TO ACCOMPANY BULLET IN No. 22 ··cEOLOGY OF THE BUTTE FALLS QUADRANCLE .. Base by United Statt s Fcrest Service Umpqua Na tional Forest Map- 1939 RECONNAISSANCE GEOLOGIC MAP OF THE BUTTE FALLS QUADRANGLE OREGON Datum mean sea leve l 1941 ISSUED BY THE STATE OF OREGON DEPARTMENT OF GEOLOGY AND \.11NERAL INDUST RI ES EARL K N IXON, D IRECTOR ' \ T. 30 S. T.3 1 5 . >D Tba I Geology by W. D. Wilkinson. John Eliot Ail en, Wayne Lowe ll , Wallace Lowr y, Mu rl H utc hinson, Her be rt Ha rper, R ober t Littleton, Richard Mee<l e, Stewart jones. T. 32 S. T.33 S. T. 34 S. T. 3 5 S. "' "" ... <> . .. " "' i:' " !i; &.. "' il " -<: ., PLATE I EX PLANA TI ON Alluvium (Stratified grau l, sand, riU and pumtu) UNCONFORMITY In t rusive (Diorit e sill.s and ba!falt di kr.:r) UNCON FORMITY Later basalt flow (Liuht gra v tntracan11on oHrine bualt ftou:s) UN CON FORM ITY Basalt flows (Light grar; Abbot BuUt: basalt /f01D8) Basalt flows (Gray Ol 11nt Pr ak ba$all flows ) UNCONFORM ITY (t) [!_0] Rhyolite ( White lo buff flows. tuffs u11d brrr:ctas) B Older basalt flows (Black . roarsr tr rtur ed UNCON FORMITY (1) Agglomerate (Grun tu.ff!J and flow breccia..s ) UNCON FORMITY (f) Umpq ua formation (Buff &andstonto!l, shaln and conglamna tt'!l) UNCONFORM ITY massn, dikt's and rl! latnt. nx :k) UNCONFORM ITY Dothan fo rmation ( l-I ard sandJltont':J, shal u and rnnglomnat t s) UNCON FO RMITY (r) I ;i I Galice formation (Sli(JhLlJ 11Utat)Wrfhosed shale&, some san ston,s an conolomeratt.t) UNCONFORM ITY 0 Greenstones (Sltghllu m ... basalts , oaP>brn.s and rt att>d rock.t} UN('ONFORM ITY May Cree k formation (Mica .Jchi3t.s and slatol >- "' c z "' "' ..... c :::> 0 >- "' c ;:: "' "' ..... u ;;; VI c "' :::> -. z :!: z 0 > "' Q U, "pthro111 0 Fault D, dotcmthrotO Strike and dip of sedimentary beda a1 .... Strike and dip of schiatoaity or foliation .... Strike of schistoaity or foliation .... Strike and dip·of joint planes ' Direction of dip of bed X Mine Prospect