Preliminary Geologic Map of the Townsend 30' X 60' Quadrangle

Home , Big Snowy Group, Ellis Group, Logan Formation

U.S. DEPARTMENT OF THE INTERIOR Open-File Report 2006-1138 U.S. GEOLOGICAL SURVEY Version 1.0

Kal Kal Kal KmoKevm LIST OF MAP UNITS CORRELATION OF MAP UNITS Kmo Qa Qc 45 Kbqm Qa Ki Kgd QTg QTgQoa Qa 40 Qa 20 Qa Kmo Kevl Kgd Kgd !@s 24 !@s QTp QTp !@s !@s Qp 23 38 Kal Qt Kevm Ki 27 Qa QTp QTp Qa Ygl 65 50 10 Qa Kqm25 QgtQtYgl !@f Qa Water Ygm Qc Qt @r Kevm Ki Qa Qc QTg 20 !@s QTp Qa QTp Kqm KalKbqm KiQa Qa QTg !@s !@s QTp Qoa QTp Qp Qp Qa 21 QgtQa Yg Qa Qa Keva Qa Qa Qc 20 Yg Qa Alluvium (Holocene) Maudlow Formation (Upper Cretaceous) Km Mafic igneous rocks, undivided (Late Cretaceous) Qa Qa Kbqm 28 Qa KgdKi !@s QTp !@sQt Qc 65 Yn 55Kqm 23 Qt Qt 35 !@f Units of Sedimentary and Volcanic Origin Units of Igneous Intrusive Origin Kbqm QTg Qa !@s Qp Qc 23 Qa dt Kgd Kgd QTg Qac Qoa Qa Qc !@f Kbqm Keva Kevl KevlKevl Qa QTg !@s!@s Qp Qp Kqm Ynl Qgt Qgt Ygm Kal Qa Qac Kgd KgdKgd KiKevl QTa !@s QTp Qa Qoa Qa Qc Ynl Qa Water Kal Qgt Qt Kevm Qc Qa QTg Yn 10 Ynl Qgt Water Qc Colluvium (Holocene) Kmh Maudlow Formation, unit h Qgt Kevu Ki Ki Qc 30 Kqd Qa Kl Lamprophyre (Late Cretaceous) Kevm Kevm Ki !@s 80 20 30 Ynl 30 Ki Kbqm Qgt Kevl Qp Qa Ql 40 Kevm Kg Ygl 75 Ygl Ygm Qa Qc Qac af dt ?? Qt 50 Qa Kqm Km Ks QTg 38Qac Ynu Ql Qa 30 Qa Tl 15 55 33 Ygm Qt Qa Kbqm Kgd Kevl Ks QTg 46 Holocene Kal dt @r Qgt Kqm Qoa QTg !@s Qp Qc 10 30 Qbg Qgt16 !@f Qbg Kevm Kgd Ki Qoa !@sc Ql 5 Ql Kqm Qac Alluvium and colluvium, undivided (Holocene) Kmg Maudlow Formation, unit g Jm Morrison Formation (Jurassic) ? Qp Qpw Kbqm Qa #ql Qa Kal Km 15 Kevl Kqm Qgt Qa Qa 5 Ql Qp 60 45 Kbqm Qgt Qgty Qgty Kevl Ks QTg Qac !@s Qa Kgd Ql 20 Qoa Keva10 Qp 40 Qgt Kgd 45 80 37 27 Qgty Kbqm Kevl Kc Kgd Qp ? Qag QUATERNARY Kevm Kevu 15 QTa Ks 10 Qac Qbg Qp Kqm af Qog Qgt Kal Kal Kgd Kevl QTa Ki !@s 25 Qoa af Artificial fill (Holocene) Kmf Maudlow Formation, unit f Jme Morrison Formation and Ellis Group, undivided (Jurassic) Qgtc Pleistocene Qt Qa Qa Qa Kgd Ki QTg QTg Qp Qc Qp Water ? Kqm Ki Qog 35 Qoa Qa Qgto Kal Qgty Keva Qgty !@s Qp 40 Tl ? Kbqm Kbqm QaKevl Ki Ks Kc QTg Qp Qbg Qa Kal Kbqmf Qa #ql Ki Ks Kqm Qgt Qoa 30 QTa Qt Kbqmf Kbqm Kal Kevu Kevl Qa 30 Water 45 Kal Kbqmf Qgty Kevm Ks Qc Kc Yn QTp2 20 20 Qoa Kal Kbqmf Kal Kevm 60 4 Kevl KqmKevl !@s 20 Kqm Qoa dt Dredge tailings (Holocene) Kbqm Kal Qgty Qa Ki Ks Qac Kme Maudlow Formation, unit e Je Ellis Group, undivided (Jurassic) ? QTp QTp QTg Kbqm Qc Kqm KsQTa Qgty Qa Qp 1 Kal Qgt @r Qa Keva Qc Ks Qp !@s Qp 80 QgtyQcWater Kqm !@f QTp2 Kal Kal #ql #ql Qgty KalKeva Kevm Qgt Ks Ki Tl 24 Kal KevmKeva Kbqm QTa !