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The Digital Geologic Map of Colorado in ARC/INFO Format

Metadata also available as - [Outline] - [Parseable text] - [XML]

Frequently anticipated questions:


What does this data set describe?

Title: The Digital Geologic Map of Colorado in ARC/INFO Format
Abstract:
This geologic map was prepared as a part of a study of digital methods and techniques as applied to complex geologic maps. The geologic map was digitized from the original scribe sheets used to prepare the published Geologic Map of Colorado (Tweto 1979). Consequently the digital version is at 1:500,000 scale using the Lambert Conformal Conic map projection parameters of the state base map. Stable base contact prints of the scribe sheets were scanned on a Tektronix 4991 digital scanner. The scanner automatically converts the scanned image to an ASCII vector format. These vectors were transferred to a VAX minicomputer, where they were then loaded into ARC/INFO. Each vector and polygon was given attributes derived from the original 1979 geologic map.
Supplemental_Information:
This data base consists of three major Arc/Info GIS datasets: - one the geologic map with faults, formations and volcanic vents, - two the index and correlation chart and - three the sources of geologic data.
April 1995, An update was done solely for the purpose of adding the abilitly to plot to an HP650c plotter. Two new ARC/INFO plot AMLs along with a lineset and shadeset for the HP650C design jet printer have been included. These new files are COLORADO.650, INDEX.650, TWETOLIN.E00 and TWETOSHD.E00. These files were created on a UNIX platform with ARC/INFO 6.1.2. Updated versions of INDEX.E00, CONTACT.E00, LINE.E00, DECO.E00 and BORDER.E00 files that included the newly defined HP650c items are also included.
  1. How should this data set be cited?

    Green, Gregory N., 1992, The Digital Geologic Map of Colorado in ARC/INFO Format: U.S. Geological Survey Open-File Report 92-507, U.S. Geological Survey, Denver.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -109.1
    East_Bounding_Coordinate: -102.0
    North_Bounding_Coordinate: 41.0
    South_Bounding_Coordinate: 37.0

  3. What does it look like?

  4. Does the data set describe conditions during a particular time period?

    Calendar_Date: 1992
    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?

      The map projection used is Lambert Conformal Conic.

      Projection parameters:
      Standard_Parallel: 33
      Standard_Parallel: 45
      Longitude_of_Central_Meridian: -105.5
      Latitude_of_Projection_Origin: 0
      False_Easting: 0.00000
      False_Northing: 0.00000

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 1.0
      Ordinates (y-coordinates) are specified to the nearest 1.0
      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:
    CODING SCHEME FOR ATTRIBUTES:
    
    NAME:           FEATURE:
    P1,P2           Shorthand attributes
    BW              Line pattern from CARTO.LIN
    CCA             Line pattern or shade color from CCA.LIN or CCA.SHD
    CCB             Shade color from CCB.SHD
    PATT            Shade pattern from DOT.SHD
    HP              Line pattern or shade color from TWETO.LIN or TWETO.SHD
    
    CONTACT.AAT
    NAME                 P1  P2  BW  CCA  HP  MAJOR1 MINOR1 MAJOR2 MINOR2
    
    CONTACT              1   -    0    1  101  500    201     -      -
    WATER, SHORELINE     2   -    0    1  101   40    200     -      -
    STATE OUTLINE        3   -  127    0  139   91      8     -      -
    FAULT                -   1    0    4  102   -      -     501    203
    FAULT, THRUST        -   2    0    4  102   -      -     501    204
    FAULT, DOTTED        -   3  106    0  110   -      -     501    205
    FAULT, DASHED        -   4  114    0  114   -      -     501    206
    BAR                  -   5    0    0  101   -      -     501    218
    DIATREME             -   8    0    0  101   -      -     501    215
    VOL. CONE            -   9    0  212  201   -      -     501    216
    PC SHEAR ZONE        -  22    0    0  101   -      -     501    213
    SINGLE LINE OUTCROP  -  24    0    0    0   -      -     501    226
    NON-PRINTING CONTACT -  25    0    0    0  500    202     -      -
    Some vectors can have both a P1 and P2 code.  Such as a fault that
    is also a contact.
    
