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The file '/pub/open-file-reports/ofr-93-0299/ofr_93_299.tar'
contains all necessary files for Open-File Report 93-0299.

6/29/93
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PRELIMINARY PAHUTE MESA 30' X 60' GEOLOGIC DATABASE
ON-LINE USER INSTRUCTIONS
6/25/93

The accompanying Pahute Mesa 30' x 60' geologic database files are in both GRASS ascii vector and DLG-3 (optional) formats.  The data are in a GRASS data-directory structure called PAHUTE.  The DLG-3 data files are located in the subdirectory PAHUTE/pahute/dlg.  (The current release and documentation of GRASS are available on Internet from moon.cecer.army.mil [129.229.20.254] under the directory /grass/grass4.1).  Introductory and explanatory text that accompanies the concurrently released USGS Open-File geologic map of the Pahute Mesa sheet (OFR-93-299) is included with the database files in both ascii (pmof_txt.asc) and Postscript (pmof_txt.pst) formats.  This text should be referred to for geologic and compilation information relevant to the database.

Attribute code definition tables for tagged map elements in the polygon (pm_100.poly), fault (pm_100.flts), fold (pm_100.folds), and caldera (pm_100.calds) data layers are located in files of the same names in the subdirectories PAHUTE/pahute/dig_cats and PAHUTE/pahute/cats.  Further translations of the codes for linear map elements are as follows:

pm_100.flts:  

und=displacement unspecified  
Wbb=down-to-left (w.r.t. origin of fault line) apparent displacement  
Ebb=down-to-right apparent displacement  
Wst=thrust fault; upper plate on left side  
Est=thrust fault; upper plate on right side  
Whr=landslide slip surface; slide block on left side  
Ehr=landslide slip surface; slide block on right side  
Wbx=low-angle (< 30 deg. dip) fault; upper plate on left side  
Ebx=low-angle fault; upper plate on right side  

pm_100.folds:  

NS--=syncline axis  
NA--=anticline axis  
OS--=overturned syncline  
OA--=overturned anticline  
O--L=overturned fold limbs inclined to left  
O--R=overturned fold limbs inclined to right  
--U-=plunging towards axis origin  
--D-=plunging away from axis origin  
NM-L=monocline; down to left  
NM-R=monocline; down to right  

pm_100.calds:  

und=caldera structural margin  
hrl=caldera topographic wall; basin to left  
hrr=caldera topographic wall; basin to right  

Certainties of these coded linear elements (i.e., solid vs. dotted) are specified in respective files located in the subdirectory PAHUTE\pahute\colr.

Structural attitude data are listed in tabular form in the file pm_100.sdp located in the subdirectory PAHUTE/pahute/site_lists.  Each entry has the form: <x coord.> <y coord.> <strike azimuth (measured CCW w.r.t. east)> <dip> <attitude identifier>.  Attitude identifiers are defined as follows:

BED=inclined bedding
BDV=vertical bedding
BDH=horizontal bedding
OTB=overturned bedding
FOL=inclined foliation
FLV=vertical foliation
FLH=horizontal foliation
FLT=fault plane

Geologic inquires should be directed to Scott Minor.  Technical inquiries can be addressed to Scott Minor or Ron Wahl.

Scott Minor / Ron Wahl
U.S. Geological Survey
P.O. Box 25046, MS 913
Denver, CO  80225

E mail:  sminor@usgs.gov
	  rwahl@usgs.gov

(303)236-0303 (Minor)  (303)236-1320 (Wahl)
FAX (303)236-0214