@s Ynu Qa Kal Kal #ql KbqmKevm Ks Ks Kc QTp1 30 Kqm Qoa Kal @r Qgty QTa Ks 30 15 Qoa QTg Qc 35 Kqm Water 45 ? Qt Kal Kal @r Kbqm Kevu Keva 15 Ks Ki QaKs KevlQa Qa Yn 45 Kal Keva Qc KiKs 19 Kevl 15 QgtyKqm QoaYgl Ql Landslide deposit (Holocene and Pleistocene) Kmd Maudlow Formation, unit d Pp Phosphoria Group (Permian) Qt Kal Kal Qgty Keva Ki KevmKeva Kevm Qc Ks Ks QaKevl QTp1 Tl Qgty 45 Qt Qa 10 Ks Qc Ki Qa Kevl Qa Kqm Ynu Qoa 45 50 Unconformity Pliocene Ql Kal Qc Kal Kevu Ki Qgty KevmKevm KqmKevlKi Qa Kqm Kevl Water Qgty Kqd Ygm QaWater 80 Ki Ks Kevl Ks Yn Kgd Yn 25 @r Kal QgtyKbqm Kevu Keva QTa Ks Qa Kqm !@sc Tl Qgty Water Kqm af @r Kal Kal Kal Ki Ki Kevl Ki Ks Ki Qp Kal 20 Kevu Ki 15 Qa Ki Qa Qc 2 !@s QTp2 Water Qp Water Ygm Qp Kevu 12 Ki Ki Ki Kqm Ql 15 Qgty Ynu Qt Terrace gravel (Holocene and Pleistocene) Kmc Maudlow Formation, unit c P*pq Phosphoria Group (Permian) and Quadrant Formation (Pennsylvanian), undivided Keva Kevl Kg QTg Qoa 45 Qt Kal Kevu Ki Ki Ks Water Qp ~!s Kal Kevm Ki Keva Qt Ki Kevl 33Kqm Qoa Kal Kal Qa Keva 10 Qbg Qa Qbg Qp Kal Kal Qt Kal Kevm 10 Kevm Kevm 10 Qa Qc Qbg 20 25Water Kqm Kqm Kal @r Kevm 40 15 QTa Qa Kqm Qgty 34 Qa Qgty Kevu KiKevm10 Qa Qa Kevl Ks 10 Qbg 30 TlYn Yn Qgty 20 12 ? ? Qt Qt @rQa @r Keva 16 Qa Qoa Water Water 37 Qp Pediment gravel (Holocene? and Pleistocene) Kmb Maudlow Formation, unit b *q Quadrant Formation (Pennsylvanian) Miocene Qa @r @b Qgty Ki Kevu Ki Keva Kevm Kevl 20 47 Qoa QTb Qa @r Kevu Keva 4 Qa 45 35 Qc Qgty 30 Qoa ? Kbqm Kal 35 Kevu Ki Kevm Ki Qa 10 Kal Ki Ki Qgty Qc Ks Yn Qc Qoa Qt Kbqm Kbqm Qc @r Kevu Keva 40 10 Unconformity !@s2 TERTIARY @r @r Kevu 10 Ki Kevl Qc Ks Qoa 40 Ki Kevl Qoa 35 dt Qc Keva Kevu Kgd 15 Kevl Ki Kevl 10 Qc 40 !@f !@s Kal @r@r Kal 10Kevu Ki Qc 10 48 Ygu Qbg Boulder gravel (Holocene or Pleistocene) Kma Maudlow Formation, unit a *a Amsden Formation (Pennsylvanian) @s3 @b Kevu Ki Keva Keva Qgty Qa Kevl Ks Ks20 Qgty Qgt !@sc !@ts Qa Kevm Kevl Ql Qgt Kal @r Ki 25 Kevm Kqm Ks Qbg !@s1 @s2 @r @r Qgty 9 Ki Kcu Ks 15 @b Oligocene Qgt Kal Kal Kevm Ki Ki 22 Ks 15 Kqm 45 Keva Ki Qgty Keva Kevm Ki 38 Qc Qac Qbg Qc Ynl Ql 30 Qt Kevm Ki Ks Ks QTp2 15 Qgt Qpw Pediment gravel with windblown silt and sand (Holocene? and Pleistocene) Kev Elkhorn Mountains Volcanics, undivided (Upper Cretaceous) *Mab Amsden Formation (Pennsylvanian) and Big Snowy Group (Upper Mississippian), undivided @s1 Kal Kbqmm Keva Ki Kevu Kevm 6 15 Ks Ks Ki Ks Qbg 25 45 Yn Qa Kbqmm Qa Ki Kevm Keva Ki Kqm Kevl Kcu af Unconformity Qa Kal Kevm Kevu 20 Ks !