The files in this directory are an example of a digital geologic map publication that follows the specifications of "NCGMP09--draft standard format for digital publication of geololgic maps, version 1.0, October 2009", which is available at http://ngmdb.usgs.gov/Info/standards/NCGMP09/. With an introductory web page that provided context and the publisher's identifying information, these files could constitute a complete web-based digital publication.
These files are a transcription of "Geologic Map of the Camas Quadrangle, Clark County, Washington, and Multnomah County, Oregon" by Russell C. Evarts and Jim E. O'Connor, published by the USGS as Scientific Investigations Map 3017 in 2008 and available at http://pubs.usgs.gov/sim/3017/. If you need geologic data for the Camas quadrangle, please reference SIM 3017. Do not use this unreviewed transcription.
Files here are

Camas.pdf | 14.5 MB; the published map sheet
Camas-browse.png | 406 KB; reduced-resolution image of the map sheet
Camas-metadata.txt | 63 KB; text version of FGDC-style metadata
Camas-metadata.xml | 56 KM; XML version of FGDC-style metadata
Camas-text.pdf | 1.3 MB; the published map pamphlet
Camas-gdb.zip | 1.6 MB; file geodatabase version of map data; requires ESRI's ArcGIS
Camas-open.zip | 1.4 MB; open file-format version of map data; for translation to other GIS software; lacks of much of the utility of the file geodatabase version
Camas-simple.zip | 1.5 MB; simple shapefile version of map data; for easy display and query (e.g., via a web map service). Only contains some of data