NOTE: This file is a modified version of the original README file.
The original Open-File Report contains text files, AMLs, SMLs, and symbol
 sets that are not included with the data files received from VCGI. 
The description of these supporting files has been deleted from this modified README file. 
To obtain the original supporting files contact the Vermont Geological Survey,
 Agency of Natural Resources, 103 South Main St., Laundry Bldg., Waterbury, VT 05671.

Modified November 8, 2001

                     U.S. DEPARTMENT OF THE INTERIOR
                         U.S. GEOLOGICAL SURVEY

             Digital and Preliminary Bedrock Geologic Map of the 
                    Pico Peak Quadrangle, Vermont

                                   by

                              G.J. Walsh(1)
                                  and
                             N.M. Ratcliffe(1)

                              Open-File Report 


                        OF-98-XXX-A Map (paper copy)
                      OF-98-XXX-B Database 

                                   1997


                    Prepared in cooperation with the 
                   State of Vermont, Geological Survey


This report is preliminary and has not been reviewed for conformity
with U.S. Geological Survey editorial standards (or with the North
American Stratigraphic Code).  Any use of trade, product, or firm
names is for descriptive purposes only and does not constitute
endorsement by the USGS.  Although this database has been used by
the U.S. Geological Survey, no warranty, expressed or implied, is
made by the USGS as to the accuracy and functioning of the database
and related program material, nor shall the fact of distribution
constitute any such warranty, and no responsibility is assumed by
the USGS in connection therewith.
________________________________
(1) U.S. Geological Survey
Reston, VA 20192



^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
This report (OFR 98-XXX) is available from:

Vermont Agency of Natural Resources
Vermont Geological Survey
103 South Main Street, Laundry Building
Waterbury, VT 05671
Telephone: (802) 241-3608
WWW: http://www.anr.state.vt.us/geology/vgshmpg.htm

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Direct questions or comments on the geology to:
Nicholas Ratcliffe (USGS, Mail Stop 926A, Reston, VA 20192)
or
Gregory Walsh (USGS, Mail Stop 926A, Reston, VA 20192)

Direct questions or comments on the database to:
Gregory Walsh (USGS, Mail Stop 926A, Reston, VA 20192)
e-mail:  gwalsh@usgs.gov
WWW: http://geology.er.usgs.gov/gmapeast/vtp/vermont.html

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Date of latest revision:  May 19, 1998

This database was created in PC ARC/INFO version 3.5 on an
IBM-compatible personal computer.  Digitized by Jonathan Kim (Vermont 
Geological Survey), Greg Walsh, and Vicki Keegan (USGS, Reston).

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Digital data in stateplane coordinate system.  Digital map units in
meters.  National Geodetic Horizontal Datum NAD 1983.

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Source of Geologic Data:
Original data.
Geology mapped by Walsh and Ratcliffe in 1993-1997 at 1:24,000.

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Part B of this Open-File Report contains all of the geologic 
information and topographic information.  

Files are in ArcInfo interchange format and will require using the 
import command in either PCArcInfo or ArcInfo uncompress.  
In ArcView the user must use the Import71 utility to uncompress 
the files to add as themes.

The uncompressed files are listed below:


 COVERAGES  (In ARC/INFO Interchange Format *.e00; use the 
            arc: IMPORT command to restore)
 
 CONTACTS.E00  ... Polygon Coverage for GEOLOGIC MAP UNITS
 
 OUTCROP.E00   ... Polygon Coverage for OUTCROPS 
 
 SCHISTCL.E00  ... Line Coverage for FOLIATION
 
 SCHISTPT.E00  ... Point Coverage for FOLIATION
 
 DUCFLTCL.E00  ... Line Coverage for FAULTS
 
 CRENPT.E00    ... Point Coverage for CLEAVAGE
 
 TOPONORTH.E00 ... Unattributed line coverage for TOPOGRAPHY
                   (North half of quadrangle)

 TOPOSOUTH.E00 ... Unattributed line coverage for TOPOGRAPHY
                   (South half of quadrangle)

 ROADS.E00     ... Line coverage for ROADS (from the Vermont Center
               for Geographic Information, Inc.)

 NEAT.E00      ... Line coverage for neatline boundary

 TOWN.E00      ... Line coverage for town boundaries, contains
               annotation for place names (derived from the 
               Vermont Center for Geographic Information, Inc.) 

 BRITPT.E00    ... Point Coverage for JOINTS & MINOR FAULTS

 MINES.E00     ... Point Coverage for MINES

 
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
The following list gives a brief description of the organization of 
the ARC/INFO coverages:


CONTACTS coverage:
 Item "LITH" in CONTACTS.PAT contains the map unit designators (Y, CZmm, etc.)
 Look-up table CONTACTS.LUT contains the following items:
     
     LITH = map unit designator
     AGE_SORT = a relative number used to sort the map units by age 
     FORMATION = the formation name
     AGE = geologic age of the map unit
     MAP_UNIT = simplified description of rock type(s)
 
FOLIATION, FAULTS, JOINTS, and CLEAVAGE coverages: 
   The FOLIATION (schistosity or gneissosity) layer is comprised of 
   two coverages:
     1) a LINE coverage depicting the foliation form-lines (SCHISTCL)
     2) a POINT coverage containing strike and dip data that is used to draw 
        the symbols on the lines (SCHISTPT)
   
   The foliation form-lines in the SCHISTCL coverage are interpretive.  
   
   The FAULT layer contains a LINE coverage (DUCFLTCL).
     Item "TYPE" in DUCFLTCL.AAT is defined as follows:
       DT = ductile thrust fault
       
 The FOLIATION, CLEAVAGE, and JOINT layers consist of POINT coverages
 (SCHISTPT, CRENPT, and BRITPT).
   
   The *.PAT files for the POINT coverages contain the 
   following items pertaining to the orientation (strike and dip):
   
     DIP = dip value
     AZ  = STRIKE or AZIMUTH value measured from North  
     DIPDIR = direction of dip                                        
                                               0
        North = 0                              |
        East = 90                     270 -----|----- 90
        South = 180                            |
        West = 270                            180
        
     TYPE = refers to type of symbol with the following characters:
               
        I = Inclined 
        V = Vertical
        IC = Inclined cleavage
        VC = Vertical cleavage
        IJ = Inclined joint
        VJ = Vertical joint
 
SYMBOL_ANG  = refers to a standard cartesian angle measured   
     from EAST:                              
                                              90
        North = 90                            |
        East = 0                     180 -----|----- 0
        South = 270                           |
        West = 180                           270
        
        SYMBOL_ANG is used for symbol rotation.
        In Host ARC/INFO calculate pseudo item $angle = symbol_and

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

     

