Map of glacial limits and possible refugia in the southern Alexander Archipelago, Alaska, during the late Wisconsin glaciation

Online link https://geo-nsdi.er.usgs.gov/metadata/map-mf/2424/metadata.faq.html
Description During the late Wisconsin glaciation (circa 26,000-13,000 carbon-14 yr BP) the Cordilleran glacier complex formed vast ice fields and large glaciers along the crest of the Coast Mountains. As these glaciers flowed west to the Pacific Ocean, they were joi
Originators Carrara, Paul E.; Ager, Thomas A.; Baichtal, J. F.; and Van Sistine, Darren R.
Publication U.S. Geological Survey Miscellaneous Field Studies Map MF-2424

Related topics

States or counties

Overview of attributes

The data files were generated using ArcInfo, consequently they
contain a number of fields that are created and maintained
specifically for that software package.  The actual field
characteristics are as follows:
>Polygonal features of the geologic data in SKMPOLY.PAT:
>
>COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC
>    1  AREA                   8    18     F      5
>    9  PERIMETER              8    18     F      5
>   17  SKMPOLY#               4     5     B      -
>   21  SKMPOLY-ID             4     5     B      -
>   25  SYMBOL                 8     8     I      -
>   33  LABEL                 17    17     C      -
>   50  TEXT                  17    17     C      -
>   67  DESCRIPTION           64    64     C      _
>
>Linear features of the geologic unit data in SKMPOLY.AAT:
>
>COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC
>    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  SKMPOLY#               4     5     B      -
>   29  SKMPOLY-ID             4     5     B      -
>   33  DESCRIPTION           80    80     C      -
>  113  SYMBOL                 3     3     I      -
>  116  SYMSET                10    10     C      -
>
>Features of the geologic line data in SKMLINE.AAT:
>
>COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC
>    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  SKMLINE#               4     5     B      -
>   29  SKMLINE-ID             4     5     B      -
>   33  DESCRIPTION           80    80     C      -
>  113  SYMBOL                 3     3     I      -
>  116  SYMSET                10    10     C      -
>
>Features of the geologic point data in SKMPNT.PAT:
>
>COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC
>    1  AREA                   8    18     F      5
>    9  PERIMETER              8    18     F      5
>   17  SKMPNT#                4     5     B      -
>   21  SKMPNT-ID              4     5     B      -
>   25  DESCRIPTION           80    80     C      -
>  105  SYMBOL                 3     3     I      -
>  108  STRIKE                 3     3     I      -
>  111  DIP                    3     3     I      -
>  114  SYMSET                10    10     C      -
>  124  DETAILS               50    50     C      -
Field values in this database commonly occur in combinations
that are described by the following table.  FREQUENCY here
represents the number of occurrences within the data of the
combination of field values shown.  Characters in the LABEL
field are used to signify special geologic symbols, # signifies
Triassic, @ signifies Pennsylvanian, and { signifies Cambrian.
> Field value combinations in SKMPOLY.PAT
> FREQUENCY SYMBOL LABEL            TEXT             DESCRIPTION
> 14        4      Qsw              Qsw              Sheetwash deposits
> 13        5      Qto              Qto              Older terrace alluvium
> 17        8      af               af               artificial fill
> 24        9      Qta              Qta              Talus deposits
> 2         10     Qlo              Qlo              Loess
> 100       12     Qc               Qc               Colluvium
> 37        13     Qti              Qti              Till
> 5         14     Qtt              Qtt              Oldest terrace alluvium
> 4         15     Qdy              Qdy              Younger debris-flow deposits
> 53        16     Qls              Qls              Landslide deposits
> 11        18     Kw               Kw               Williams Fork Formation
> 82        25     Qac              Qac              Undivided alluvium and colluvium
> 2         28     Qlo/Qp           Qlo/Qp           Loess and pediment deposits
> 4         29     Qlo/Qty          Qlo/Qty          Loess and younger terrace alluvium
> 4         30     QTd              QTd              Oldest debris-flow deposits
> 42        32     Qfy              Qfy              Younger fan alluvium and debris-flow deposits
> 5         33     Qfo              Qfo              Older fan alluvium and debris-flow deposits
> 1         34     Qlo/Qtt          Qlo/Qtt          Loess and oldest terrace alluvium
> 17        41     {s               Cs               Sawatch Quartzite
> 13        47     Tcc              Tcc              Conglomerate of Canyon Creek
> 7         52     Qlo/Qfo          Qlo/Qfo          Loess, older fan alluvium and debris-flow deposits
> 4         64     Xg               Xg               Granodiorite gneiss
> 19        71     Twu              Twu              Upper member Wasatch Formation
> 7         91     Dcp              Dcp              Parting Formation
> 21        101    O{u              OCu              Manitou Dolomite and Dotsero Formation, undivided
