Identification_Information: Citation: Citation_Information: Originator: Karl S. Kellogg Originator: Van S. Williams Publication_Date: 2000 Title: Geologic map of the Ennis 30' X 60' quadrangle, Madison and Gallatin Counties, Montana, and Park County, Wyoming Geospatial_Data_Presentation_Form: Map Series_Information: Series_Name: Geologic Investigations Series Issue_Identification: I-2690 Publication_Information: Publication_Place: Denver, Colorado Publisher: U.S. Geological Survey Online_Linkage: Description: 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. Purpose: Forms part of Montana State Geological Map 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. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2000 Currentness_Reference: publication date Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -112.0 East_Bounding_Coordinate: -111.0 North_Bounding_Coordinate: 45.5 South_Bounding_Coordinate: 45.0 Keywords: Theme: Theme_Keyword_Thesaurus: AGI Glossary Theme_Keyword: Geologic map Theme_Keyword: Stratigraphy Theme_Keyword: Quaternary alluvium Theme_Keyword: Bedrock Theme_Keyword: Structure Theme_Keyword: Laramide Theme_Keyword: Basin-and-Range Theme_Keyword: Archean Theme_Keyword: Absorka Volcanic Supergroup Place: Place_Keyword_Thesaurus: U.S. Board on Geographic Names (BGN) Geographic Names Information System (GNIS) Place_Keyword: Montana Place_Keyword: Madison County Place_Keyword: Gallatin County Place_Keyword: Ennis Place_Keyword: Madison Valley Place_Keyword: Madison Range Place_Keyword: Tobacco Root Mountains Place_Keyword: Gravelly Range Place_Keyword: Gallatin Range Place_Keyword: Ennis Access_Constraints: none Use_Constraints: None Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Karl S. Kellogg Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: Mailing Address: Box 25046, Mail Stop 913, Denver Federal Center City: Denver State_or_Province: CO Postal_Code: 80225 Country: USA Contact_Voice_Telephone: (303) 236-1305 Contact_Facsimile_Telephone: (303) 236-0214 Contact_Electronic_Mail_Address: kkellogg@usgs.gov Browse_Graphic: Browse_Graphic_File_Name: Browse_Graphic_File_Description: 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. Browse_Graphic_File_Type: PDF Data_Set_Credit: This map was compiled in cooperation with the Montana Bureau of Mines and Geology and with the Department of Earth Sciences, Montana State University. Native_Data_Set_Environment: ARC/INFO Version 7.2.1, UNIX Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: 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. Logical_Consistency_Report: 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. Completeness_Report: 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. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: 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. Lineage: Process_Step: Process_Description: 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.). Process_Date: 1995 Process_Step: Process_Description: Map editor reviewed check plots and authors corrected digital files as needed; graphics specialist imported files into graphics program to prepare cartographic product. Process_Date: 1999 Process_Step: Process_Description: Cartographic product printed; digital files for database and PDF files of cartographic product placed on ftp server. Process_Date: 2000 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Vector Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 12 Transverse_Mercator: Scale_Factor_at_Central_Meridian: .9999 Longitude_of_Central_Meridian: -111 Latitude_of_Projection_Origin: 0.0 False_Easting: 0.0 False_Northing: 0.0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 30 Ordinate_Resolution: 30 Planar_Distance_Units: Meters Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1927 Ellipsoid_Name: Clarke 1866 Semi-major_Axis: 6378206.4 Denominator_of_Flattening_Ratio: 294.98 Entity_and_Attribute_Information: Overview_Description: 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 Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: mailing address Address: Central Publications Group Address: MS 902, Box 25046 DFC City: Lakewood State_or_Province: CO Postal_Code: 80225-0046 Country: USA Contact_Voice_Telephone: 303-236-5486 Distribution_Liability: 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. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: ARCE, SHP Format_Version_Number: created with ArcInfo v. 7.1.2 File_Decompression_Technique: .tar.gz - UNIX gzip-compressed TAR file (ARCE files) - use GNU zip and TAR .EXE - self-extracting Windows ZIP archive (SHP files) - execute the file to extract Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: Fees: none Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: mailing address Address: USGS Information Services Address: PO Box 25286 Address: Denver Federal Center City: Denver State_or_Province: CO Postal_Code: 80225 Country: USA Contact_Voice_Telephone: (888) ASK-USGS Resource_Description: I-2690 Distribution_Liability: none Standard_Order_Process: Non-digital_Form: Available as one printed sheet plus pamphlet. Fees: For current prices of USGS information products, please see http://mapping.usgs.gov/esic/prices/. Metadata_Reference_Information: Metadata_Date: 20001019 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Karl S. Kellog Contact_Organization: U.S. Geological Survey, Geologic Division, Central Earth Surface Processes Team Contact_Address: Address_Type: mailing address Address: U.S. Geological Survey Address: MS 913, Box 25046, Denver Federal Center City: Denver State_or_Province: CO Postal_Code: 80225-0046 Country: USA Contact_Voice_Telephone: (303) 236-1305 (office) Contact_Electronic_Mail_Address: kkellogg@usgs.gov Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998