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INTRODUCTION
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Following is a list of coverages contained in this workspace used to generate
the included EPS file. Please note that not all features listed in the features 
list are present in the indicated coverage. This is merely a list of mappable 
features for which symbology has been developed. Use the Arc/Info frequency 
command to determine which items are present in a given coverage.

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CONTACTS COVERAGE (arcs, annotation and polygons)
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Contains polygon boundaries between mappable geologic units and polygon codes
for the mappable geologic units. Arcs are coded to represent certainty of 
contact location. Annotation is added to indicate geologic units. Annotation 
size is scaled to plot as an 8 point Helvetica font when plotted at the
indicated map scale. Special characters are used to represent specific geologic
formation ages (see note below).

** contacts.aat **
(arccode 5 6 c) --> contact arcs codes
con = contact
acon = approximately located contact
icon = inferred contact
ccon = concealed contact
fcon = fault contact
bord = map border

** contacts.pat **
(polycode 6 7 c) --> geologic unit polygon codes 
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**NOTE** Special characters are used to indicate Cambrian, Pennsylvanian and 
Triassic rocks. In order to display these characters special fonts should be
used with the following equivalent characters:
^ = Cambrian
& = Pennsylvanian
@ = Triassic 
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Idaho	Idaho
Qal	Alluvium of modern channels and flood plains
Qc	Colluvium
Qls	Landslide deposit
Qao	Alluvium, older, undivided
Qgdy	Glacial drift, younger
Qgdo	Glacial drift, older
Qafo	Alluvial fan deposit, older
QTgr	Gravel
Tr	Rhyolite or rhyolitic sediment
Ttr	Travertine; lake or hot-spring deposits
Tgr	Gravel
Tcg	Conglomerate
Ts	Sediment or sedimentary rocks, undivided
Tct	Tuffs of Challis Volcanic Group
Tcla	Latite of Challis Volcanic Group
Tccg	Conglomerate and sandstone of Challis Volcanic Group
Tci	Intrusive rocks of Challis Volcanic Group
Kbed	Divide Creek conglomerate, informal, of Beaverhead Group
Kf	Frontier Formation
Kbl	Blackleaf Formation
Kk	Kootenai Formation
Jme	Morrison Formation and Ellis Group, undivided
@td	Thaynes, Woodside, and Dinwoody Formations
&sb	Bloom member, informal, of Snaky Canyon Formation
&Mb	Bluebird Mountain Formation
Mrc	Railroad Canyon Formation
Mss	Surrett Canyon and South Creek Fms., undivided
Msp	Scott Peak Formation
Mmd	Middle Canyon Formation
Mlm	Lombard Formation, Kibbey Formation, and Madison Group
MDmt	McGowan Creek and Three Forks Formations, undivided
MDmj	McGowan Creek, Three Forks, and Jefferson Fms., undivided
Dj	Jefferson Formation
Obg	Granite of the Beaverhead Mountains Pluton
Ok	Kinnikinic Quartzite
Yl	Lemhi Group
XAg	Granite gneiss
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FAULTS COVERAGE (arcs and point markers)
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Contains mapped faults. Arcs are codes to represent specific fault types and 
certainty of surface location. Points denote spacial markers on faults (i.e., 
ball & bar and strike-slip arrows). Strike value rotates the point marker 
appropriately for the trend of the fault trace at the location of the point 
marker.

** faults.aat **
(arccode 5 6 c) --> fault arc code
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**NOTE** For reverse faults, thrust faults, and detachment faults, the teeth
are on the LEFT-HAND side of the arc based on the FNODE and the TNODE.
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faul = fault
afaul = approxiamtely located fault
ifaul = inferred fault
cfaul = concealed fault
rev = reverse fault
arev = approxiamtely located reverse fault
irev = inferred reverse fault
crev = concealed reverse fault
tst = thrust fault
atst = approxiamtely located thrust fault
itst = inferred thrust fault
ctst = concealed thrust fault
det = detachment fault
adet = approxiamtely located detachment fault
idet = inferred detachment fault
cdet = concealed detachment fault
cald = caldera margin
acald = approximately located caldera margin
icald = inferred caldera margin
ccalc = concealed caldera margin