    
    DECO.AAT
    NAME                P1   BW  CCA  HP  MAJOR1 MINOR1
    
    BALL                 6    0    1  101  501    219
    TEETH                7    0    1  101  501    220
    DIATREME             8    0    2  101  501    215
    VOL. NECK           10    0  212  201  501    217
    MONOCLINE           11    0  212  201  501    207
    MONOCLINE, DOTTED   12    0  353  209  501    208
    SYNCLINE            13    0  212  201  501    209
    SYNCLINE, DOTTED    14    0  353  209  501    210
    ANTICLINE           15    0  212  201  501    211
    ANTICLINE, DOTTED   16    0  353  209  501    212
    MONOCLINE ARROW     17    0  212  201  501    221
    SYNCLINE ARROW      18    0  212  201  501    222
    ANTICLINE ARROW     19    0  212  201  501    223
    FOLD ARROWHEAD      20    0  212  201  501    224
    OVERTURNED SYMBOL   21    0  212  201  501    225
    PC SHEAR ZONE       22    0    1  101  501    213
    JURASSIC LIMIT      23  118    0  113  501    214
    
    
    LINE.AAT
    NAME                P1       BW  CCA  HP   MAJOR1 MINOR1
    
    Tbbi,               49        0  384  501  510     49
    Tbr,                50        0  386  502  510     50
    Tui,                58        0  512  503  510     58
    Tmi,                59        0  505  508  510     59
    TKi,                66        0  441  504  510     66
    Kmj,                99        0  335  507  510     99
    _am,               172        0  331  505  510    172
    Yam,               181        0  449  506  510    181
    Tmi,inferred       185        0  500  509  510    185
    