@s Tl Ygl 37 26 Kbqm Kevu Ki Keva 12 Kcu Qgt Kqm35 QtQa Kbqmm Keva Kevu Qgty Ki Water QTp2 Kqm Qa ? ? Qt Qa Keva Ki 25 Kevm 60 Ynl 52 Unconformity KbqmKbqm Kbqmm Kevm KiKi Kevm Keva Qgty 80 Ks Ks Qc 28Kqm Qgt Ygu Kbqm Qgt Kevu Keva 15 7 Ks Ki 28 30 Qoa Old alluvium (Holocene or Pleistocene) Kevu Upper member Mb Big Snowy Group, undivided (Upper Mississippian) 15 Keva Kl KevmKevm Kevm Ki Kqm KadQt Kal KevaKeva Kevm Qgty Keva Qa Yn Ynu #ql Qa Kevu Kevm KevaQgty Ki 10 QTa Qc 45 Tl Qa KiKevm Qgty Keva KevuKevu Kevl Qp Kqm Qgty Qgty Kevm Qgty Ks Kcu Qp Eocene Kevl Ki Keva Ki KevuKeva Ki Kqm KiKi Kevm Qgty Kevm Ki Ks 40 Kqm Western part Southeastern part ? Qa Qgty KiKevm Keva KevaKiKevm Kcm 40 Kqm Ygm Ki Kev Kevm Kcu 20 33 26 Qog Old gravel (Holocene or Pleistocene) Kevm Middle member Mmu Mission Canyon and Lodgepole Limestones, undivided (Upper and Lower Mississippian) Kevl Kevu Kevm 17 Kevl Ki Ks 15 Kqm Kqm 35 of quadrangle of quadrangle Unconformity Qgt Kevl Kevm 25 Keva Kqm Kevl KsKi Kcu Qa Qa 25 40 Qgt Ki Ki Qgty Qgty Kevm Ki 55 43 Ki 25 Keva Ki Ki Kevl Ki Kc Ki af 13 17 Ki 10 Ki Ki Kevl Ki Water Qc 5 Kevl KevaKeva Kevm20 Kev Kevl Ki Water 10 Qbg 45 Keva Kevl Kevl Qa Ks Qa Kcm 15 Qgt Ki Keva Kevm Qgty Qgty 19 Ki 13 Qag Alluvium and glacial till, undivided (Holocene? and Pleistocene) Keva Ashflow tuff (present in Kevm and locally in Kevl) Mm Mission Canyon Limestone (Upper and Lower Mississippian) Kal Qa Qa Qag Kevm Ki Qc Kevl Qa Ys Kal Qgt Ki KevaKeva Keva Kqm Qc KsKi Kcm 20 Qag Qgt 23 36 7 Kbqmf 25 Kevm Kevm Kevl Kevl QTp1 Qag 25 15 Kqm Kevm Qgtc Ki QaKi 40 65 Kmh Ki Kevl Qgtc Ki QaQTa QTa QTa Ygl 45 Kevl Qgty Keva Keva Ki Ki Qgtc Kevm Qa af Ynu Qc Kg Qgt Kevm KevlKevl Kevl Kcu Kcm Qag Ynl45 Ygu Qgt Glacial till, undifferentiated (Pleistocene) Kevl Lower member Ml Lodgepole Limestone (Lower Mississippian) Kqm Kmo Keva 20 20 Kqm Kmg Kal Kbqm QgtyKevm Ki KiKiKeva Kqm Kbqm Qa Kevl Qgtc Ki Kcl Kwqm Qgt Kevl Kevl Qa Qp 55 25 Kqm KqmKqm KiKevl Ki QTa 25 !@f Kevu Kmf Kevm Qgt Kgd 90 Ki 18 47 Kgd Ki Kgd Kqm Qc Water Ynu50 Qag Keva Ki Keva KsKi af Qt Kbqmm Qgty 10 25 Kevl af Qgtc Older glacial till and associated colluvium (Pleistocene) Ks Slim Sam Formation (Upper Cretaceous) MDt Three Forks Formation (Lower Mississippian and Upper Devonian) Kqd Ksd Ki !@s Qc 25 12 Qa Kqm KsKcu !@s 20 68 Keva Kme Ki Jme Qp 10 QTp1 Qc 20 65 Ygu 1790 13 Qgtc Kk Water 55 Kevm Qgty Kcm Qa Kev 38 !@s Ynu70 QTg 5 Kb Kd Km Qa 15 Ki QTa 50 Qgty Glacial till, younger till where more than one age of till is recognized (Pleistocene) Ke Eagle Sandstone (Upper Cretaceous) Du Upper and Middle Devonian rocks, undivided Keva Ki Kad Kl Qa Qa 35 QTaQa Kqm Kmd Kbqm Kal Ki Ki 27 Ys Ygu Qa 51 25 Kgd Jme Ynu 15 QTg Upper Kbqm Kqm QTg Kcl 35 15 23 13 Qa Qa 3729 Ki Qgtc Qoa !@s Kqm 10 Kmc Kbqm 405213 Kcu Kk Kevl Kcm Ygu !@f Kevl Cretaceous KiKi Ki Kcm Qp Qp 70 Ynu 83 75 75 Qgt Kk Kk Qp QTp1 15 Qgto Glacial till, older till where more than one age of till is recognized (Pleistocene) Qa Ki Ki QTg 15 Qa !