> 7         104    TKu              TKu              Undivided unit
> 2         107    Tgy              Tgy              Younger gravel
> 2         108    Tgo              Tgo              Older gravel
> 9         130    Tb               Tb               Basalt and trachybasalt
> 1         143    {d               Cd               Dotsero Formation
> 7         156    Twl              Twl              Lower member Wasatch Formation
> 8         168    Dc               Dc               Chaffee Group
> 8         177    Dcd              Dcd              Dyer Formation
> 27        241    @e               Pe               Eagle Valley Formation
> 13        243    @ee              Pee              Eagle Valley Evaporite
> 1         313    Colorado River   Colorado River   Colorado River
> 1         313    Porter Reservoir Porter Reservoir Porter Reservoir
> 16        316    Pms              Pms              Schoolhouse Member Maroon Formation
> 9         320    P@m              PPm              Main body Maroon Formation
> 16        323    Ml               Ml               Leadville Limestone
> 8         327    @ml              Pml              Lower member Maroon Formation
> 14        365    Je               Je               Entrada Sandstone
> 14        372    #Ps              TRPs             State Bridge Formation
> 12        387    Kml              Kml              Lower member Mancos Shale
> 13        398    Kic              Kic              Cozzette and Corcoran Sandstone members Iles Formation
> 11        401    Ki               Ki               Main body Iles Formation
> 5         411    Ks               Ks               Sandstone, siltstone, claystone, and conglomerate
> 10        427    Jm               Jm               Morrison Formation
> 11        429    Qfp              Qfp              Flood-plain and stream- channel deposits
> 15        442    Kmn              Kmn              Niobrara member Mancos Shale
> 34        444    Qdo              Qdo              Older debris-flow deposits
> 1         451    Qp               Qp               Pediment deposit
> 8         454    Kd               Kd               Dakota Sandstone
> 4         476    Xf               Xf               Felsic gneiss
> 27        483    Kmu              Kmu              Upper member Mancos Shale
> 1         500    Qlo/Qto          Qlo/Qto          Loess and older terrace alluvium
> 18        510    #c               TRc              Chinle Formation
> 5         515    @b               Pb               Belden Formation
> 1         524    MDu              MDu              Leadville Limestone and Chaffee Group, undivided
> Field value combinations in SKMPOLY.AAT
> FREQUENCY   SYMBOL      SYMSET      DESCRIPTION
> 2           1           geol_sfo    Wheeler coal bed-certain
> 1768        1           geol_sfo    Contact-certain
> 4           3           geol_sfo    Wheeler coal bed-approximately located
> 39          3           geol_sfo    Contact-approximately located
> 13          15          geol_sfo    Thrust fault-certain
> 1           23          geol_sfo    Thrust fault-approximately located
> 9           25          geol_sfo    Thrust fault-concealed
> 100         51          geol_sfo    Normal fault-certain
> 2           59          geol_sfo    Clinkered Wheeler coal bed-certain
> 16          185         geol_sfo    Normal fault-approximately located
> 109         186         geol_sfo    Normal fault-concealed
> 29          190         geol_sfo    Strike-slip fault, right-lateral located offset-concealed
> 47          222         geol_sfo    Water boundary
> 28          225         alcwrg      Intrusive contact-certain
> 216         227         geol_sfo    Map boundary
> 42          229         alcwrg      Intrusive contact-concealed
> Field value combinations in SKMLINE.AAT
> FREQUENCY   SYMBOL      SYMSET      DESCRIPTION
> 9           60          geol_sfo    Anticline-certain
> 2           63          geol_sfo    Anticline-concealed
> 14          164         geol_sfo    Crest line of moraine, sense of symmetry unspecified
> 1           94          geol_sfo    Syncline-approximately located
> 18          92          geol_sfo    Syncline-certain
> 10          95          geol_sfo    Syncline-concealed
> 1           227         geol_sfo    cross-section line A
> 1           227         geol_sfo    cross-section line B
> Field value combinations in SKMPNT.PAT
> FREQUENCY   SYMBOL      SYMSET      DESCRIPTION
> 3           22          water2      Dry hole-unsuccessful hole drilled during hydrocarbon exploration
> 5           1           geoscamp2   Horizontal bedding
> 7           7           alcgeol     Inclined bedding-showing approximate strike and dip
> 483         2           geoscamp2   Inclined bedding-showing strike and dip
> 16          103         usgs        Inclined tunnel or adit
> 44          6           geoscamp2   Overturned bedding-showing strike and dip
> 1           9           usgs2       Prospect pit
> 3           81          geoscamp2   Strike and dip of foliation
> 1           70          geoscamp2   Strike and dip of inclined foliation where layering is parallel to foliation
> 1           71          geoscamp2   Strike of vertical foliation where layering is parallel to foliation
> 7           4           geoscamp2   Vertical bedding-showing strike
> 1           53          plotter     Fossil locality

