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n r, .x rro T1V0ADTMFiNT nF THE INTERIOR <br />BULLETIN 1208 <br />PLATE 2 <br />U111 LI✓ va... �� .- -- -- <br />GEOLOGICAL SURVEY <br />105 31'15" 105 °30 <br />105 °32'30" ! _ � — <br />39 °46'15° EXPLANATION <br />39 ° 4615" 2 / % I I ( \� _i ��� r i yr c <br />''V ` \ ? oo y /� > > ` Alluvium Colluvium o <br />Porphyritic intrusive rocks r <br />4 /A /I 0 l ; `� _1 p �� - �' �� ♦ I n <br />0 a5 /� - � �li� l\' <br />l <br />i lJ� <br />0iF " ..4E. 5° - <br />,Biotite- muscovite granite <br />Granodiorlte and quartz diorite m <br />y <br />rs e6 <br />106 °33'45" 9 ( ,vr> --a _ o I moo -- � G v 1 105 °30' r; s 4 a <br />U <br />, - , - „� , ; 4J 4J <br />°� Biotite gneiss and granite gneiss W <br />f\ y <br />> Sq �. ��` ! vv1`eo Includes some pegmatite, amphibo- d <br />lite, Bale- silicate gneiss, and quartz <br />gneiss <br />,' r i w>� —\ \�. �0 <T !"� --� ^' I l yQ \\ \ <br />39 °45' \\ / <br />w r / /'� y ! I a - Mierocline gneiss <br />Includes some amphibolite <br />0 ( 5 <br />75 10 <br />_ v > <br />e �I <br />IDAHO SPRINGS <br />r � <br />i', i / 105 °31'15" <br />/ <br />r _ <br />ff, 56 <br />l` 10.000' R <br />A <br />A' <br />9000' <br />8000' <br />7000' <br />Fault, showing dip <br />Anticline <br />Showing trace of axial plane <br />Syncline <br />Showing trace of axial plane <br />Overturned antieline <br />Showing trace of axial plane and <br />direction of dip of limbs <br />Overturned syncline <br />Showing trace or axial plane and <br />direction of dip of limbs <br />3 <br />Strike and dip of foliation <br />o > z2�,io <br />Strike and dip of foliation <br />and plunge of lineations <br />:6 <br />Strike and dip of foliation <br />and horizontal lineation <br />11 J..11111..L i <br />Approximate northwest limit of <br />zone of intense younger Precam- <br />brian deformation <br />- 10,000' <br />9000' <br />8000' <br />7000' <br />A A II G. I. <br />and others, 1953 -54 <br />Base by U.S. Geological Survey G ENERALIZED GEOLOGIC MAP AND SECTIONS OF THE IDAHO SPRINGS DISTRICT, COLORADO <br />2000 0 2000 4000 6000 8000 10,000 FEET <br />CONTOUR INTERVAL 500 FEET <br />DATUM IS MEAN SEA LEVEL <br />783 -337 O - 65 (In pocket) I <br />