@f Qa Ktc Telegraph Creek Formation (Upper Cretaceous) Dj Jefferson Formation (Upper Devonian) Kmb Kal Qa 22 Kevl Kad Ki Ks Kk Kcm !@s 17 Kal Qgt Qa Kcm Kcm !@s 15 50 50 !@f Water Qgt Qgtc 25 Kcu 29 Kcl Qt !@sQp Kqm Qa Qp Ksd Kcu KiKk 27Kcm Qt Qa QTp1 Qc 28 Qp !@f Water 32 Ki 10 35 Ygl Kma Qgt Qgt 32 Qa Qa Kcu Kk Kcm Qt Qp Qa 20 15 Ki Kad KiKi 25 Kcl QTa 15 !@fYgm QTa Older alluvium (Pleistocene or Pliocene) Kc Colorado Group sedimentary rocks, undivided (Upper and Lower Cretaceous) Qgt Qgty Kqm Ksd QTg Kcl Kk Qa QTp1 32 D_m Maywood Formation (Upper and Middle Devonian), locally includes some Cambrian rocks Ks CRETACEOUS Ki Ks Ks Ki Qa Ki Kd 50 Qt 20 !@f Yg !@f Qgty 27 KadKs Ki QgtcKi Kevl Kk Kcm Kk Qoa Ygl Unconformity Keva 14 17 Ki 23 Kd Qa !@s Qp Ynl Qt Qt Intrusive contacts Kad Qgtc KevlKi KiKk Qt Kevl 758548 Ks Ki Ki Ki Kqm KiKevl *q 3 Ygm !@f Kad Ki Ksd 50 Kcm Kcl 10 !@s Qp Ys Ki Kevl Qa Ks Qgtc Ksd Kk Kd Ygu !@f af Kcu Kcu Qt Qp QTp1 30 Qa QTg Older gravel (Pleistocene or Pliocene) Kcu Upper part (Upper and Lower Cretaceous) _pp Pilgrim Formation (Upper Cambrian) and Park Shale (Upper and Middle Cambrian), undivided 5483 Qa Kevl 20 Ki KkJme Qoa Water Kad Kad KadQt Kgd Kevl Ki Kk *a*a Qt Qt Qt Qp 25 Ys Ke 5382 Kcu Ki Kcl Je Qt Qa Qt 25 !@s Qgt 12 @r Kad Kcm Kad Ki Ki Jme*qPp Pp Mm Qa 65 20 Qt Kad Qt Ki Kevl 35 Je QTp1 35 60 !@f Ki Kad Qgto Kevl Jme Qoa QtQt Qt Qt !@s Qt 35 25 Kcu Kcm Ki Ksd *q Pp*q Qa Qt 60 Ynu 60 Qp Ktc Kal Keva Kad Qgto QtKad Ki Pp Qt QtQoa 25 Qa 23 QTp Ys QTp Older pediment gravel, undivided (Pleistocene and Pliocene) Kcm Middle part (Lower Cretaceous) _pi Pilgrim Formation (Upper Cambrian) 17 Qac Kevl Kevl Ks Kk Dj_pi_p 10 !@s 10 Ys !@f 8564 Qt Kcm22 Qt Qa *Mab Qa Qt 18 Kevl Qgto *q _m_w 10 70 35 17 15 Kad Kqd KcuKad P*pq*q Mm Kgd 59 Qa 7 23Qt 74 Water Ys Kad Qa Ki _fYe 25 Ygu !@s 25 Qgt Kevl Kcm Ki Ki Ki *q*Mab QTg Qa Kbqm Ki Kevl Qgty Ki Kad Qt QaQt Ks Ys 9 Qa QaQa Ynu Qt Kcu 22 22 QtQa Qa 12 Ki Water Jme*Mab 54 Qa Qoa 68 QTp1 Older pediment gravel, lower level where two levels of gravel are adjacent Kcl Lower part (Lower Cretaceous) _p Park Shale (Upper and Middle Cambrian) 20 QtQtQa 2010 QaQa Qgto Ki Ksd KiKk Zd Qa Qa !@s 7 Kevm Kevl Qa Kad Ki Kevl 54 Ynl Qp Qp Ys Qa 60 40 Kad Qgt Ki Kcu P*pq*q Ys !@s across the underlying bedrock surface (Pleistocene and Pliocene) Kevm Kcu Qa Qa Ml !@s _f !@s Qog 90 Kc Kcm Kal Ki 24Kcu45 Kcm Kcu Ki KiKevl Ki Ks 46 Qoa Qa 85 20 62 80 Qgt Kad 25 24 Kcu 31Kcm Kevl P*pq MDtDj Qa 30 !@f Kal Kad 17 4225 Qgt Ki Kevl Kcu D_m 53 45 40 27 Kad Kevl KsKad Kcl Qgto Qa 42 P*pq 35 15 60 30 Qog QTp2 Older pediment gravel, higher level where two levels of gravel are adjacent Kk Kootenai Formation (Lower Cretaceous) _m Meagher Limestone (Middle Cambrian) Kal Kevl Qc Ki Kevl _pi_p _f 76 Lower 25 Kad Water KevlQc Kevm Kqm !