DESCRIPTION OF MAP UNITS
.2
Qs    Surficial deposits (Quaternary)
.3
Qb    Basalt (Quaternary)
.6
QTs   Surficial deposits (Quaternary and Tertiary)
.7
Ts    Sedimentary rocks and tuff (Tertiary)
.67
Te    Extrusive rocks (Tertiary)
.11
Ti    Intrusive rocks (Tertiary)
.9
Tj    Jasperoid (Tertiary)
.68
Tc    Conglomerate (Tertiary)
.99
PIPw  Wood River Formation of the Sun Valley Group
       (Lower Permian to Middle Pennsylvanian)
.101
PMc   Mixed carbonate and siliciclastic rocks
       (Lower Permian to Upper Mississippian)
.103
Mc    Copper Basin Formation (Upper and Lower Mississippian)
.102
Mw    White Knob Limestone (Upper Mississippian)
.128
Mcb   Carbonate bank units (Upper Mississippian)
.109
Mm    McGowan Creek Formation (Lower Mississippian)
.115
Dm    Milligen Formation (Devonian)
.114
Dc    Carbonate rocks (Devonian)
.116
DOs   Argillite and siltstone (Devonian to Ordovician)
.122
DSOc  Carbonate rocks (Devonian to Ordovician)
.117
DOc   Carbonate rocks (Lower Devonian to Ordovician)
.124
Ok    Kinnikinic Quartzite (Middle Ordovician)
.125
Os    Summerhouse Formation (Lower Ordovician)
.119
Oe    Ella Dolomite (Middle Ordovician)
.137
Oc    Clayton Mine Quartzite (Ordovician or older)
.126
OZq   Quartzitic rocks (Ordovician to Late Proterozoic)
.129
Ym    Metasedimentary rocks (Middle Proterozoic)
.128
XAg   Gneissic rocks (Early Proterozoic to Archean(?))