** faults.pat ** --> fault point marker code
(ftype 4 5 c)
ball = ball and bar on downthrown block
rlss = right-lateral strike-slip fault
llss = left-lateral strike-slip fault
mylo = mylonite or shear zone

(strike 3 4 i) -- strike of fault at fault marker point location

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FOLDS COVERAGE (arcs and point markers)
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Contains arcs representing fold axial traces. Arcs are coded to represent 
certainty of location of axial trace. Points denote markers to indicate fold
type (i.e., anticline, syncline, etc.). Strike value rotates the point marker 
appropriately for the trend of the fold axial trace at the location of the point 
marker.

** folds.aat ** 
(arccode 5 6 c) --> fold arc code
fold = fold axis
afold = approximately located fold axis
ifold = inferred fold axis
cfold = concealed fold axis

** folds.pat **
(ftype 4 5 c) --> fold point marker code
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**NOTE** For overturned anticlines, overturned synclines and monoclines
the beds dip to the RIGHT while looking in the strike direction. For plunge
direction, the strike is in the direction of axial plunge.
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anti = anticline
syn = syncline
mono = monocline
otan = overturned anticline
otsy = overturned syncline
dome = dome
basi = basin
plun = plunge direction

(strike 3 4 i) --> strike of fold axis at fold marker point location

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STRIKE&DIP COVERAGE (point markers)
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Contains points where structural attitudes were measured. Points are coded to 
represent the type of planar feature measured. Strike value is used to rotate
the attitude marker symbol appropriately. Dip value is added as annotation next
to the attitude symbol. Annotation size is scaled to plot as an 6 point
Helvetica font when plotted at the indicated map scale.

** strike&dip.pat **
(atype 4 5 c)
bdg = bedding
fol = foliation
jnt = jointing

(strike 3 4 i) --> strike of layering
(dip 3 4 i) --> dip of layering

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GEOL_REGIONS COVERAGE (regions)
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Contains polygons for specific geologic features not included in the CONTACTS
coverage. Specific geologic features are separated into different REGIONS
subclasses. Subclass names indicate the geologic feature.

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**NOTE** Attribute items not needed for geol_regions.pat or geol_regions.aat.
Use regionlines and regionshades to plot these features.
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geol_regions.patCLINKER = regions of clinker
geol_regions.patHYDRO = regions with hydrothermal alteration
geol_regions.patPALEOSOL = regions of paleosol
geol_regions.patSILICIFIED = regions with silicification
geol_regions.patPEDIMENT = pediment surfaces

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GEOL_LINES COVERAGE (arcs)
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Contains arcs for specific geologic features not includedin the CONTACTS, 
FAULTS, or FOLDS coverage. Arcs are coded to indicate the type of geological
line feature.

** geology_lines.aat **
(arccode 5 6 c)
silcr = silcrete bed
vein = veins
dike1 = dikes and sills
cdik1 = concealed dikes and sills
dike2 = dikes and sills
cdik2 = concealed dikes and sills
dike3 = dikes and sills
cdik3 = concealed dikes and sills
dike4 = dikes and sills
cdik4 = concealed dikes and sills
dike5 = dikes and sills
cdik5 = concealed dikes and sills
dike6 = dikes and sills
cdik6 = concealed dikes and sills
vein = veins
cvein = concelaed veins
scarp = scarps
terr = terrace scarp
anriv = ancient river channel axis
glax = glacial extent
glam = glacial meltwater channel scarp
mine = open pit mine
linem = geological linement determined from air photos

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GEOL_POINTS COVERAGE (point markers)
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Contains geologic point features not included in other coverages. Point code
indicates the type of feature.
** geology_points.pat **
(ptcode 5 6 c)
brecc = sedimentary breccia