@s Kcl Mm _m Ys Ys 39 20 65 Ygl across the underlying bedrock surface (Pleistocene and Pliocene) WaterKevl Qgty 12 Kevl Kad Ki Kevm Qa 10 32 Cretaceous Kbqm Kevl Kevl Kcu 28 Ks Ki 32 _w Zd Yg Kevl Qc17 13 QTg#ql Kevl Kevm Qa Ye _m Ygl Qp 85 Qc KevlKevlQc 15 Qgt Kcu _f Yg !@s !@s 50 15 20 Kal Kal Qc QgtQc Kcu Ki Kevm KqmQa KsKcm Kk Kal Kevl Ks Kad 38 Qa Kcm 37 Ki Ksd P*pq MDt 61 Qa 45 72 QTb Basalt (Pleistocene? or Pliocene?) Kal Alaskite and related felsic rocks (Late Cretaceous) _wf Wolsey Formation and Flathead Sandstone, undivided (Middle Cambrian) Kevl Qa #ql 23 Qc Ks Zd 33 Qc Qc Kevl 14 Qgt QcKdKad Qa Ki Ksd Kal Kevm Kcl Qa #ql Ks Kcu 56 Kgd 10 _w _w_f P*pq Qc Kk Water Kad Qt Qt 15 Kcu *Mab _m 40 60 Qa Qc 21 Kcu Ki Ki KevlKevl Kcm 68 QTg Qp Yg 55 KbqmMm JmeQc Qc KkKad Ks KcmKi Ys 20 !@f Jm 15 Qgt Kevl Kcm KkJme Ml 58 Qa Qa 25 37 Ygl KiPp Kc Kevm 18 Qa52 Qgty Ki Ks Ki Ki Kcl Kgd 45 Yg Qp !@s Ys 32 40 !@f ~!s Sedimentary rocks, undivided (Pliocene and Miocene) Kg Granite (Late Cretaceous) _w Wolsey Formation (Middle Cambrian) Ml Kcl 16 20 Kevl MDt Dj _p Zd Jme JURASSIC Ml Kal Jme Kad Qa Jme #ql Qc Ki _m Qgt Kal Kevl Ks Jme Ki Ks D_m_pi 20 60 DjMDt Kevl 22 35 Kcl P*pq Kk Kad QTg Qp Ys Ynu Je MDt 52 22 Kevm Ks _f !@s 30 Kal _pi Ml Kevl Kevl Kevl 17 Kcu Kk Kgd Qc 30 Kevl Kevl 75 Qp D_m 40 Dj Dj Kevl Kad Qa Km QTgKs Kqm 18 _w_f 47 Kal Dj Qgt Kevl Kad Kcm Qa _p Ye QogQog !@s Sedimentary rocks, undivided (Miocene and Oligocene) Kg Kg MDt Kevl Kad Ks Qa Kb P*pq JmeP*pq QTg Km MDtDj _w 20 !@s 38 Kqm Quartz monzonite (Late Cretaceous) _f Flathead Sandstone (Middle Cambrian) dt Kcm Jme Qa 10 KcmQa Qt @b _pi Qp Qa Dj _m Kg Kc Kad Kcu Kk P*pq Kcm Ql Ml D_m Zd !@ts !@s Qa 30 35 Qa Dj 19 Kevl Kcl 40Kk Qa 54 _p QTg 60 52 Qa _f_w Kk 18 Kcm *Mab *Mab*Mab Qog Kgd 25 MDtKgd _f Qog Qog _p Qa_f Ynu Unconformity Kbqm _m 35 Qgty Qgt Jme Qog Qt @b Qa Ki 20 _pi 45 70 Zd _pi Pp Qgt P*pq Kk Kcm Kcl Kcm Ki MDt D_m Ye Zd Qa Qp _w Qa 35 _f Ml Jme Mm Jme Kqm Ki Dj Yg Qoa Qp _m Dj Kevl Qa Kad Kcl Kevl Ki 70 _pi_p !@s2 Sandstone and conglomerate tongue Kbqm Butte quartz monzonite (Late Cretaceous) Zd Diorite (Neoproterozoic) Ys dt MDt *q Kevl Kgd Kcu Ye 63 _m _f 27 !@f Kgd _p 12 21 26 Kgd Kgd P*pq KadKkQa 22 Kcl MDt _pi 66 Zd 20 30 35 Kal Kg *a 12 Pp 50 Qa 10 QTg Kevl Kevl Dj QTg Qa _w 53 QTg KbqmKgd Ys _w Kd 17 14 *q Qa Qa _p Ye Qa Qp !@ts !@s !@sQa Zd 25 QTg 38 Kad Kcu Qa Km Ki Kcm 60 MDt Dj 25Yg 8 !@ts _f QTg Qa KdKd Qgty Ks *Mab Ks 35 Ml _f Zd Qa 20 QTg 45 32 Qa Ys Jme Kad Kk Kcu Kevl Ki *Mab Kgd _pi_m 23 10 !@s Qc !@s Zd 55 Pp PERMIAN Kevl_f _f dt D_m 22 15 Kcu KkJme Ml _f Qa 10 !