Table Of Content

Columbia River Basalt 87 SERIES QPCVP SUB¬ FORMATION MEMBER K-Ar AGE MAGNETIC GROUP (m.y) POLARITY lower monumental member 6 N L EROSONAL UNCONFORMITY cc ICE harbor member 8.5 uj Basalt ol Goose island N CL Basalt ol Martlndale R a Basalt ol Basin City N D EROSONAL UNCONFORMrTY CL BUFORD MEMBER R 3 ELEPHANT MOUNTAIN MEMBER 10.5 R. T O CC EROSONAL UNCONFORMrTY CL o D CO POMONA MEMBER R O 3 CC CO EROSONAL UNCONFORMrTY C3 ESOUATZEL MEMBER \ N EROSONAL UNCONFORMrTY WEISSENFELS RIDGE MEMBER MOUNTAINS Basalt ol Slippery Creek N Basalt ol Tenmlle Creek N Basalt ol Lewiston Orchards N Basalt ol Cloverland N DD An uCn AL 1 1T < ASOTIN MEMBER 13 N CO < Basalt ol Huntzlnger < CO ID UJ 03 < LOCAL EROSONAL UNCONFORMrTY Z J CO LU a WILBUH CREEK MEMBER o a Basalt ol Lapwal N o s Basalt ol Wahluke N UMATILLA MEMBER Basalt ot Slllusl N Basalt ol Umatilla N DC UJ LOCAL EROSONAL UNCONFORMrTY > E PRIEST RAPIDS MEMBER Basalt ol Lo»o ^— 14.5 R < Basalt ol Rosalia . _/ •&? R s ROZA MEMBER T, R E < WANAPUM FRENCHMAN SPRINGS MEMBER > Basalt ol Lyons Ferry N Basalt ol Sentinel Gap 15.3 N < Basalt ol Sand Hollow N BASALT Basalt ol Sliver Falls N, E CO Basalt ol Ginkgo 15.5 E S Basalt ot Palouse Falls E =3 _J ECKLER MOUNTAIN MEMBER O Basalt ol Shumaker Creek N o Basalt ol Dodge N Basalt ol Robinette Mountain N n2 GRANDE FDNDE / See Mangan and others, 1986; \ R 2o DC UJ 1 Reidel. 1983 lor Individual llowsy GCFCE 5 Ni o BASALT BASALT R i *“30U OTA IMNAHA tRi BASALT (See Hooper and others, 1984) 16.5-17.0 No R0 Figure 2. Stratigraphy of the Columbia River Basalt Group. Modified from Swanson and others (1979) by Reidel and Fecht (1987). Natural remanent magnetization indicated by: N=normal, R=reversed, T=transitional, and E=excursional. % /? e 4t / 5 p. fte.c}\ Tj /{. ft. i f fit - 7^ < /Jv/sT2- 1 jf/ou/ e v tdevc £ 6{ Uj e Co/i{>vJ?/^ Ihuer BzsWZ perr*ji€*£7Tc. pi,^Tsoaa. (j~ £q /. So C - c"/'- ^ ^ ^ ts T®-»---Tl- ( Columbia River Basalt 87 SERIES GROUP GSFUOBU-P FORMATION MEMBER K-(Amr .Ay)G E MPOALGANREITTIYC lower monumental member 6 N FROSONAL UNCONFORMITY i.X. ;......i.- e ICE HARBOR MEMBER 8.5 UJ Basalt ot Goose island N 0. Basalt ot Martlndale R a Basalt ol Basin City N D EROSONAL UNCONFORMITY R CL BUFORD MEMBER 3 o Elfe»HANT MOUNTAIN MEMBER 10.5 R. T CL O EROSONAL UNCONFORMITY C2L f3fi POMONA MEMBER 1 2 R o CL CO EROSONAL UNCONFORMITY O ESOUATZEL MEMBER -J N SADDLE EROSONAL UNCONFORMITY WEtSSENFELS RIDGE MEMBER MOUNTAINS Basalt ol Slippery Creek N Basalt ot Tenmlle Creek N Basalt ol Lewiston Orchards N H Basalt ol Cloverland N J< F-1- DngnL 1 ASOTIN MEMBER 13 N < Basalt ol Huntzlnger CO < CO UzJ Li U CD <ffi LOCAL EROSONAL UNCONFORMITY UJ o WILBUH CREEK MEMBER o Q Basalt ol Lapwal N o Basalt ol Wahluka N s i UMATILLA MEMBER Basalt ol Slliusl N Basalt ol Umatilla N CL UJ LOCAL EROSONAL UNCONFORMITY > PREST RAPIDS MEMBER E Basalt ol Lolo — 14.5 (C < 