Entity_and_Attribute_Overview:
The data is supplied in ARC/INFO export format and ArcView shapefile format.
DATABASE STRUCTURE - ARC/INFO ====================================
This GIS database includes related look-up tables, which store
detailed attribute information. This database structure is more fully
described in USGS OFR 99-438. The GIS database structure used in the
database includes symbol and pattern items in coverage point, polygon
(PAT), and arc (AAT)attribute tables for user convenience. Arc/Info
relates for each coverage are saved in a file named <covername>.rel. Use
the RELATE command with the restore argument at the arc prompt to make the
relates active. Alternatively, in Arctools, use the Relate environment:
open dialog in the Manage - Relates flyout menu under the Arctools menu to
make the relates active.
denver coverage: Contains all contact lines and label points for each
geologic polygon. In the denver.pat INFO file the SOURCE item provides a
numeric code used to identify the data source for the rock unit. Complete
references for the sources listed are listed in the denver.ref file. The
LABEL item indicates the rock unit label (abbreviation) used to label unit
on map. The MLABEL item indicates the rock unit label using the GeoAge
version 1.2 font, used to indicate the rock unit label using geologic age
letter symbols associated with the age of the lithologic units (for
example: Triassic, Pennsylvanian, Cambrian). The DESC item defines formal
or informal unit name. The SYMBOL item contains the shadeset symbol
number used by ArcInfo to plot a filled/shaded polygon. The symbol
numbers in this item refer to the wpgcmykg.shd shadeset included with the
dataset. The PATTERN item contains the shadeset symbol used by ArcInfo to
plot a patterned polygon. The symbol numbers in this item refer to the
plotter.shd shadeset included with ArcInfo V.8.1.
In the denver.aat INFO file the LINECODE item provides a numeric code used
to identify type of linear feature. Linecodes less than 100 are used for
contacts and boundaries which are described in the denver.con file.
Linecodes greater than 100 are used for structures that are described in
the denver.str file. The NAME item lists the name given to structural
feature. The SOURCE item lists the numeric code used to identify the data
source for the linear feature. Complete references for the sources are
listed in the denver.ref file.
Related look-up table files are denver.con, denver.str, denver.ru, and
denver.ref. In the denver.con INFO file, the LINECODE item indicates the
numeric code (a value less than 100) used to identify type of contact or
boundary. The SYMBOL item lists the line symbol number used by ArcInfo to
plot the line (symbol numbers refer to the geol_sfo.lin lineset included
with the dataset). The TYPE item lists the major type of line (for
example, contact, State boundaries, lines of latitude and longitude used
for neatlines). The MODIFIER item lists the line type modifier, (that is,
approximate, concealed, or gradational). No entry implies 'known.' The
CERTAINTY item lists the degree of certainty of contact or boundary, (that
is, inferred or uncertain). No entry implies 'certain.' The DESC item
lists the written description or explanation of the contact or boundary.
In the denver.str INFO file, the LINECODE item indicates the numeric code
(a value greater than 100) used to identify type of structure. The SYMBOL
item lists the line symbol number used by ArcInfo to plot the line (symbol
numbers refer to the geol_sfo.lin lineset included with the dataset). The
TYPE item lists the major type of line, (for example, fault or fold-axis).
The HORIZONTAL item refers to the type of horizontal fault movement (for
example, left-lateral or right-lateral). No entry implies 'unknown' or no
strike-slip movement. The VERTICAL item refers to the type of vertical
fault movement (for example, normal). No entry implies 'unknown' or no
dip-slip movement. The FOLD item refers to the type of fold, (for
example, anticline or syncline). The PLUNGE item refers to the type of
plunge on fold, (that is, horizontal, plunging, plunging in, or plunging
out). The ACCURACY item refers to the line type modifier indicating
degree of accuracy, (that is, approximately located, concealed,
gradational). No entry implies 'certain.' The CERTAINTY item lists the
degree of certainty of structure, (that is, inferred, uncertain). No
entry implies 'certain.' The DESC item lists the written description or
explanation of the structure. In the denver.ru INFO file, the UNIT item
refers to the numeric code used to identify the rock unit. The LABEL item
refers to the rock unit label (abbreviation) used to label unit on map.
The DESC1 item lists the formal or informal unit name. The DESC2 item
contains a parsed portion of the description of the unit. The DESC3 item
contains a parsed portion of the description of the unit. The DESC4 item
contains a parsed portion of the description of the unit. In the
denver.ref INFO file, the SOURCE item lists the numeric code used to
identify the data source. The SCALE item lists the scale of the source
map. (This value is the denominator of the proportional fraction that
identifies the scale of the map that was digitized or scanned to produce
the digital map.) The AUTHORS item lists the author(s) or compiler(s) of
source map entered as last name, first name or initial, and middle
initial. The YEAR item lists the source (map) publication date. The
REFERENCE item lists the remainder of the reference in USGS reference
format.
