Entity_and_Attribute_Overview:
The data is supplied in ARC/INFO export 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.
boulder coverage: Contains all contact lines and label points for each geologic polygon. In the boulder.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 boulder.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 Arc/Info v.8.1.
In the boulder.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 that are described in the boulder.con 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 boulder.ref file.
Related look-up table files are boulder.con, boulder.str, boulder.ru, and boulder.ref. In the boulder.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 Arc/Info 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 list 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, (for example, inferred or uncertain). No entry implies 'certain.' The DESC item lists the written description or explanation of the contact or boundary. In the boulder.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 Arc/Info 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 motion. The VERTICAL item refers to the type of vertical fault movement, (for example, normal). No entry implies 'unknown' or no dip-slip motion. 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, (for example, approximately located, concealed, or gradational). No entry implies 'certain.' The CERTAINTY item lists the degree of certainty of structure, (for example, inferred or uncertain). No entry implies 'certain.' The DESC item lists the written description or explanation of the structure. In the boulder.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. The DESC5 item contains a parsed portion of the description of the unit. The DESC6 item contains a parsed portion of the description of the unit. The DESC7 item contains a parsed portion of the description of the unit. In the boulder.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:
>BOULDER.PAT:
>
>COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME
> 1 AREA 8 18 F 5
> 9 PERIMETER 8 18 F 5
> 17 BOULDER# 4 5 B -
> 21 BOULDER-ID 4 5 B -
> 25 SOURCE 4 4 I -
> 29 LABEL 10 10 C -
> 39 MLABEL 10 10 C -
> 49 DESC 180 180 C -
> 229 SYMBOL 3 3 I -
> 232 PATTERN 4 4 I -
>BOULDER.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 BOULDER# 4 5 B -
> 29 BOULDER-ID 4 5 B -
> 33 LINECODE 3 3 I -
> 36 NAME 80 80 C -
> 116 SOURCE 4 4 I -
> 120 SYMBOL 3 3 I -
>BOULDER.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 -
>BOULDER.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 -
>BOULDER.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 -
> 811 DESC5 200 200 C -
> 1011 DESC6 200 200 C -
> 1211 DESC7 200 200 C -
>BOULDER.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 boulder coverage:
>LABEL | DESC
>Fault zone | Brecciated rock
>JTRmj | Morrison Formation (Upper Jurassic), Canyon Springs Member of Sundance Formation (Upper Jurassic), and Jelm Formation (Upper Triassic)
>Kcg | Carlile Shale (Upper Cretaceous), Greenhorn Limestone (Upper Cretaceous), and Graneros Shale (Upper and Lower Cretaceous)
>Kd | Dakota Group (Lower Cretaceous)
>Kfh | Fox Hills Sandstone (Upper Cretaceous)
>Kl | Laramie Formation (Upper Cretaceous)
>Kn | Niobrara Formation (Upper Cretaceous)
>Kph | Hygiene Sandstone Member of Pierre Shale (Upper Cretaceous)
>Kpl | Lower shale member of Pierre Shale (Upper Cretaceous)
>Kpm | Middle shale member of Pierre Shale (Upper Cretaceous)
>Kprl | Richard Sandstone Member, unnamed shale member, Larimer Sandstone Member, unnamed shale member, and Rocky Ridge Sandstone Member of Pierre Shale (Upper Cretaceous)
>Kptz | Upper transition member of Pierre Shale (Upper Cretaceous)
>Kpu | Upper shale member of Pierre Shale (Upper Cretaceous)
>PPf | Fountain Formation (Permian and Pennsylvanian)
>Pi | Ingleside Formation (Permian)
>Ply | Lyons Sandstone (Permian)
>Psi | Satanka and Ingleside Formations (Permian)
>Qb | Broadway Alluvium (Pinedale Glaciation, Pleistocene)
>Qc | Colluvium (upper Holocene to Pleistocene)
>Qe | Eolium (windblown clay, silt (loess), sand, and granules) (upper Holocene to Bull Lake Glaciation)
>Ql | Landslide deposits (Holocene to Pleistocene)
>Qlo | Louviers Alluvium (Bull Lake Glaciation, Pleistocene)
>Qpc | Piney Creek Alluvium (upper Holocene)
>Qpp | Post-Piney Creek Alluvium (upper Holocene)
>Qprf | Pre-Rocky Flats Alluvium (Nebraskan(?) Glaciation, Pleistocene)
>Qrf | Rocky Flats Alluvium (Aftonian Interglaciation or Nebraskan Glaciation, Pleistocene)
>Qs | Slocum Alluvium (Sangamon Interglaciation or Illinoian Glaciation, Pleistocene)
>Qt | Talus (upper Holocene to Pleistocene)
>Qv | Verdos Alluvium (Yarmouth Interglaciation or Kansan Glaciation, Pleistocene)
>TKda | Denver (Paleocene and Upper Cretaceous) and Arapahoe (Upper Cretaceous) Formations
>TRPl | Lykins Formation (Triassic and Permian)
>Tb | Boulder deposits (Pliocene?)
>Ti | Rhyodacite and basalt (Paleocene)
>Tqm | Quartz monzonite (Eocene)
>Xa | Amphibolite (Precambrian X)
>Xb | Porphyroblastic biotite schist (Precambrian X)
>Xbc | Boulder Creek Granodiorite (Precambrian X)
>Xk | Knotted mica schist (Precambrian X)
>Xq | Quartzofeldspathic schist and gneiss interbedded with mica schist and gneiss (Precambrian X)
>Xt | Tonalite (Precambrian X)
>YXp | Pegmatite (Precambrian Y or X)
>Ysp | Silver Plume Quartz Monzonite (Precambrian Y)
>af | Artificial fill
>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
bfltmove coverage: Contains points recording the locations of fault decorations indicating upthrown and downthrown blocks. In the bfltmove.pat INFO file the PTTYPE item lists the type of point symbol, U, upthrown block; D, downthrown block. The LABEL item indicates the letter U or D used to label the fault decoration on the map. The SYMBOL item lists the marker symbol used by ArcInfo to identify the type of structural map symbol(symbol numbers refer to the geoscamp2.mrk markerset). The SOURCE item lists the numeric code used to identify the data source.
The INFO structure of these files is listed below:
>BFLTMOVE.PAT:
>
>COLUMN ITEM NAME WIDTH OUTPUT TYPE N.DEC ALTERNATE NAME
> 1 AREA 8 18 F 5
> 9 PERIMETER 8 18 F 5
> 17 BFLTMOVE# 4 5 B -
> 21 BFLTMOVE-ID 4 5 B -
> 25 PTTYPE 80 80 C -
>105 LABEL 10 10 C -
>115 SOURCE 4 4 I -
In the coverage's bfltmove.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.
> BFLTMOVE.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 -