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] CONSOUDATEV ROCKS <br /> <br /> l <br /> Lower Miocene sad Oligoccne <br />~J Oligoc~nz and Eocene <br /> <br /> DF. SCILIPTION OF MAP UNITS <br /> <br /> LANDSLIDI~ DEPOSITS <br /> YOUNGER ALLUVIUM - Gt~g~Js ~nd, and silt; max~u~ <br /> tan~s fto~ a few feet alo~ smaller $~re~ms to marc than 50 [oct (15 <br /> meters) along t~e Santiam River ~ystem, Yields m~cmt= to large ~u~n- <br /> <br /> Wi]]am~tt~ River <br /> <br /> ~awL Thickness- re~ges from a~out 30 ~0 300 gc~t (9 ~o 90*m), <br /> <br />TERRA~ D~O$IT$ - C~y, sB~, ~avel, ~nd, ~o~om~rat~, and <br /> stone_ include La.mb ~nd Leffi~ ~avtls o~ Alison, T~c~ess locally <br /> as much ~s 140 fee: (4~ ~), Gcn~r~ly un~turat~d, but lately yield <br /> sm~l qu~tifi~ of water ~0 <br /> SARDINE FORMATION - Andesitic and ba~ltic flow~, volc~nIc mud- <br /> flow br~c~h~ and welded pumice tuff_ Thickne~ in ar~ a~ much <br /> several handed f=~t, Yields smell to m~mt~ qu~tltle~ of water to <br /> <br /> INTRUSIVE ROCK~ den~ ba~ltic and and~itlc intrusives. Not <br /> M~tly <br /> known to y~ld water to wells. Width of some exposures exag~rated <br /> aBOW ill~tration at m~p scale <br /> COLU~IA RIVER BASALT G~OOP - $~n~rally ~n~, dark~y basal- <br /> ti~ ~va in flows I0 to 100 f~ (a to aO m~s) t~l~k. ~hi~k~ <br /> from 1~ than I to mo~e than $00 f~t (1~0 m~t¢~). P~rm~abl¢ <br /> zon~ b~tw~¢a flows yield small to large quantifie$ of water t0 w~ll~, <br /> tuffaceou~ <br /> ~it~ton~, contaln~& [en~s of pebbl~ coflglometat~ in no~her~ pa~t of <br /> a:ea and v~can~ breccia and flows in ~he ~uthe~ ~ar~, Overlies and <br /> /nt~ff~ge~ with marine ~dimenta~ rocks. Ge~erall~ yields w~t~r to <br /> wdh in quantities adequate for domesti~ <br /> MARIN~ ~DIMENTARY ROCKS -- ~ffa¢~ous ~ndstone, ~lltitone, <br /> shale, sad small quantltlea of ~nule and pebble co~lomerete_ Upper <br /> ~art of ~nit intcrfingc~ ~ith ~ttl~ Butt~ Volcanic $~ries. Gener~l~ <br /> y/eld small qu~tifies of water to we~, Wate~ from deep wells may be <br /> <br />I~O----WATI~R-TABLE CONTOUR - Shows altitude of regional water table, <br /> January to February 1967. Contour Intervals I0 and 5:0 feet ($ and I$ <br /> mcta~s); dashed whcre inferred, Datum ~ mean sea level <br /> <br /> Strik~ and dip of b~ds or flows <br /> <br /> WgLL - Lo~aiion number shown <br /> <br /> *d~ SPRING - Location number shown <br /> <br />14s875°°(iD STREAM - GAGING STATION - Station numbcr shown <br /> ~ Number of irrigation weUs in thc $¢ction aa of 1967 <br /> <br /> <br />