'iasalt ol Rosalia -sSlO 1 tC 2 ROZA MEMBER T, R *< WANAPUM FRENCBHaMsaAlNt SoPl RILNyGonSs MFEeMrrByE R N > Basalt ol Sentinel Gap 15.3 N < BASALT BBaassaalltt ooll SSainlvde r HFolallolws NN. E CD Basalt ol Ginkgo 15.5 E s Basalt ol Palouse Falls E 3 -i eckler mountain member O Basalt ol Shumaker Creek N o Basalt ol Dodge N Basalt ol Robinette Mountain N n2 GRANDE FCND6 R2 CL PICTURE ) 15.6-16.5 UJ 1 Reidel, 1983 lor Individual Hows GCFCE N1 5 y h -J BASALT A** <m BASALT R 1 ^*“3UU OTA IMNAHA f’ (See Hooper and others. 1984) 16.5-17.0 N0 BASALT Ro Figure 2. Stratigraphy of the Columbia River Basalt Group. Modified from Swanson and others (1979) by Reidel and Fecht (1987). Natural remanent magnetization indicated by: N=normal, R=reversed, T=transitional, and E=excursional. cf ft aft/ 5 p. titvA pad) Tf J{ ft. ) ffc . J7) <_ /^cv- yT/0u/ - <? v Ut/vS e Ch C ('c/nrnJ?/^ JIclSk.(Z ***>(, r? p^Trag eyerie ^ phts^T/OAA. (j- eo I S'* c. Cw s J W/. 7 % & £ Zf ~ & » | Columbia River Basalt 87 SUB¬ K-Ar AGE MAGNETIC SERIES GROUP GROUP FORMATION MEMBER (m.y) POLARITY LOWER MONUMENTAL MEMBER 6 N EROSONAL UNCONFORMITY R ICE HARBOR MEMBER 8 5 E Basail oi Goose island N P Basal) ol Martlndale R P Basail of Basin City N JmJ EROSONAL UNCONFORMITY BUFORD MEMBER R CL =o> EliPHANT MOUNTAIN MEMBER 10.5 R. T cc o EROSONAL UNCONFORMITY CL m 5 3 POMONA MEMBER i£ R o cc Cfl EROSONAL UNCONFORMITY o ESOUATZEL MEMBER N SADDLE EROSONAL UNCONFORMITY WEtSSENFELS RIDGE MEMBER MOUNTAINS Basalt ol Slippery Creek N Basail ot Tenmlle Creek N Basalt ol Lewiston Orchards N t- Basalt ot Cloverland N l< H-1 DAOnL1 ASOTIN MEMBER 13 N cn < Basalt ol Huntzlnger < (0 UzIooIJI UlQ9 J CD <CD WLOILC8AULBBH E aaRCssaaORllSttE OEooNKll A MWLLE aaMUphwNBiuaCEklRO e NFORMITY NN 2 s UMATILLA MEMBER Basalt ol Slllusl N Basalt ol Umatilla N C UJ LOCAL EROSONAL UNCONFORMITY > E PRIESTB aRsaAltP IDolS MLoEloM BER — 14.5 ac <5 ROZA BaMsaEltM BolE RR osalia 1 Tre , R CJ.**K ¥ < WANAPUM FRENCHMAN SPRINGS MEMBER > Basail ol Lyons Ferry N Basalt ol Sentinel Gap 15.3 N < Basalt ol Sand Hollow N BASALT Basalt of Sliver Falls N, E S Basalt ol Ginkgo 15.5 E s Basalt ol Palouse Falls E 3 -1 ECKLER MOUNTAIN MEMBER o Basalt ol Shumaker Creek N o Basalt ol Dodge N Basalt ol Robinette Mountain N n2 GRANDE FCND6 R2 <r PICTURE J 15.6-16.5 UJ 1 Reidel, 1983 lor Individual Hows $ OCRS N1 Q y <^- -J BASALT A\*t<zj n R 1 BASALT *SJU> <7T A IMNAHA tRi (See Hooper and others, 1984) 16.5-17.0 N0 BASALT R0 Figure 2. Stratigraphy of the Columbia River Basalt Group. Modified from Swanson and others (1979) by Reidel and Fecht (1987). Natural remanent magnetization indicated by: N=normal, R=reversed, T=transitional, and E=excursional. cf ft euf't / 5 p. u'W pncftTf /< ft- ) ' P) < //v/sTt* ipc/~ L ■ e yUt/^c e 6{ £vrj-*te t Co/ i7t r facs^tx ^ $ p^Tr &p. <?a' £77c ) pi i Crsi.TfOAAs. (- e0 So c. /hn - ^^ & ' 6 £ 4 ~ 6 ?? J.