    
    CONTACT.PAT
    NAME                P1  CCA   HP  CCB PATT   MAJOR1 MINOR1
    
    Qa,                  1    16    1  0   0    520      1
    Qg,                  2    24    2  0   0    520      2
    Qgo,                 3    31    3  0   0    520      3
    Qe,                  4    19    4  0   0    520      4
    Qeo,                 5    19    5  0  55    520      5
    Qd,                  6    25    6  0   0    520      6
    Qdo,                 7    25    7  0  55    520      7
    Ql,                  8    25    8  0  71    520      8
    Qb,                  9    61    9  0   0    520      9
    QTsa,               10    19   10  0  71    520     10
    QTa,                11    31   11  0  55    520     11
    To,                 12    50   12  0   0    520     12
    Tgv,                13    50   13  0  71    520     13
    Ta,                 14    50   14  0  55    520     14
    Twr,                15    64   15  0   0    520     15
    Th,                 16    75   16  0  71    520     16
    Tcu,                17    47   17  0   0    520     17
    Tpc,                18   303   18  0   0    520     18
    Tdu,                19   303   19  0   0    520     19
    Tbp,                20    50   20  0   0    520     20
    Tt,                 21    50   21  0   0    520     21
    Tnp,                22    50   22  0   0    520     22
    Tos,                23    64   23  0   0    520     23
    Tu,                 25    75   25  0  71    520     25
    Tb,                 26    75   26  0  71    520     26
    Tg,                 27    81   27  0   7    520     27
    Tgp,                28   103   28  0   0    520     28
    Tgl,                29    81   29  0   0    520     29
    Tglm,               30   103   30  0   0    520     30
    Tgt,                31    88   31  0 103    520     31
    Tglu,               32    81   32  0   0    520     32
    Tglw,               33    81   33  0  71    520     33
    Tw,                 34    47   34  0   0    520     34
    Twc,                35    45   35  0   0    520     35
    Twn,                36    46   36  0   0    520     36
    Two,                37    47   37  0  71    520     37
    Tf,                 38   303   38  0   0    520     38
    Tc,                 39   303   39  0   0    520     39
    Tm,                 40   303   40  0   0    520     40
    Td,                 41    50   41  0   0    520     41
    Ts,                 42    50   42  0   0    520     42
    Tsp,                43   303   43  0   0    520     43
    Tlp,                44    50   44  0   0    520     44
    Tsj,                45    47   45  0   0    520     45
    Te,                 46    47   46  0   0    520     46
    Tn,                 47   303   47  0   0    520     47
    Tbb,                48   118   48  0   7    520     48
    Tbbi,               49   152   49  0   0    520     49
    Tbr,                50   186   50  0   0    520     50
    Tbrt,               51    96   51  0   0    520     51
    Taf,                52   152   52  0   0    520     52
    Tial,               53    64   53  0   0    520     53
    Tiql,               54    64   54  0 127    520     54
    Tpl,                55   348   55  0   0    520     55
    Twm,                56   155   56  0   0    520     56
    Tv,                 57    79   57  0   0    520     57
    Tui,                58   358   58  0   0    520     58
    Tmi,                59   124   59  0   0    520     59
    TKda,               60    35   60  0   0    520     60
    Tdv,                61    35   61  0  71    520     61
    TKdl,               62    35   62  0   0    520     62
    TKr,                63    35   63  0   0    520     63
    TKa,                64    35   64  0   0    520     64
    TKec,               65    32   65  0 103    520     65
    TKi,                66   387   66  0   0    520     66
    Kl,                 67   723   67  0   0    520     67
    Kf,                 68   718   68  0   0    520     68
    Klf,                69   718   69  0   7    520     69
    Kvt,                70   723   70  0   7    520     70
    Kp,                 71   716   71  0   0    520     71
    Kpu,                72   712   72  0   0    520     72
    Kpm,                73   767   73  0   0    520     73
    Kpl,                74   720   74  0   0    520     74
    Kn,                 75   761   75  0   0    520     75
    Kcg,                76   736   76  0   0    520     76
    Kc,                 77   761   77  0   0    520     77
    Kpg,                78   709   78  0  71    520     78
    Kdp,                79   785   79  0   0    520     79
    Kd,                 80   785   80  0   0    520     80
    Kmw,                81   723   81  0   0    520     81
    Kls,                82   712   82  0   0    520     82
    Kmv,                83   717   83  0   0    520     83
    Kmvu,               84   737   84  0   0    520     84
    Kmvl,               85   751   85  0  95    520     85
    Kw,                 86   767   86  0   0    520     86
    Ki,                 87   751   87  0  95    520     87
    Kh,                 88   737   88  0   0    520     88
    Ksc,                89   767   89  0  55    520     89
    Kmgs,               90   751   90  0  95    520     90
    Km,                 91   736   91  0   0    520     91
    Kmfm,               92   709   92  0 103    520     92
