, 1995) beginning in 1983. Work in the Cold bay and False Pass quadrangles (Wilson and others, 1992 [Superceded by Wilson and others 1997, but not incorporated herein]) began in 1986.

The reliability of the geologic mapping is variable, based, in part, on the field time spent in each area of the map, the available support, and the quality of the existing base maps. In addition, our developing understanding of the geology of the Alaska Peninsula required revision of earlier maps, such as the Chignik and Sutwik Island quadrangles map (Detterman and others, 1981) to reflect this new knowledge. We have revised the stratigraphic nomenclature (Detterman and others, 1996) and our assignment of unit names to some rocks has been changed.

All geologic maps on which this compilation is based were published using the Universal Transverse Mercator projection (UTM; Zones 3, 4, and 5). because of the distortions use of the UTM projection would produce on a map of small scale and large area, the plot and graphics files derived from this data are plotted using a more appropriate Albers Equal-area projection for publication.

View the README file as an unformatted, text-only file: README (19 kb)

Please note that the readme file contains important information about the files that make up this report. Size of files given in parentheses behind file names unless otherwise noted.

Arc Export files of the geology for each tier of quadrangles
UTM projection		Geographic coordinates
mkgeol.e00	file size: 7.9 Mb	mkgeolg.e00	file size: 7.9 Mb
uggeol.e00	file size: 4.0 Mb	uggeolg.e00	file size: 3.9 Mb
cggeol.e00	file size: 5.2 Mb	cggeolg.e00	file size: 5.2 Mb
pmgeol.e00	file size: 5.3 Mb	pmgeolg.e00	file size: 5.2 Mb
cbgeol.e00	file size: 3.3 Mb	cbgeolg.e00	file size: 3.3 Mb
Other Export files
krc45.e00		file size: 76 kb
Albers Equal-Area Projection		Geographic Coordinates
mkfld-alb.e00	file size: 9 kb	mkfldg.e00	file size: 10 kb
ugfld-alb.e00	file size: 88 kb	ugfldg.e00	file size: 98 kb
cgfld-alb.e00	file size: 144 kb	cgfldg.e00	file size: 170 kb
pmfld-alb.e00	file size: 42 kb	pmfldg.e00	file size: 51 kb
cbfld-alb.e00	file size: 12 kb	cbfldg.e00	file size: 15 kb
akpencst.e00	file size: 2.5 Mb	akpencstg.e00	file size: 2.6 Mb
EPS files
akpen.eps (14 Mb)		postscript file of geologic map
akpencor.eps (303 kb)		correlation chart
penindex.eps (562 kb)		index map
inseta.eps (345 kb)		inset map of part of the Karluk C-4/5 quadrangle
Hewlett-Packard graphics language file
akpen.jet (6 Mb)
MS Word97/98 file
APMAP.DOC (196 Mb)		MS Word97/98 version of text to accompany map
Adobe Acrobat PDF files of mapsheet and text
aptext.pdf (236 kb)		text
akpen.pdf (3 mb)		map
ARC Graphics files
akpencor.gra (45 kb)		correlation chart
penindex.gra (63 kb)		index map
inseta.gra (55 kb)		inset map of part of the Karluk C-4/5 quadrangle
ARC-related files
akpenofr.aml (8 kb text file)		AML file needed to re-construct map
Ancillary text files
mapcred.pen (3 kb)		credit note for geologic mapping
basecred.pen (1 kb)		note for base map credit
penin1d.key (< 1 kb)		ARC key file used to produce list of map units
penin2d.key (1 kb)		ARC key file used to produce list of map units
penin3d.key (< 1 kb)		ARC key file used to produce list of map units
geoline.key (< 1 kb)		ARC key file used to produce list of line symbols
utm3-alb.prj (< 1 kb)		Project file used to change map projection at plot time
utm4-alb.prj (< 1 kb)		Project file used to change map projection at plot time
utm5-alb.prj (< 1 kb)		Project file used to change map projection at plot time
Lookup tables, symbolsets, and fonts
fnt020 (48 kb)	fnt025 (48 kb)	fnt036 (48 kb)	fnt040 (48 kb)
geoline.lut.e00 (8 kb)	geology.lin.e00 (37 kb)	geology.mrk.e00 (11 kb)	geology.shd.e00 (304 kb)
geology4.lut.e00 (4 kb)	geology5.lut.e00 (4 kb)	geology6.lut.e00 (4 kb)

Download the FGDC-compliant metadata for this report (36Kb) or download a more concise, easier-to-read html version of the metadata

For questions about the scientific content or the digital files of this report, contact Ric Wilson