@s Orange-red conglomerate and sandstone tongue _p Mm Kk Kcu Ql 25 Ki MDt _p !@s 1 Kbqmf Alaskite and related felsic rocks within the Butte quartz monzonite Belt Supergroup (Mesoproterozoic) Ys 49Kd52MDtMl *q Qa P*pq Dj _wYe Zd QTg Qa Qoa Qa 28 12 P*pq _w_w_m _pi 13 25 Kcm _p Ys Qa Qp!@s Ys 50 Ys Kevl Dj PpKad 21 Kcl P*pq Jme Kk 73 15 YsZd 7590 Kevl Kgd_w Mm Kd 18 Ki _pi Ye 64 30YsQTg !@s Qp *q Kgd Qa 18 Kb Kcu Ml _p Zd 35 Kevl *Mab Ki Qc Ks Ki _p 73 Zd 13Yg Qa !@s 30 QaZd Kd Kgd _p MDt Kad 35 13 37 Kcu MDtKgd !@s Ygl 7 Kbqm Qa 19 Kcl Kd Kad @b Ki Mm 5 Ys Qa Qp _f !@f Fort Logan Formation (Miocene and Oligocene) Kbqmm Butte quartz monzonite, medium grained Ye Empire Formation Kd *Mab Kqm MDt _wYe 10 40 43 Kqd _w _pi DjKd 22 *Mab Kcu 27 @b@b 25 _p Zd 52 28 Qoa 30 PENNSYLVANIAN 40 Kd 20 Kb Kad Kcl 10 P*pq Ks !@s _f Ys !@s 20 !@s Qa _pi Ygu 28 10 *a Qa QaKgd Ml 16 P*pq Ql 28 Qoa Qa Qp Qc _w 17 62 Kevl 5550 Kk Kevl KsKs 16 Qa 31 !@ts 25 Dj Qa Zd Ys 33 Kd _w 16 KclKb 10 Kcu @b Qoa Qp Qa 20 _m _f Ys 32 Ys 28 Kevm Kevm _m Ql Jme Kgd Ks MDtKgd Qa !@s _w 37 _w Dj Jme Kad 68 Km Kcu _w D_m_pi _w Ys Ynu !@sc Sedimentary rocks, undivided, covered with discontinuous Kwqm Quartz monzonite of the Wilson Park pluton (Late Cretaceous) Spokane Formation Kd Pp 38 30 Kcu Ye !@s _p _m 45 20 20 Ys *Mab 35 Kd Pp Mm Kcl Dj 17 25 Ml Dj Qa _f QTg 37 Unconformity Qa _p_pi Kgd Kad Jme Kcu QTg D_m _f MDt _p 50 veneer of gravel, loess, sand (Miocene and Oligocene) Jme 15 22 16 Jme Km Kcu 25 @b Ml Qa MDt70 D_m 22 22 Kcu 80MDt _pi 16 !@s !@s Dj _p_w 65 20 Dj Pp Pp *q Kad Kad Kcm Ki _w 14 28 15 Qa 40 _pi 90 40 63 Kad 40 Ml 30 @bKcm _m Ye Qoa _pi _m 75 85 Ynu 60 QTg 20QTg Qa MDt *q Kb 16 22 Kcl Qa _p _f 75 16 5 Dj _pi _pi Qc Ys 45 40 90 70 50 50 20 !@ts Vitric tuff and tuffaceous sedimentary rocks (Miocene and Oligocene) Kad Kk 12 15 Ki Qbg MDt 90 Ye 70 !@s Qoa 25 Dj_pi 35 Qc Kmo Monzonite (Late Cretaceous) Yg Greyson Formation, undivided Mb 65 35 Jme *q Kb 24 Jme 15 P*pq*Mab _w Qac D_m _m QTg 10 13 Kcl @b Kl Ys Zd Qa Yg Qc 15 _pi D_m _p Ys 40 Ygu Pp 45 20 45 _m_f DjDj Ygl 30 QTg 65 8 Kad24 Qbg Jme D_m Qoa Qc Qac 10 25 MDt 35 QTg QTg KbqmKev 36 20 *Mab Qa Ki Kcu @b _p 64 Qa Qp 50 80 50 Ygl 25 Ys Kev *Mab 20Qac MDt 27 Ki MDt 16 23 QpQac _p _w 70 15 Upper 27 30 KcmKcu !@s Qc _m _f 35 _f *a 32 Kad Ki Qoa _m Dj 65 35 Qp @s3 Dunbar Creek Formation (Oligocene) Kgd Granodiorite (Late Cretaceous) Ygu Greyson Formation, upper member Ki *MabMm 15 Kcl Kcl _p_f 45!@s Ys 45 Qa 80 10 Mississippian 48 55 35 50 12 Kk Kcl32 Kcm QTg Qbg 84 74 QTgQog Qa 20 Zd 20 Ys_f 15 Jme Kk Kcl _pi 82 14 10 30 _mKqm 65 35 Ygm 35 _m Unconformity Ki Ki KcuKcm 10 Qc D_m 20 !@s 10 MDt 50 40 25 _w 37 45 Dj Ki Ys Qoa Qa 10 10 Ml Dj Qc 80 _m Ml 30 Kad 37 Kcl Kk Ks @b Mm 12 Yg 30 30 90 Qa 60 Qc MISSISSIPPIAN ~!s *q 26 45 Ki !