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.
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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|