The data is supplied in ARC/INFO export and shape file formats.
DATABASE STRUCTURE - ARC/INFO ====================================
The database of the map consists of coverages, including corresponding INFO files:
friscopoly2 coverage:  Contains all contact lines and labelpoints for each polygon. In the coverage's friscopoly2.aat INFO file the CODE item provides a numeric code that specifies the geologic identity and positional quality of each contact line (e.g., fault, approximately located), and the P1 and P2 items are relic cartographic parameters from the GSMCAD compilation program. The friscopoly2.aat CODE values are defined below. In the friscopoly2.pat INFO file the CODE and P2 items are relic cartographic parameters from the GSMCAD program, the P1 item provides a numeric code that specifies the polygon's map unit identity, the TEXT item indicates the map unit label for each polygon, and the SYMBOL item defines the polygon color as chosen from the color524.shd shadeset (included in bundled file archive). The friscopoly2.pat P1 and TEXT items are listed below.
friscoline2 coverage:  Contains faults, fold axes, and other non-contact lines.  Faults that are contacts also appear in the friscopoly2 coverage. In the friscoline2.aat INFO file the CODE item provides a numeric code that specifies the geologic identity and positional quality for each type of line, the P1 and P2 items are relic cartographic parameters from the GSMCAD program, and the TEXT item describes the geologic identity, positional quality, and, in some cases, additional aspects of each line. The friscoline2.aat CODE and TEXT items are listed below.
friscopoint2 coverage: Contains points used for cartographically decorating lines, such as "ball-and-bar" fault symbols, and teeth on thrust faults.   In the INFO file friscopoint2.pat the CODE item defines a numeric code for each type of point decoration and the P1 and P2 items indicate the orientation (or strike azimuth) and, where appropriate, dip (or plunge) value associated with each point symbol. The friscopoint2.pat CODE items are listed below.
Auxiliary files:
color524.shd:  This shadeset file defines the rgb values of colors assigned to polygons in the friscopoly2 coverage (see SYMBOL item).
Readme.doc:  Disclaimer and list of included files.
Map unit labels listed here with associated numeric codes.  Unit names and fuller
descriptions of the units are in the explanatory pamphlet accompanying the map
and data files.
>P1  | GEOLOGIC MAP UNIT LABELS
>205 | af
>207 | dt
>148 | Qal
>165 | Qs
>164 | Qav
>163 | Qry
>161 | Qr
>176 | Qtr
>147 | Qf
>162 | Qt
>101 | Qc
>100 | Qac
>155 | Qls
>152 | Qg
>206 | Qop
>200 | Qtp
>201 | Qtb
>204 | Qgo
>210 | Qgm
>202 | Qgg
>175 | Qd
>153 | QTls
>220 | Tqp
>233 | Kpm
>232 | Kps
>231 | Kpl
>240 | Kn
>242 | Kb
>106 | Kd
>104 | Jm
>105 | Je
>107 | TrPcm
>162 | Xu
>266 | Xgg
>264 | Xgd
>259 | Xmg
>263 | Xhpg
>250 | Xbg
>255 | YXp
>257 | Yxdi
>262 | YXu
>265 | Xum
DEFINITION OF CODES IN THE DATABASE COVERAGES (CODES AND TEXT LISTED IN THE .AAT AND .PAT FILES)
>CODE |  TEXT (DEFINITION)
>  1  | contact; certain
>  2  | contact; approximately located
>  3  | contact; concealed
> 11  | fault; certain
> 12  | fault; approximately located
> 13  | fault; concealed
> 21  | normal fault; certain
> 22  | normal fault; approximately located
> 23  | normal fault; concealed
> 31  | thrust fault; certain; upthrown on right side
> 32  | thrust fault; approximate location; upthrown on right side
> 33  | thrust fault; concealed; upthrown on right side
> 41  | reverse fault; certain
> 42  | reverse fault; approximately located
> 43  | reverse fault; concealed
> 51  | syncline axis; certain
> 52  | syncline axis; concealed
> 61  | anticline axis; certain
> 62  | anticline axis; concealed
> 65  | strike-slip arrows
> 71  | dike or sill
> 72  | quartz vein
> 93  | water boundary
> 94  | scratch contact
> 95  | cross-section line
> 99  | map boundary
>200  | plunge arrow
>201  | bedding attitude (P1=strike azimuth 90 deg.CCW from dip direction, P2=dip angle)
>202  | strike and dip foliation symbol
>203  | plunge and bearing (lineation)symbol
>204  | anticline arrows(P1=orientation azimuth)
>205  | syncline arrows(P1=orientation azimuth)
>207  | bar and ball symbol(P1=orientation azimuth)
>208  | dip symbol on contact or fault (P1=strike azimuth, P2=dip angle)
>209  | left-lateral arrows (P1=orientation azimuth)
>210  | right-lateral arrows(P1=orientation azimuth)
>213  | strike and dip of joints symbol (P1=strike azimuth 90 deg.CCW from dip direction, P2=dip angle)
>217  | fold plunge arrow symbol(P1=orientation azimuth)
>219  | strike and dip of overturned beds symbol(P1=strike azimuth 90 deg.CCW from dip direction, P2=dip angle)
>220  | strike and dip, approximate (P1=strike azimuth 90 deg.CCW from dip direction, P2=dip angle)
>221  | vertical bed symbol(P1=orientation azimuth)
>222  | vertical foliation symbol(P1=orientation azimuth)
>230  | vertical joint symbol(P1=orientation azimuth)
>246  | strike with undetermined dip symbol(P1=strike azimuth 90 deg.CCW from dip direction, P2=dip angle)
>251  | strike and dip of foliation symbol(P1=strike azimuth 90 deg.CCW from dip direction, P2=dip angle)
>500  | Unit labels text & tag
>501  | Hidden unit tags
>502  | rock text
>510  | ordinary text
>701  | Splined text

http://pubs.usgs.gov/mf/2002/mf-2340/mf-2340pam.pdf