@s@b _w Ys 20 Ml Zd 70 _pp !@s 25 Kb 14 16 KiKi Kk MlMDt 15 Qa Qa Qpw Qa _pi 25 Qc _p Qc Climbing Arrow Formation (Oligocene and Eocene?) Kqd Quartz diorite (Late Cretaceous) 40*Mab 30 25 22 Dj _m_f 19 10 15 !@s1 Ml 35 35 _w MmMlDu QTg!@s 15 Ygm Greyson Formation, middle member ~!s Kcl Kcl QTp Zd !@s Kqm _pi 15 30 Mm Ml 57 Ki 25 _p Ys !@s 20 Qa 85 _m 15 ~!s Kcl Kcu Kevl KiKs QTg @s2 10 10 _m Qa D_m _f Mm 90 ~!s 29 Kcl D_m_pi YsYs Qac 45 40 50 35 10 QTg Ml Kk Kcm KcuKcu Ks 16 QTg @s1Qac 20 !@s1 Mm MDt 68 40 15 14 Kcm Kk Ys @s3 @s3 !@s 20 20 25 5045 40 40 25 Dj QTg Mmu 24 15 25 13Ys Qoa Qoa Mm MDt 40 Qc !@s @s Upper part (Oligocene) ~!s 40 36 QTp Qac !@s 15 MDt 2 Ksd Syenodiorite (Late Cretaceous) Ygl Greyson Formation, lower member 5 Kad 12 _p Ks 35 Qa 30 Qa @s3 15 _pi 10 Ml Pp 42 Kk 37 !@s Qa Qoa Qa !@s DjMl *Mab _pp Ygm Lower 10 40 Dj 19 30 Kk Kcm QTg 11 Qa Qa 10 10 30 !@s1 Qa 20 20 Qpw 70 _f Kev 40 Kk 20 Ks 20 15 Qa Qpw QcDj *q Jme 40 Qp 55 !@s 30 Kk 7 16 D_m 40 Ys @s2 5 @s2 25 15 Qc Kk _pi _pi Mississippian Pp 14 Ks Ys Ml _p Qc Qc *Mab Jme Kb _w Kcm QTp !@s QTa Qog 30 5 Qc 90 35 60 55 Dj _m_m Ys20 37 *q Kl 12 Ks Ki Qoa 11 @s1 !@s @s3 20 !@s Jme *Mab 40 _m Qc QTg Qoa @s1 Lower part (Oligocene and Eocene?) Ki Andesitic intrusive rocks related to Elkhorn Mountains Volcanics (Late Cretaceous) Yn Newland Formation, undivided MDt *q QTp Mm Kcm Ki Ys QTa 10 Mm 20 Qgt_w _f Kev *q *Mab 12 _m 15 25 Kk*q Qc 55 !@s _m 30 45 *q40 37 15 10 27 QTp Ys Zd 15 *Mab 45 Qc 35 20Qa _w Ks @s3 *q Jme 50 35 Qc Qa _pQgt *q Ml 58 P*pq _f Qa Kcm Kevl 10 KevKev *Mab MDt 25 36 Ks Water Qog @s2 Qpw Qc 60 Qc 30 20 QTg 25 25 40 Ki Kk 10 @s2 5 QTp1 *Mab 35 35 _m Pp Mm 34 MDt 27 _f 20 45 !@s 35 35 10 _pi QTp 40D_m _pi Jme Jme 13 MDt Kk Water Ki @s3 PpQc Kk*q D_m _pi _p @r Rhyolite shallow intrusive bodies and flows (Oligocene) Kad Andesite and diorite intrusive rocks (Late Cretaceous) Ynu Newland Formation, limestone-bearing upper part Unconformity 47 Dj Kcm Kk Ki @s3 30 25 30 40 45 55 45 D_m 45 Jme Pp*q*Mab *q Kad Km Water QTp 20 *q Dj Qa Upper Kal Kev!@s MDt 36 KkKcl Kcm Kk 23 20 @s1 15 Jme Qc QoaQa 10 dt 72 35 Jme Qp !@s 20 Jme 55 Devonian Kev Kal !@s 65 *Mab _p _f_w Km 63 Kk Qoa Ys Ys *Mab 45 Qc MDt Du 45 54 10 53 35 Kk 20 25 Qc _f_w DEVONIAN _m_w P*pq Kcl KevlKevl Qa 25 @s2 25 Qc 90 40 Qa MDt _w 34 Kcl Qoa @s1 @s115 D_m QTp30 MDt @b Basalt (Oligocene) 30 _f _m *aP*pq QTg Kcm Ki Zd @s3 Qc Kk 65 45 10 20 15 Kb Basalt (Late Cretaceous) Ynl Newland Formation, lower part Dj ~!s 35 46 21 KiKcm KiKevl Qog Qa 20 55 Kgd _f 34 Km P*pq Kk Ks QTp Qoa 25 15 Qc Kev 30 _w _w MDt Kcm Kcu Qt QTg 30 @s1 20 !@s1 20 *q 70 40 Kev 32 Mm Ml Ki QTg dt 20 35 Kal _f 58 33 38 KcmKcl Kcm !