Geologic map of the Ennis 30' X 60' quadrangle, Madison and Gallatin Counties, Montana, and Park County, Wyoming

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Frequently anticipated questions:

What does this data set describe?

Title:
Geologic map of the Ennis 30' X 60' quadrangle, Madison and Gallatin Counties, Montana, and Park County, Wyoming
Abstract:
The Ennis 1:100,000 quadrangle lies within both the Laramide (Late Cretaceous to early Tertiary) foreland province of southwestern Montana and the northeastern margin of the middle to late Tertiary Basin and Range province.
The oldest rocks in the quadrangle are Archean high-grade gneiss, and granitic to ultramafic intrusive rocks that are as old as about 3.0 Ga. The gneiss includes a supracrustal assemblage of quartz-feldspar gneiss, amphibolite, quartzite, and biotite schist and gneiss. The basement rocks are overlain by a platform sequence of sedimentary rocks as old as Cambrian Flathead Quartzite and as young as Upper Cretaceous Livingston Group sandstones, shales, and volcanic rocks.
The Archean crystalline rocks crop out in the cores of large basement uplifts, most notably the "Madison-Gravelly arch" that includes parts of the present Tobacco Root Mountains and the Gravelly, Madison, and Gallatin Ranges. These basement uplifts or blocks were thrust westward during the Laramide orogeny over rocks as young as Upper Cretaceous. The thrusts are now exposed in the quadrangle along the western flanks of the Gravelly and Madison Ranges (the Greenhorn thrust and the Hilgard fault system, respectively). Simultaneous with the west-directed thrusting, northwest-striking, northeast-side-up reverse faults formed a parallel set across southwestern Montana; the largest of these is the Spanish Peaks fault, which cuts prominently across the Ennis quadrangle.
Beginning in late Eocene time, extensive volcanism of the Absorka Volcanic Supergroup covered large parts of the area; large remnants of the volcanic field remain in the eastern part of the quadrangle. The volcanism was concurrent with, and followed by, middle Tertiary extension. During this time, the axial zone of the "Madison-Gravelly arch," a large Laramide uplift, collapsed, forming the Madison Valley, structurally a complex down-to-the-east half graben. Basin deposits as thick as 4,500 m filled the graben.
Pleistocene glaciers sculpted the high peaks of the mountain ranges and formed the present rugged topography.
Supplemental_Information:
Compilation scale is 1:100,000. Geology mapped between 1988 and 1995. Compilation completed 1997. Review and revision completed 1997. Archive files prepared 199802.
  1. How might this data set be cited?
    Kellogg, Karl S., and Williams, Van S., 2000, Geologic map of the Ennis 30' X 60' quadrangle, Madison and Gallatin Counties, Montana, and Park County, Wyoming: U.S. Geological Survey Geologic Investigations Series I-2690, U.S. Geological Survey, Denver, Colorado.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -112.0
    East_Bounding_Coordinate: -111.0
    North_Bounding_Coordinate: 45.5
    South_Bounding_Coordinate: 45.0
  3. What does it look like?
    http://pubs.usgs.gov/imap/i-2690/i-2690so.pdf (PDF)
    Complete layout, including a list of map units and symbols and supplemental illustrations. An accompanying pamphlet contains a full description of the map units and references cited.
    http://pubs.usgs.gov/imap/i-2690/i-2690.gif (GIF)
    Reduced image depicting entire map sheet, 432x348 pixels, 24-bit color.
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 2000
    Currentness_Reference:
    publication date
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: Map
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Vector data set.
    2. What coordinate system is used to represent geographic features?
      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 12
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -111
      Latitude_of_Projection_Origin: 0.0
      False_Easting: 500000
      False_Northing: 0.0
      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 30
      Ordinates (y-coordinates) are specified to the nearest 30
      Planar coordinates are specified in Meters
      The horizontal datum used is North American Datum of 1927.
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.4.
      The flattening of the ellipsoid used is 1/294.98.
  7. How does the data set describe geographic features?
    Entity_and_Attribute_Overview: 
    The dataset may be downloaded in either ARC/INFO export format (.e00 files) or
ARCView shapefile format.  A printable PDF version of the map is also available.
The dataset consists of four coverages (ENNISGEO, ENNISFLT, ENNISSYM, and
ENNISATT) and a  .tiff file containing the scanned USGS topographic basemap.  The
coverages containing both arc and polygon or point entities, ENNISGEO/ENNISATT,
have been divided into two separate sets of files in the ARCView shapefile
format named ENNISGLN/ENNISALN and ENNISGPT/ENNISAPT for the line and point
entities respectively.  All coverages contain the standard ARC/INFO items in
addition to the items defined in more detail below.

