Preliminary Geologic Map of the North-Central Part of the Alamosa 30’ x 60’ 
Quadrangle, Alamosa, Conejos and Costilla Counties, Colorado

By

Michael N. Machette, Ren A. Thompson, and Theodore R. Brandt

2008 

This database, identified as OF 2008-1124, has been approved for release and
publication by the Director of the USGS.  Although this database has been 
subjected to rigorous review and is substantially complete, the USGS reserves 
the right to revise the data pursuant to further analysis and review.  Furthermore, 
it is released on condition that neither the USGS nor the United 
States Government may be held liable for any damages resulting from its 
authorized or unauthorized use.

Although these data have been processed successfully on a computer system at the 
U.S. Geological Survey, no warranty, expressed or implies is made regarding the 
display or utility of the data on any other system, or for general or scientific 
purposes, nor shall the act of distribution constitute such warranty.  The U.S. 
Geological Survey shall not be held liable for improper or incorrect use of the 
data described and/or contained herein.

Any use of trade, product or firm names is for descriptive purposes only and 
does not imply endorsement by the U.S. Geological Survey.

Although this information product, for the most part, is in the public domain, 
it also contains copyrighted material as noted in the text.  Permission to 
reproduce copyrighted items for other than personal use must be secured from the 
copyright owner.

The database can be downloaded via the Web from 
http://pubs.usgs.gov/of/2008/1124/.  ArcInfo export files and ArcView 
shapefiles may be extracted from a gzip-compressed tar file (1124.tar.gz)or zip-
compressed file (1124.zip).  In addition, an Adobe Portable Document Format 
(PDF) file (OF08-1124_map.pdf) can be downloaded, from which paper copies may be 
printed.  

The database contact is:      Theodore R. Brandt 
                              303-236-1901
                              tbrandt@usgs.gov
                              U.S. Geological Survey
                              Box 25046, Mail Stop 980
                              Denver, CO  80225

The data were compiled from field mapping.  Robert M. Kirkham, formerly of the 
Colorado Geological Survey, and Richard F. Madole, emeritus scientist with the 
U.S. Geological Survey, reviewed the geologic map. 

This geospatial database consists of ArcInfo export files (.e00) and ArcView 
shapefiles contained in a gzipped tar archive or zip archive.  Both compressed 
archive files contain both types of geospatial database files.  See the list 
below.  Please refer to the file 1124.met for detailed metadata documentation 
for this geospatial database. 

List of files:
OF08-1124_map.pdf
1124.met
alncbasr.tif
alncbasr.tfw

1124.tar.gz or 1124.zip:
   00README.TXT
   1124.met
   e00 directory:
      alancgeo.e00
      alancage.e00
      wpgcmykg.shd.e00
      geol_sfo.lin.e00
      import.aml
  shapefiles directory:
      alancgeop.shp
      alancgeop.shx
      alancgeop.dbf
      alancgeol.shp
      alancgeol.shx
      alancgeol.dbf
      alancage.shp
      alancage.shx
      alancage.dbf