http://pubs.usgs.gov/mf/2002/mf-2389/mf-2389_pam_508.pdf

POLYGONGONAL FEATURES OF THE GEOLOGIC DATA

Geologic units and other land-cover polygonal features.

Label Definition
SYMBOL Integer index of the fill color for this polygon. The index indicates an element of the shade set color524.shd.
LABEL Map unit label. This is a character field of width 17. The typeface used is fnt027, included with this package. Some geologic map units are labeled using symbols that are not represented in standard type faces, such as the symbols for the Cambrian, Pennsylvanian, and Triassic periods. The font fnt027, included with the ArcInfo export files in this database package, is used to draw these symbols.
TEXT Map-unit label expressed in the nearest ASCII equivalent of the unit label that is actually shown on the printed map sheet. Some geologic unit labels contain symbols that cannot be represented using ASCII, such as the symbols for the Cambrian, Pennsylvanian, and Triassic periods. The proper symbols are contained within the font file fnt027.
DESCRIPTION Short textual description of the map unit. Complete descriptions of the map units are normally provided in an accompanying report. This description is typically shown on the legend printed on the map sheet.

LINEAR FEATURES OF THE GEOLOGIC DATA

Linear geologic features bounding geologic unit polygons, chiefly contacts and faults.

Label Definition
DESCRIPTION Text indicating the type of linear geologic feature.
SYMBOL Integer index of the line type used for plotting the feature on the map. The line type is given by the symbol set (whose name is specified in an accompanying attribute) and this index value.
SYMSET Name of the symbol set containing the appropriate line style to be used for plotting this feature.

FEATURES OF THE GEOLOGIC LINE DATA

Linear geologic features, chiefly fold axes, moraine crest lines, and lines of cross section, that do not bound the geologic unit polygons.

Label Definition
DESCRIPTION Text indicating the type of linear geologic feature.
SYMBOL Integer index of the line type used for plotting the feature on the map. The line type is given by the symbol set (whose name is specified in an accompanying attribute) and this index value.
SYMSET Name of the symbol set containing the appropriate line style to be used for plotting this feature.

FEATURES OF THE GEOLOGIC POINT DATA

Point geologic features of all types, including observations and measurements of geologic structure, geodetic control points, mineral and fossil occurrences, small geologic structures, and relevant manmade features.

Label Definition
DESCRIPTION Text indicating the type of geologic point feature.
SYMBOL Integer index of the point type used for plotting the feature on the map. The point type is given by the symbol set (whose name is specified in an accompanying attribute) and this index value.
SYMSET Name of the symbol set containing the appropriate symbol to be used for plotting this feature.