    Kfd,                93   785   93  0  95    520     93
    Kdb,                94   785   94  0   0    520     94
    Kkf,                95   723   95  0   0    520     95
    Kpcl,               96   767   96  0   0    520     96
    Kch,                97   720   97  0   0    520     97
    Kmp,                98   761   98  0   0    520     98
    Kmj,                99   736   99  0  71    520     99
    KJdm,              100   755  100  0 103    520    100
    KJdj,              101   755  101  0 103    520    101
    KJdw,              102   755  102  0 103    520    102
    KJdr,              103   755  103  0 103    520    103
    KJde,              104   755  104  0 103    520    104
    KJds,              105   755  105  0 103    520    105
    Jm,                106   746  106  0   0    520    106
    Jmj,               107   746  107  0   0    520    107
    Jmc,               108   746  108  0   0    520    108
    Jmw,               109   746  109  0   0    520    109
    Jmr,               110   746  110  0   0    520    110
    Jme,               111   746  111  0   0    520    111
    Jms,               112   746  112  0   0    520    112
    Jmse,              113   746  113  0   0    520    113
    Jmce,              114   746  114  0   0    520    114
    Jmre,              115   746  115  0   0    520    115
    Jmwe,              116   746  116  0   0    520    116
    J@g,               117   782  117  0   0    520    117
    J@gc,              118   782  118  0  71    520    118
    J@mg,              119   782  119  0  95    520    119
    J@mc,              120   800  120  0   0    520    120
    @kc,               121   790  121  0   0    520    121
    @wc,               122   790  122  0   0    520    122
    @m,                123   741  123  0   0    520    123
    @ch,               124   741  124  0   0    520    124
    @cc,               125   776  125  0 103    520    125
    @c,                126   776  126  0   0    520    126
    @d,                127   776  127  0   0    520    127
    @dg,               128   776  128  0   0    520    128
    @Pl,               129   788  129  0 103    520    129
    @Ps,               130   788  130  0   0    520    130
    @Pll,              131   788  131  0   0    520    131
    @Pjs,              132   788  132  0  95    520    132
    @Pcs,              133   788  133  0  95    520    133
    @Pcp,              134   788  134  0  95    520    134
    @Pr,               135   788  135  0  71    520    135
    @Pdc,              136   788  136  0  71    520    136
    @Pmc,              137   788  137  0   0    520    137
    @&lf,              138   805  138  0   0    520    138
    Pp,                139   682  139  0   0    520    139
    Pu,                140   682  140  0   0    520    140
    Pc,                141   681  141  0   0    520    141
    Mz,                142     0  142  0  71    520    142
    MzPz,              143     0  143  0  71    520    143
    P&f,               144   408  144  0  95    520    144
    P&cf,              145   408  145  0   0    520    145
    P&if,              146   408  146  0   0    520    146
    P&s,               147   408  147  0   0    520    147
    P&m,               148   408  148  0   0    520    148
    P&w,               149   440  149  0  95    520    149
    P&wm,              150   440  150  0  95    520    150
    &m,                151     0  151 14   0    520    151
    &b,                152     0  152  0 103    520    152
    &mb,               153     0  153 14   0    520    153
    &e,                154     0  154 12  95    520    154
    &ee,               155     0  155 12   0    520    155
    &mbe,              156     0  156 12   0    520    156
    &h,                157     0  157 16   0    520    157
    &rh,               158     0  158 15   0    520    158
    &mr,               159     0  159 15   0    520    159
    M_,                160   378  160  0   0    520    160
    MDO,               161   448  161  0   0    520    161
    DO_,               162   448  162  0   0    520    162
    O_,                163   352  163  0   0    520    163
    Or,                164   352  164  0   0    520    164
    MD,                165   448  165  0   0    520    165
    MD_,               166   435  166  0   0    520    166
    DO,                167   448  167  0   0    520    167
    _s,                168   171  168  0   0    520    168
    Mm,                169   448  169  0   0    520    169
    _l,                170   171  170  0   0    520    170
    M_ml,              171   378  171  0   0    520    171
    _am,               172   814  172  0   0    520    172
    Yu,                173    32  173  0 135    520    173
    YXu,               174    32  174  0 119    520    174
    Xb,                175     0  175 18   0    520    175
    Xfh,               176    44  176  0   7    520    176
    Xq,                177     0  177 18  71    520    177
    Wr,                178   319  178  0   0    520    178
    Yp,                179   107  179  0   7    520    179
    Yg,                180   169  180  0   7    520    180
    Yam,               181   689  181  0   0    520    181
    Xg,                182    91  182  0  71    520    182
    Xm,                183   385  183  0   0    520    183
    YXg,               184   348  184  0  71    520    184
    H2O,               200   680  200  0   0     40    100
    
