BULLETIN NO. 227 PL. 
LEGEN D 
( continued I 
IGNEOUS 
ROCKS 
^3 
Basic dikes 
,o\\y\ - 
VV'a\» 
m 
"~\ _/ - r^QuyUi. -J 
Lxabbro-dionte 
mm m -J 
MM Dionte- 
porphyiy 
p 
J " ' 
PoLoai volcanic 
formation 
Silverton volcanic 
formation 
SanJuan 
formation 
Older 
rhvolilt 
v.. 
Wilis 
Fa u 1 ts 
Landslide 
boundaries 
EGIOX AROUND TELLURIDE. COL' 
ENTING GEOLOGIC FORMATIONS 
2 miles 
3 kilometers 
00 feet 
level 
