Online Links:
The geologic unit polygons in the CONTX coverage
was filled with colors from the colornames.shd shadeset in
Arc/Info. A lookup table was created in Arc/Info to fill the
polygons. The lookup table contains the items CODE and SYMBOL.
Here is the content of the lookup table:
Record CODE SYMBOL
1 Dg 110
2 Dkg 113
3 Dp 119
4 Sp 19
5 Spp 60
6 Srb 95
7 Srcs 47
8 Srfg 93
9 Srg 96
10 Srgt 101
11 Srlg 49
12 Srq 84
13 Srr 79
14 Srrt 81
15 Srs 85
The following is a brief description of the ARC/INFO coverages.
GEOLOGIC COVERAGES:
CONTX coverage:
Item CODE in CONTX.PAT contains the map unit designators.
(Srb, Dkg, etc.)
Item LBLTXT in CONTX.PAT is used for selective plotting of code
labels; valid entry is 'n' or item is left blank.
Item TYPE is a general category of rock type:
m=metamorphic and p=plutonic
Item LINTYPE in CONTX.AAT is used for plotting different line types.
Valid entries are "concealed" where contacts are under water,
or item is left blank.
Concealed plotted as dotted line.
Blank plotted as solid line.
Look-up table CONTX.LUT contains the following items:
CODE = map unit designator
AGE_SORT = a relative number used to sort the units by age
FORMATION = the formation name
AGE = geologic age of the map unit
MAP_UNIT = simplified description of rock type(s)
(Complete description is in the accompanying text)
Lithology attribute table CONTX.LITH contains the following items:
CODE = map unit designator
SURF_BED = surficial or bedrock unit
LITHPRI = primary lithology in the map unit
LITHSEC = secondary lithology in the map unit
FORM = formation name
ROCKCLASS = rock type
AGE = geologic age of the map unit
FOSSIL
COLOR
MINPRI = most characteristic minerals
MINSEC = additional common minerals
MINOTH = accessory minerals
CONTUP
CONTLOW
FOLPRI = dominant generation of foliation in the rock
FOLSEC = subordinate generation of foliation in the rock
RMPM = regional prograde-metamorphic minerals
RMRM = regional retrograde-metamorphic minerals
DEFORMAGE = age of deformation
After importing the CONTX.E00 file you will find the look-up table
and the lithology attribute table in the INFO directory. If you are
using ArcView you can add the tables to the project by navigating to
the INFO directory, specifying the INFO file type, and selecting the
desired table. If you are using Arc/Info you can access the data in
the two tables using either the JOINITEM or RELATE operations and the
INFO item CODE.
Structural geology point coverages POINT and STRUX:
Coverage POINT contains all of the structural data points and the
points in the database are located within the polygons in the outcrop
coverage -- the point locations are the original mapped locations.
Coverages STRUX contains structural data used for cartography on
Plate 1. The locations of the points in STRUX have been moved from
the original locations in POINT for plotting purposes only.
Any spatial analysis should use the POINT coverage data.
The STRUX coverage contains annotation for dip and plunge values.
The annotation is not present in the POINT coverage.
The PAT files for the point coverages contain the following
user-defined items:
ITEM NAME
STATION number of field station
POSFMT position format from PLGR+96 GPS unit
ZONE UTM zone from PLGR+96 GPS unit
HDATUM horizontal datum from PLGR+96 GPS unit
HRZERR horizontal error from PLGR+96 GPS unit
ELEV elevation from PLGR+96 GPS unit
VDATUM vertical datum from PLGR+96 GPS unit
ELEVUNIT elevation unit from PLGR+96 GPS unit
Note on HRZERR --
The database includes the horizontal accuracy of point
features as measured and recorded by the PLGR+96 GPS unit.
The stated accuracy of the PLGR+96 is +/- 16 meters.
Note on POSFMT through ELEVUNIT --
These fields are recorded by the PLGR+96 GPS unit. In the
PAT files, some points do not have entries in these fields.
These points have been located without the use of GPS.
The following items are described in more detail below:
TYPE
SUB_TYPE
STRIKE units in degrees
DIP units in degrees
DIPDIR units in degrees
REL_AGE
SYMBOL
SYMBOL_ANG units in degrees
ROTATION
SPACING units in meters
WIDTH units in meters
APERTURE units in meters
MIN1
MIN2
MIN3
CODE relate item for dikes, same as code in CONTX.PAT and LUT
TOPOFEAT
NO_MSMT number of multiple measurements for some brittle features
Here is the detailed explanation of some of the items:
DIP = dip value (planar data) or plunge value (linear data)
STRIKE = measured from north in right-hand rule (planar data)
DIPDIR = Direction of dip (planar data) or trend (linear data)
measured from north
For STRIKE and DIPDIR:
0
North = 0 |
East = 90 270 -----|----- 90
South = 180 |
West = 270 180
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 ARC/INFO calculate pseudo item $angle = symbol_ang
Planar symbols with symbol_ang = 0 look like this:
__________
\/
Linear symbols with symbol_ang = 0 look like this:
----->
SYMBOL refers to a pattern number in GEOLOGY.MRK.