    DECO.PAT
    NAME                P1   CCA  HP  CCB PATT  MAJOR1 MINOR1
    
    Pipe,              186     0    0  0   0    530    186
        ,  (BLANK)     187     0    0  0   0    530    187
    Ball,              190     1  201  0   0    530    190
    Cog,   (TEETH)     191     1  201  0   0    530    191
    
    INDEX.PAT
    NAME                P1   CCA  HP  CCB PATT  MAJOR1 MINOR1
    
    Index map color,   199    47   17  0   0    530    199
    Index map color,   199    31    3  0   0    530    199
    Index map color,   199    79   57  0   0    530    199
    Index map color,   199   723   97  0   0    530    199
    
    
    LINE.PAT
    NAME                P1                 MAJOR1 MINOR1
    none                0                    0      0
    
    Entity_and_Attribute_Detail_Citation:
    Detailed unit descriptions are in files named "expl-*.txt" in http://pubs.usgs.gov/of/1992/ofr-92-0507/
    CONTACT.PAT
    Geologic map units (Source: OFR-92-0507)

    NAME
    Abbreviation of geologic map unit (Source: OFR-92-0507)

    ValueDefinition
    QaModern alluvium
    QgGravels and alluviums (Pinedale and Bull Lake age)
    QgoOlder gravels and alluviums (Pre-Bull Lake age)
    QeEolian deposits (Quaternary)
    QeoOlder eolian deposits (Quaternary)
    QdGlacial drift of Pinedale and Bull Lake glaciations
    QdoOlder glacial drift (Pre-Bull Lake age)
    QbBasalt Flows (Age <1.8 M.Y.)
    QTsaUnclassified surficial deposits and underlying Alamosa Formation
    QTaAncient Alluvium
    ToOgallala Formation
    TgvBouldery gravel on old erosion surfaces in front range and never summer mountains
    TaArikaree formation
    TwrWhite river formation or group
    ThHuerfano formation
    TcuCuchara formation
    TpcPoison canyon formation
    TduUpper part of Dawson arkose
    TbpBrowns park formation
    TtTroublesome formation
    TnpNorth park formation
    TosOligocene sedimentary rocks
    TuUinta formation
    TbBridger formation
    TgGreen river formation
    TfpParachute creek memeber - Green river formation
    TglLower part - Green river formation
    TglmLaney member - Green river formation
    TgtTipton tongue - Green river formation
    TgluLuman tongue - Green River formation
    TglwLower part of Green river formation
    TwWasatch formation
    TwcCathedral bluffs tongue - Wasatch formation
    TwnNiland tongue - Wasatch formation
    TwoWasatch formation and Ohio creek formation
    TfFort union formation
    TcCoalmont formation
    TmMiddle park formation exclusive of windy gap member
    TdDry union formation
    TsSanta Fe formation
    TosOligocene sedimentary rocks
    TeEocene prevolcanic sedimentary rocks
    TspSouth park formation
    TlpLos Pinos formation
    TsjSan Jose formation
    TnNacimiento formation
    TbbBasalt flows and associated tuff, breccia, and conglomerate of late-volcanic bimodal suite
    TbbiBasaltic intrusive rocks related to basalt flows
    TbrRhyolitic intrusive rocks and flows of late-volcanic bimodal suite
    TbrtAsh-flow tuff of late-volcanic bimodal suite
    TafAsh-flow tuff of main volcanic sequence
    TialIntra-ash flow andesitic lavas
    TiqlIntra-ash-flow quartz latitic lavas
    TplPre-ash-flow andesitic lavas, breccians, tuffs, and conglomerates
    TwmWall mountain tuff
    TvVolcanic rocks in northwestern Colorado
    TuiUpper Tertiary intrusive rocks
    TmiMiddle tertiary intrusive rocks
    TKdaDenver and Arapahoe formations
    TdvBasaltic flows in Denver formation near Golden
    TKdlDenver formation or lower part of Dawson arkose
    TKrRaton formation
    TKaAnimas formation
    TKecTelluride conglomerate of Eocene prevolcanic sedimentary rocks and Cimarron ridge formation
    TKiLaramide intrusive rocks
    KlLaramie formation
    KfFox hills sandstone
    KlfLaramie formation and fox hills sandstone
    KvtVermejo formation and Trinidad sandstone
    KpPerre shale, undivided
    KpuUpper unit - Pierre shale
    KplLower unit - Pierre shale
    KnNiobrara formation
    KcgCarlile shale, greenhorn limestone, and graneros shale
    KcColorado group
    KpgPierre shale, Niobrara, and Carlile, Greenhorn, and Graneros formations, undivided
    KdpDakota sandstone and Purgatoire formation
    KdDakota sandstone or group
    KlLance formation
    KmvWindy gap memeber
    KlsLewis shale
    KmvMesaverde formation, undivided
    KmvuUpper part - Mesaverde group
    KmvlLower part - Mesaverde group
    KwWilliams fork formation
    KiIles formation