--------------------------------------------------------------------------------

ENNISGEO: Polygon coverage containing all contacts and known or approximated
fault lines along with unit label points.

PAT Item Definitions:
UNIT_SYM is a character item defining the geologic unit represented by each
polygon using the unit abreviations defined in the accompanying pamphlet
(Proterozoic = !, Cambrian = _, Pennsylvanian = &, and Triassic = @)
SHADE_SYM is an integer item defining the cartographic color of each polygon
from the shadeset ctr269.shd

**************************ennisgeo.pat******************************************

COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME     INDEXED?
    1  AREA                   8    18     F      5                        -
    9  PERIMETER              8    18     F      5                        -
   17  ENNISGEO#              4     5     B      -                        -
   21  ENNISGEO-ID            4     5     B      -                        -
   25  SHADE_SYM              3     3     I      -                        -
   28  UNIT_SYM               8     8     C      -                        -

Record  CASE# FREQUENCY UNIT_SYM SHADE_SYM
     1      1     2                0
     2      2     2     !Abg     109
     3      3     8     !Abs      71
     4      4     2     !Agg     107
     5      5     7     !Aif     118
     6      6     1     !Amd      88
     7      7     5     !Ams      72
     8      8    30     !Aph      69
     9      9    14     !Ass     155
    10     10     6     !di       99
    11     11   108     &Mqa     246
    12     12    25     Aag      127
    13     13   182     Aam      155
    14     14    26     Abh       97
    15     15     4     Abm      132
    16     16     5     Abs      159
    17     17     7     Agd      201
    18     18    14     Agg       65
    19     19    16     Agn      102
    20     20    11     Agp       85
    21     21     6     Ags      114
    22     22     1     Aif       99
    23     23    24     Ama       84
    24     24    34     Amb       88
    25     25    27     Aq       172
    26     26   246     Aqf       91
    27     27    15     At        67
    28     28    26     Aum      140
    29     29    29     J@ed     125
    30     30    72     J@u      234
    31     31    39     Jm       235
    32     32     5     Kb        50
    33     33    65     Kc       124
    34     34    68     Kd        77
    35     35    38     Kev      120
    36     36    92     Kf       144
    37     37    13     Kgd       75
    38     38   122     Kk       208
    39     39     7     Kl        79
    40     40    11     Kll       82
    41     41     4     Klm       81
    42     42     9     Klu       80
    43     43    71     Kmo      145
    44     44   114     Kmt      164
    45     45     1     Ks        49
    46     46    32     Ktc      122
    47     47    10     Ku       242
    48     48    88     MDtj     250
    49     49     5     Mbs      247
    50     50    41     Ml       252
    51     51    58     Mm       248
    52     52    38     Mmc      240
    53     53    16     O_rm     257
    54     54     7     PMu      244
    55     55    94     Ps       245
    56     56    25     QTbf      62
    57     57    92     Qal        1
    58     58    44     Qcl        2
    59     59     3     Qd        16
    60     60    15     Qf         4
    61     61     5     Qfc       10
    62     62    54     Qg       218
    63     63    15     Qgc        3
    64     64   236     Ql        11
    65     65    69     Qr         7
    66     66     1     Qs        11
    67     67   142     Qt         9
    68     68   103     Qti       37
    69     69     4     TKf       30
    70     70    11     TKg       45
    71     71     5     Tai       22
    72     72    10     Tam       21
    73     73    39     Tas       20
    74     74     2     Tc        25
    75     75    10     Tg        48
    76     76    78     Tht       18
    77     77    12     Ti        34
    78     78    10     Tl        14
    79     79     2     Tls       64
    80     80    17     Ts        12
    81     81    13     Tv        24
    82     82     1     Tvd       23
    83     83     4     Tvr        6
    84     84     6     Tvt       41
    85     85    18     Tvv       24
    86     86    87     _m       228
    87     87    18     _mi      263
    88     88    15     _rp      115
    89     89    14     _u       262
    90     90    78     _wf      266
    91     91    94     water    216

********************************************************************************

AAT Item Definitions:
LINE_TYPE is a character item defining the geologic line type
LINE_CODE is an integer item defining a numerical code which directly correlates
to LINE_TYPE
LINE_SYM is an integer item defining the cartographic line style from the lineset
alcwrg.lin

**************************ennisgeo.aat******************************************

COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME     INDEXED?
    1  FNODE#                 4     5     B      -                        -
    5  TNODE#                 4     5     B      -                        -
    9  LPOLY#                 4     5     B      -                        -
   13  RPOLY#                 4     5     B      -                        -
   17  LENGTH                 8    18     F      5                        -
   25  ENNISGEO#              4     5     B      -                        -
   29  ENNISGEO-ID            4     5     B      -                        -
   33  LINE_TYPE             25    25     C      -                        -
   58  LINE_CODE              3     3     I      -                        -
   61  LINE_SYM               3     3     I      -                        -