ROTATION refers to the rotation sense of minor folds as viewed
down plunge or offset on minor faults. Valid entries are:
clockwise (right-lateral) = cw
counterclockwise (left-lateral) = cc
REL_AGE refers to the relative age of fabrics.
Valid entries are: n-1, n, n+1, n+2, etc.
TYPE refers to the general type of geologic structure.
Valid entries are: planar, linear, or other
SUB_TYPE refers to the specific geologic structure.
Valid entries used in this report arranged by TYPE:
Record CASE# FREQUENCY TYPE SUB_TYPE
1 1 4 linear elongation
2 2 76 linear fold axis
3 3 14 linear glacial grooves
4 4 6 linear intersection lineation
5 5 5 linear mineral lineation
6 6 1 linear refolded fold axis
7 7 13 linear slickensides
8 8 1 other spring
9 9 79 planar axial surface
10 10 28 planar bedding
11 11 22 planar cleavage
12 12 11 planar deformed schistosity
13 13 76 planar dike
14 14 2 planar fault
15 15 22 planar foliation
16 16 4 planar graded bedding
17 17 17 planar igneous flow foliation
18 18 1579 planar joint
19 19 17 planar joint set
20 20 24 planar joint zone
21 21 76 planar layer parallel schistosity
22 22 3 planar mylonite
23 23 13 planar normal fault
24 24 4 planar overturned bedding
25 25 1 planar refolded axial surface
26 26 1 planar reverse fault
27 27 599 planar schistosity
28 28 24 planar vein
The following are also used in the POINT coverage:
SPACING spacing of joints in joint sets in meters
WIDTH width of joint zone or thickness of dike in meters
APERTURE aperture of joint openings in meters
The following are used in the POINT coverage to describe minerals
on joint surfaces and in veins:
MIN1 primary mineral
MIN2 secondary mineral
MIN3 tertiary mineral
The following values are used in the report, some were modified
after Kretz (1983):
ank ankerite
dol dolomite
hem hematite
lm limonite
ms muscovite
pyl pyrolusite
qtz quartz
sil sillimanite
sul sulfides
tur tourmaline
Kretz, R., 1983, Symbols for rock-forming minerals: American
Mineralogist, v. 68, nos. 1-2, p. 277-279.
TOPOFEAT topographic feature parallel to geologic structure
Values used in this report include:
cliff
stream
joint face
Line coverage FAULT contains the following item:
TYPE = type of fault (normal, reverse, thrust, etc.)
Line coverage LINES contains the following item:
TYPE = type of geologic line (axial traces, folds, isograds, cross-section lines, etc.)
Polygon coverage NEAT represents the neat line boundary of the Hubbard Brook Experimental Forest project area
Polygon coverage OUTCX represents the location of bedrock outcrops within the Hubbard Brook Experimental Forest project area
BASE MAP COVERAGES:
Polygon coverage BOUNDS represents the political boundary of the Hubbard Brook Experimental Forest
Line and polygon coverage HYDRO represents the surface water hydrography within the Hubbard Brook Experimental Forest
Line coverage ROADS contains the following items:
GRANITID = GRANIT-assigned feature number
CLASS = GRANIT-assigned feature number
Line coverage TOPO contains the following items:
ELEV = elevation in feet above mean sea level
CI = contour interval (in feet) used for plotting
SYMBOL = line symbol used for plotting
Point coverage WELLS contains the following items:
ROCKTYPE = Lower Rangeley (lr), Upper Rangeley (ur), and Concord Granite (cg)
SYMB = symbol value used for rplotting
PTYPE = point type (well)
Our mapping study was funded by the USGS Toxic Substances Hydrology Program and was undertaken for the following reasons: 1) to ascertain whether the area might have a greater number of mappable lithologic units than shown on Barton's (1997) map, and to verify the stratigraphically higher formations shown on the map; 2) to have sufficient data to draw geologic cross- sections through the Mirror Lake research site; 3) to gather more data on brittle fracture distribution and orientation; and 4) to assess the degree to which the subsurface lithologies, ductile structures, and fractures observed at the two Mirror Lake well fields correlate with the geology of the surrounding region.
Are there legal restrictions on access or use of the data?Access_Constraints: none
Use_Constraints:Although all data released in this report have been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and related materials and (or) the functioning of the software. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
These data were prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, make any warranty, expressed or implied, or assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product or process disclosed in this report, and represents that its use would not infringe privately owned rights. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of this data or related materials. Reference therein to any specific commercial product, process, or related service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.
| Data format: | Geologic contacts and structural features, base map data, along with symbols and markers for use in Arc/Info in format ARCE (version 7.2.1) Size: 5.2 |
|---|---|
| Network links: |
http://pubs.usgs.gov/of/2000/of00-045/of0045.tar.gz |