    KscSego sandstone, Buck tongue of Mancos shale, and Castlegate sandstone
    KhHunter canyon formation
    KmgsMount Garfield formation and Sego sandstone
    KmMancos shale
    KmfmFrontier sandstone and Mowry shale members and intervening shale zone
    KfdFrontier sandstone and Mowry shale members of Mancos shale and Dakota sandstone
    KdbDakota sandstone and Burro canyon formation
    KkfKirtland shale and Fruitland formation
    KpclPictured cliffs sandstone and Lewis shale
    KchCliff house sandstone
    KmpMenefee formation and Point lookout sandstone
    KJdmDakota and Morrison formations
    KJdjDakota, Burro canyon, Morrison, and Junction creek formations
    KJdwDakota, Burro Canyon, Morrison, and Wanakah formations
    KJdrDakota group and Morrison and Ralston creek formations at mountain front between Boulder and Colorado Springs
    KJdeDakota and other formations depending on location
    KJdsDakota, Morrison, and Sundance formations
    JmMorrison formation
    JmjMorrison formation and Junction creek sandstone
    JmcMorrison formation and curtis formation
    JmwMorrison formation and Wanakah formation
    JmrMorrison formation and Ralston creek formation
    JmeMorrison formation and Entrada sandstone
    JmsMorrison formation and Sundance formation
    JmseMorrison formation, Summerville formation, and Entrada sandstone
    JmceMorrison, Curtis, and Entrada formations
    JmreMorrison, Ralston creek, and Entrada formations
    JmweMorrison, Wanakah, and Entrada formations
    J@gGlen canyon sandstone
    J@gcGlen canyon group and Chinle formation
    J@mgMorrison, Curtis, Entrada, and Glen canyon formations
    J@mcMorrison, Entrada, and Chinle formations
    @kcKayenta formation, Wingate sandstone, and Chinle formation
    @wcWingate sandstone and Chinle formation
    @mMoenkopi formation
    @chChugwater formation
    @ccChinle and Chugwater formations
    @cChinle formation
    @dDolores formation
    @dgDockum group
    @PlLykins formation
    @PsState bridge formation
    @PllLykins formation and Lyons sandstone
    @PjsJelm, Lykins, Lyons, and Satanka formations
    @PcsChinle and State bridge formations
    @PcpChinle, Moenkopi, and Park City formations
    @PrTriassic and Permian rocks
    @PdcDolores formation and Cutler formation
    @PmcMoenkopi formation and Cutler formation
    @&lfLykins, Lyons, and Fountain formations
    PpPark city formation
    PuUpper Permian rocks, undivided
    PcCutler formation
    MzMesozoic rocks
    MzPzMesozoic and Paleozoic rocks
    P&fFountain formation
    P&cfCasper formation and Lower part of Fountain formation
    P&ifIngleside formation and Fountain formation
    P&sSangre de Cristo formation
    P&mMaroon formation
    P&wWeber sandstone
    P&wmWeber sandstone and Maroon formation
    &mMinturn formation in west-central and south-central and other units of middle Pennsylvanian age
    &bBelden formation
    &mbMinturn and Belden formations
    &eeEvaporitic facies
    &mbeEvaporitic facies of Minturn and Belden formations in South Park and southward
    &hHermosa formation
    &rhRico and Hermosa formations
    &mrMorgan formation and Round Valley limestone
    M_Leadville limestone, Williams canyon limestone, Manitou limestone, and Sawatch quartzite
    MDOLeadville limestone, Williams canyon limestone, and one or more Ordovician formations
    DO_Williams canyon limestone, Manitou Limestone, and Sawatch quartzite
    O_Manitou limestone and Sawatch quartzite
    OrOne or more Ordovician formations
    MDLeadville limestone, Gilman sandstone, Dyer dolomite, and parting formation
    MD_Leadville, Gilman, Dyer, Parting, and Sawatch formations
    DOParting, Fremont, and Harding formations
    _sSawatch quartzite
    MmMadison limestone
    _lLodore formation
    M_mlMadison limestone and Lodore formation
    Md_Leadville Limestone, Ouray Limestone, Elbert formation, and Ignacio quartzite
    _amAlkalic nad mafic intrusive rocks in small plutons, and diabase dikes
    YuUinta mountain group
    YXuUncompahgre formation
    XbBiotitic gneiss, schist, and migmatite
    XfhFelsic and hornblendic gneiss
    XqQuartzite, conglomerate, and interlayered mica schist
    WrRed creek quartzite
    YpRocks of Pikes peak batholith
    YgGranitic rocks of 1,400-M.Y. age group
    YamAlkalic and mafic rocks in small plutons, and diabase and gabbro dikes
    XgGranitic rocks of 1,700-M.Y. age group
    XmMafic rocks of 1,700-M.Y. age group
    YXgGranitic rocks of 1,400- and 1,700-M.Y. age groups


Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

    The author wishes to thank Richard Taylor for storing and protecting the original Geologic Map of Colorado scribe sheets and negatives, Margaret Clemensen for assistance in preparing the explanation sheet and Scott Hogan and Kirsten Findell for review of the digital map; all are with the USGS.
    The author wishes to thank Randy Phillips of the Colorado State Geologic Survey for creating the TWETO.SHD shadeset.

  3. To whom should users address questions about the data?

    Gregory N. Green
    U.S. Geological Survey
    geologist
    MS 905, USGS, Denver Federal Center
    Denver, CO 80225
    USA

    (303) 236-5390 (voice)
    ggreen@usgs.gov


Why was the data set created?

This dataset was developed to provide geologic map GIS database of Colorado for use in future spatial analysis by a variety of users.
This database is not meant to be used or displayed at any scale other than 1:500,000.


How was the data set created?

  1. From what previous works were the data drawn?

    Tweto(1979) (source 1 of 1)
    Tweto, Ogden, 1979, The Geologic Map of Colorado: Special Publication The Geologic Map of Colorado, U.S.Geological Survey, Reston, Virginia.

    Type_of_Source_Media: map
    Source_Scale_Denominator: 500000
    Source_Contribution:
    Ogden Tweto created the state geologic map from new and existing geologic mapping. Greg Green converted this to ARC/INFO in 1992.

  2. How were the data generated, processed, and modified?

    Date: 1991 (process 1 of 2)
    This geologic map was prepared as part of a study of digital methods and techniques as applied to complex geologic maps. The geologic map was digitized from the original scribe sheets used to prepare the original paper Geologic Map of Colorado. Stable base contact prints of the scribe sheets were scanned on a Tektronix 4991 digital scanner. The scanner automatically converts the scanned image to an ASCII vector format. These vectors were transferred to a VAX minicomputer, where they were then loaded into ARC/INFO. Each vector and polygon was given attributes derived from the original 1979 geologic map. Both paper and digital versions are at 1:500,000 scale using the Lambert Conformal Conic map projection parameters of the State topographic base map.

    Date: 08-Apr-1999 (process 2 of 2)
    Creation of original metadata record

    Person who carried out this activity:

    U.S. Geological Survey
    Attn: Gregory N. Green
    MS 905, USGS, Denver Federal Center
    Denver, CO 80225
    USA

    1-303-236-5390 (voice)
    ggreen@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?

    Compiled mapping field checked

  2. How accurate are the geographic locations?

    Compiled from 1:250,000 scale maps

  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?

  5. How consistent are the relationships among the observations, including topology?

    Manual check against orginals


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:
This database is not meant to be used or displayed at any scale other than 1:500,000.
Any hardcopies utilizing these data sets shall clearly indicate their source. If the licensee has modified the data in any way they are obligated to describe the types of modifications they have performed on the hardcopy map. Licensee specifically agrees not to misrepresent these data sets, nor to imply that changes they made were approved by the U.S. Geological Survey.

  1. Who distributes the data set? (Distributor 1 of 1)

    U.S. Geological Survey Information Services
    Open-File Reports, PO Box 25286, Denver Federal Center
    Denver, CO 80225-0046
    USA

    1-888-ASK-USGS (voice)
    infoservices@usgs.gov

  2. What's the catalog number I need to order this data set?

    USGS Open-File Report 92-507

  3. What legal disclaimers am I supposed to read?

    This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey (USGS) editorial standard nor with the North American stratigraphic codes. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the USGS. Although these data have been used by the USGS and have been successfully imported into data base programs, no warranty, expressed or implied, is made by the USGS as to how successfully or accurately the data can be imported into any specific application software running on any specific hardware platform. The fact of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in connection therewith. This data base GIS is not meant to be used or displayed at any scale other than 1:500,000.

  4. How can I download or order the data?


Who wrote the metadata?

Dates:
Last modified: 31-Jul-2014
Last Reviewed: 27-Oct-2009
Metadata author:
Peter N Schweitzer
USGS Midwest Area
Geologist
Mail Stop 954
12201 Sunrise Valley Dr
Reston, VA 20192-0002
USA

703-648-6533 (voice)
703-648-6252 (FAX)
pschweitzer@usgs.gov

Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)


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