Record  CASE# FREQUENCY LINE_CODE LINE_TYPE                 LINE_SYM
     1      1  6917       1       certain contact            25
     2      2   320       2       approximate contact        26
     3      3   326       4       certain fault               1
     4      4     1       5       approximate fault           3
     5      5   873       7       certain normal fault        1
     6      6    12       8       approximate normal fault    3
     7      7   170      10       certain reverse fault       1
     8      8     4      11       approximate reverse fault   3
     9      9   621      13       certain thrust fault        1
    10     10     3      14       approximate thrust fault    3
    11     11     6      16       detachment fault            3
    12     12   219      30       dacite sill (Kd)            1
    13     13    82      40       diabase dike (!di)          1
    14     14     1      60       marble (Ama)                1
    15     15   218      90       water contact              25
    16     16   337      99       map boundary                1

********************************************************************************

--------------------------------------------------------------------------------

ENNISFLT: Arc coverage containing all structure lines including faults and folds.

AAT Item Definitions:
LINE_TYPE is a character item defining the geologic line type
LINE_CODE is an integer item defining a numerical code which directly correlates
to LINE_TYPE
LINE_SYM is an integer item defining the cartographic line style from the lineset
alcwrg.lin

**************************ennisflt.aat******************************************

COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME     INDEXED?
    1  FNODE#                 4     5     B      -                        -
    5  TNODE#                 4     5     B      -                        -
    9  LPOLY#                 4     5     B      -                        -
   13  RPOLY#                 4     5     B      -                        -
   17  LENGTH                 8    18     F      5                        -
   25  ENNISFLT#              4     5     B      -                        -
   29  ENNISFLT-ID            4     5     B      -                        -
   33  LINE_TYPE             25    25     C      -                        -
   58  LINE_CODE              3     3     I      -                        -
   61  LINE_SYM               3     3     I      -                        -

Record  CASE# FREQUENCY LINE_CODE LINE_TYPE                 LINE_SYM
     1      1    60       3       concealed contact          43
     2      2   326       4       certain fault               1
     3      3     1       5       approximate fault           3
     4      4     6       6       concealed fault            44
     5      5   873       7       certain normal fault        1
     6      6    12       8       approximate normal fault    3
     7      7    45       9       concealed normal fault     44
     8      8   170      10       certain reverse fault       1
     9      9     4      11       approximate reverse fault   3
    10     10    35      12       concealed reverse fault    44
    11     11   619      13       certain thrust fault        1
    12     12     3      14       approximate thrust fault    3
    13     13    60      15       concealed thrust fault     44
    14     14     6      16       detachment fault            3
    15     15   227      20       certain fold axis          25
    16     16    21      22       concealed fold axis        43
    17     17    34      60       marble (Ama)                1
    18     18   172      98       7.5 min tic marks          25

********************************************************************************

--------------------------------------------------------------------------------

ENNISSYM: Arc coverage containing cartographic structural line decorations
(sawteeth, bar-and-ball symbols, fold arrows).

AAT Item Definitions:
LINE_SYM is an integer item defining the cartographic line style from the lineset
alcwrg.lin

**************************ennissym.aat******************************************

COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME     INDEXED?
    1  FNODE#                 4     5     B      -                        -
    5  TNODE#                 4     5     B      -                        -
    9  LPOLY#                 4     5     B      -                        -
   13  RPOLY#                 4     5     B      -                        -
   17  LENGTH                 8    18     F      5                        -
   25  ENNISSYM#              4     5     B      -                        -
   29  ENNISSYM-ID            4     5     B      -                        -
   33  LINE_SYM               3     3     I      -                        -

Record  CASE# FREQUENCY LINE_SYM
     1      1  4528      25

********************************************************************************

--------------------------------------------------------------------------------

ENNISATT: Arc and point coverage containing bedding and foliation attitude
information in the form of cartographic strike and dip symbols (arcs) and dip
values (points).