The INFO structure of these files is listed below:
>DENVER.PAT:
>
>COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME
> 1 AREA 8 18 F 5
> 9 PERIMETER 8 18 F 5
> 17 DENVER# 4 5 B -
> 21 DENVER-ID 4 5 B -
> 25 SOURCE 4 4 I -
> 29 LABEL 10 10 C -
> 39 MLABEL 10 10 C -
> 49 DESC 100 100 C -
> 149 SYMBOL 3 3 I -
> 152 PATTERN 4 4 I -
>DENVER.AAT:
>
>COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME
> 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 DENVER# 4 5 B -
> 29 DENVER-ID 4 5 B -
> 33 LINECODE 3 3 I -
> 36 NAME 80 80 C -
> 116 SOURCE 4 4 I -
> 120 SYMBOL 3 3 I -
>DENVER.CON:
>
>COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME
> 1 LINECODE 3 3 I -
> 4 SYMBOL 3 3 I -
> 7 TYPE 10 10 C -
> 17 MODIFIER 20 20 C -
> 37 CERTAINTY 15 15 C -
> 52 DESC 100 100 C -
>DENVER.STR:
>
>COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME
> 1 LINECODE 3 3 I -
> 4 SYMBOL 3 3 I -
> 7 TYPE 10 10 C -
> 17 HORIZONTAL 20 20 C -
> 37 VERTICAL 20 20 C -
> 57 FOLD 15 15 C -
> 72 PLUNGE 15 15 C -
> 87 ACCURACY 15 15 C -
> 102 CERTAINTY 15 15 C -
> 117 DESC 100 100 C -
>DENVER.RU:
>
>COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME
> 1 LABEL 10 10 C -
> 11 DESC1 200 200 C -
> 211 DESC2 200 200 C -
> 411 DESC3 200 200 C -
> 611 DESC4 200 200 C -
>DENVER.REF:
>
>COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME
> 1 SOURCE 4 4 I -
> 5 SCALE 8 8 I -
> 13 AUTHORS 200 200 C -
> 213 YEAR 4 4 I -
> 217 REFERENCE 250 250 C -
>Coding of LABEL and DESC attributes in the denver coverage:
>LABEL | DESC
>Cr | Unnamed rocks (Cambrian)
>Fault zone | Fault zone - Zone of intense fault brecciation, usually
associated with numerous en echelon faults
>JPml | Morrison, Ralston Creek, and Lykins Formations,
undifferentiated (Upper Jurassic to Upper Permian)
>Jmr | Morrison and Ralston Creek Formations (Upper Jurassic)
>Kcgg | Carlile Shale, Greenhorn Limestone, and Graneros Shale,
undifferentiated (Upper Cretaceous)
>Kd | Dakota Group (Lower Cretaceous)
>Kf | Fox Hills Sandstone (Upper Cretaceous)
>Kl | Laramie Formation (Upper Cretaceous)
>Kn | Niobrara Formation (Upper Cretaceous)
>Kp | Pierre Shale (Upper Cretaceous)
>PPf | Fountain Formation (Lower Permian to Middle Pennsylvanian)
>PPfl | Lyons Sandstone and Fountain Formation, undifferentiated
>Ply | Lyons Sandstone (Permian)
>Qb | Broadway Alluvium (upper Pleistocene)
>Qco | Colluvium (upper Holocene)
>Qes | Windblown sand (lower Holocene to upper Pleistocene)
>Ql | Loess (upper Pleistocene)
>Qlo | Louviers Alluvium (upper Pleistocene)
>Qls | Landslide deposits (Holocene to Middle? Pleistocene)
>Qn | Nussbaum Alluvium (Pleistocene)
>Qp | Post-Piney Creek and Piney Creek Alluvium (Upper Holocene)
>Qrf | Rocky Flats Alluvium (Pleistocene)
>Qs | Slocum Alluvium (Pleistocene)
>Qv | Verdos Alluvium (Pleistocene)
>TKd | Denver Formation (Paleocene and Upper Cretaceous)
>TKda | Dawson and Arapahoe Formations (Paleocene to Upper
Cretaceous)
>TRPl | Lykins Formation (Lower Triassic and Upper Permian)
>Tcr | Castle Rock Conglomerate (lower Oligocene)
>Tg | High-level gravel deposits (Pliocene to Oligocene)
>Tgm | Green Mountain Conglomerate (Paleocene)
>Ts | Shoshonite (lower Paleocene)
>Twm | Wall Mountain Tuff (lower Oligocene)
>Xa | Amphibolite, hornblendite, and related rocks (Precambrian
X)
>Xbc | Boulder Creek Granodiorite (Precambrian X)
>Xfg | Felsic gneiss (Precambrian X)
>Xg | Gneiss (Precambrian X)
>Xq | Quartzite (Precambrian X)
>Xqm | Quartz monzonite (Precambrian X)
>Xs | Schist (Precambrian X)
>YXp | Pegmatite (Precambrian Y and X)
>Ypp | Pikes Peak Granite (Precambrian Y)
>Ysp | Silver Plume Quartz Monzonite (Precambrian Y)
>w | Open water
>Coding of LINECODE and NAME attributes in the boulder coverage:
>LINECODE | NAME
> 1 | Contact - Certain
> 41 | Shoreline
> 81 | Map boundary
> 101 | Fault - Certain
> 103 | Fault - Concealed
> 171 | Thrust fault - Certain
> 173 | Thrust fault - Concealed