PAT Item Definitions:
DIP is a character item defining the dip angle in degrees (ranging from 0-90)

**************************ennisatt.pat******************************************

COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME     INDEXED?
    1  AREA                   8    18     F      5                        -
    9  PERIMETER              8    18     F      5                        -
   17  ENNISATT#              4     5     B      -                        -
   21  ENNISATT-ID            4     5     B      -                        -
   25  DIP                    8     8     C      -                        -

 Values for DIP range from 2 to 89

********************************************************************************

AAT Item Definitions:
LINE_SYM is an integer item defining the cartographic line style from the lineset
alcwrg.lin

**************************ennisatt.aat******************************************

COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME     INDEXED?
    1  FNODE#                 4     5     B      -                        -
    5  TNODE#                 4     5     B      -                        -
    9  LPOLY#                 4     5     B      -                        -
   13  RPOLY#                 4     5     B      -                        -
   17  LENGTH                 8    18     F      5                        -
   25  ENNISATT#              4     5     B      -                        -
   29  ENNISATT-ID            4     5     B      -                        -
   33  LINE_SYM               3     3     I      -                        -

Record  CASE# FREQUENCY LINE_SYM
     1      1  6963       1

********************************************************************************
--------------------------------------------------------------------------------
    Entity_and_Attribute_Detail_Citation: None

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Karl S. Kellogg
    • Van S. Williams
  2. Who also contributed to the data set?
    This map was compiled in cooperation with the Montana Bureau of Mines and Geology and with the Department of Earth Sciences, Montana State University.
  3. To whom should users address questions about the data?
    Karl S. Kellogg
    U.S. Geological Survey
    Box 25046, Mail Stop 913, Denver Federal Center
    Denver, CO
    USA

    (303) 236-1305 (voice)
    (303) 236-0214 (FAX)
    kkellogg@usgs.gov

Why was the data set created?

This map forms part of the Montana State Geological Map.

How was the data set created?

  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
    Date: 1995 (process 1 of 4)
    The scanned lines were edited in DESIGN-CAD and brought into ARC/ INFO with the DXFARC command. Two coverages were initially created, one containing polygons, the other containing all other features (labels, fold axes, decorations, etc.).
    Date: 1999 (process 2 of 4)
    Map editor reviewed check plots and authors corrected digital files as needed; graphics specialist imported files into graphics program to prepare cartographic product.
    Date: 2000 (process 3 of 4)
    Cartographic product printed; digital files for database and PDF files of cartographic product placed on ftp server.
    Date: 19-Aug-2009 (process 4 of 4)
    Creation of original metadata record Person who carried out this activity:
    Karl S. Kellog
    U.S. Geological Survey, Geologic Division, Central Earth Surface Processes Team
    U.S. Geological Survey
    Denver, CO
    USA

    (303) 236-1305 (voice)
    kkellogg@usgs.gov
  3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
    Data were entered and checked by the geologist who made the observations. The attributes of this geospatial data set consist of text identifiers and numeric codes that indicate the identity of the geologic unit or type of geologic feature, and determine how each feature is colored or symbolized. To check attribute accuracy, a color check plot was visually compared to the geologist's original compilation. Discrepancies between the digital geospatial dataset and the original analog compilation were corrected as needed. Machine-created listings of unique attribute values were used to identify spelling errors or other inconsistencies, and corrections were made as needed. This map was been thoroughly reviewed for conformity with U.S. Geological Survey editorial standards and stratigraphic nomenclature.
  2. How accurate are the geographic locations?
    Lines were primarily positioned by interpretation of published preexisting geological mapping, thesis maps, and unpublished geological mapping. Lines were scanned from the basemap. The scanned lines were vectorized with the CADCORE program. Additional lines and point observations were added using a digitizer tablet with resolution of 0.001 inch. Most positions on the map are estimated to be accurate closer than 30 m horizontally.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    Data are complete; no features were eliminated or generalized. There is no cross section and the ARC/INFO database lacks a unit properties table, although unit properties are described in the text explanation. A scanned base map is included.
  5. How consistent are the relationships among the observations, including topology?
    Map elements were visually checked by the author for overshoots, undershoots, duplicate features, polygon attributes, and other errors. Automated (ARC/INFO) routines were also used to check the databases for polygon label errors, line or point attribution errors, sliver polygons, dangling arcs, intersection errors, and projection information. The map was reviewed by one other geologist for consistency with basic geologic principles and general conformity to USGS mapping standards.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints: none
Use_Constraints: None
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey
    Central Publications Group
    Lakewood, CO
    USA

    303-236-5486 (voice)
  2. What's the catalog number I need to order this data set?
  3. What legal disclaimers am I supposed to read?
    Although these digital spatial data have been subjected to rigorous review and are substantially complete, they are released on the condition that neither the USGS nor the United States Government may be held liable for any damages resulting from their authorized or unauthorized use.
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 13-Jun-2016
Metadata author:
Peter N Schweitzer
USGS Midwest Area
Collection manager, USGS Geoscience Data Clearinghouse, http://geo-nsdi.er.usgs.gov/
Mail Stop 954
12201 Sunrise Valley Dr
Reston, VA
USA

703-648-6533 (voice)
703-648-6252 (FAX)
pschweitzer@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://geo-nsdi.er.usgs.gov/metadata/map-i/2690/metadata.faq.html>
Generated by mp version 2.9.48 on Tue Jul 03 20:04:53 2018