@s Ys Qc 35 30 _f_w _pi 24 Km Km Kcl Qp Kevl!@s !@s Qa @s1@s2 55 35 Ml Middle 75 60 _pi Kk Kcm Ks @s1 *q @s3 *Mab Zd Disconformities 45 _w 47 45 Ys MDt *Mab 70 Kk Ks Kqm Kqm QaQa Qpw #ql Quartz latite (Eocene) Kd Diorite porphyry (Late Cretaceous) Yl Lahood Formation D_m Devonian ~!s Kev D_m Yg 39 20 Kk Kcm Kcu Ki QTp Qc80 30 10 20*MabKk 75 45 *Mab _f KiMl Jme Kcl Ks Ks Kevl Qc 25 Qpw Kk Zd 40 Ml 60 45 _p_m_w 25 Kd Kk Ki Kcl Ks dt !@s !@s Qa Qoa KqmYs Jme 35 30 20 Ml *q 48 _f _f 45 P*pq Kcu Qp *qJm @s1 QaQc 30 30 20 10 43 70 _f 29 _p Kk Kk Kevl dt !@s Kqm Kqm 80 Kk@s1 5 *q Ql MlMm *q 64 _w Kad Kk Kcm57 30 Kk 15 Jme*q Qc Upper Mm 7 _m Kad *MabJmeJmeKk !@s Qp Qoa Kk40 Jm @s2 30 40 Du *Mab _pi ~!s Ml KiMl _f Kad Kad Kk KkKcuKevl dt 25 Yg Qc 60 50 35 Qc Cambrian *MabMm 68 33 Kad _w !@sQa Jme Qt 25 25 25 30 Qp JmeKkQc 45 40 Kk Tl Lamprophyre (Tertiary?) Contact—Dashed where approximately located; dotted where concealed MlMDt 65 Kad Qa Kk Kcl QTp !@s MDt Kk !@s 25 35 _pp _f _m Kcl Kcu 35 !@s !@s *q 65 65 _m 39Mm MDt *Mab Water Mmu 25 15 50 30 Mm 10 Qa 46 7 _w 25 KcmKi !@s Dj 15 Qc *MabMm 20 Zd _p Pp*q48 _f 26 Kad P*pqJme QTg QTg !@s 35 Qt 15 25 MlMDt _p 60 _w 35 !@sQc Qoa Kqm Mmu 15 Qa 40 45 MDt Qt !@s 25 Dj 40 20P*pq MDtDj_pi_m Kad JmeKkKi 10 30 20 10 60 55 45 45 Fault—Dashed where approximately located; short dashed where inferred; dotted where Dj P*pq 53 58 Kad P*pq !@s QTg Kevl Qp Qoa *q 20 10 Zd 18 *Mab D_m_pi_p Zd Kad Kk Qa Ys 30 Qp _pp Qt 59 Zd Jme Ki Qa Ki Qoa 25 25 Kk QTp1 25 Qa 30 _f 65 Kcl Kcm CAMBRIAN Ki MlMDt _m 15 55 Kk Kevl Yg *Mab 45 45 55 Kcm 15 concealed; queried where uncertain _m QTp 53 P*pq Ks Kqm*Mab25 20Qp Qpw 35 Qc *Mab 112˚00' 111˚45' 111˚30' 111˚15' 111˚00' *q *q 43 _w_f Yg Ys 9 Jme QTg !@sc 9090 25 60 20 20 45 Qc Mm MDt 43Ki Ys 40 *Mab Qa *q 25 40 MDt Qc Kcu 15 Middle Mm*q 75 MDt Yg 58 14 46 MDt Kevl !@sc 25 Jm _p 30 _w 45 45 40 Qc 55 Qt *q 46˚30' Normal fault—Dashed where approximately located; short dashed where inferred; Kad MmMl _p_m 45 _f Kd !@ts JePp Mm Zd Jme 60 QTg Qc 30 80 Dj Ml Ki !@ts !@sc *Mab 25 20 10 Qc 55 55 50 KcmQc QtKcm Cambrian 60 MlMDt _pi _w KadYsYsKad 25 5 _m Qc _f 60 30 35 (6) _w D_m Kk 5 Ml _p Qa Mm 10 Qc Qc Kcm dotted where concealed. Ball and bar on downthrown side Pp*q 13 _f _f 45 P*pq Kcu Kqm 55 !@s 90 QTg Kcu35 QTg 5 60 _f D_m 60 20 *Mab 15 10 Ys *Mab 65 Kcm Qc _wf 35 !@s Zd Kad Jme !@s Qa Qc _m _w 90 Qc Kcu Qoa Kcm _p _f 35 Kad Kcl Ki *Mab65 35 *q *MabQTp1 Ml 15 Qc 65 Qc QTg Kcu Ktc 25 Reverse fault—Dashed where approximately located; short dashed where inferred; 53 _w Mm*Mab 15 !@s _p Kcm Kcu Qc Qoa 25 Qa _m_w 29 40 _p 55 Kqm Kk *q 5 Qa Qa 45 Qc Qc I _f 42 Qa 70 Kk Je 25 Dj !@s 30 _p 50 *q 40 50 Ktc QcQTgQc Qa Kcu Qa 38 _f_f !@s Kk Pp Mm 10 MDtQa _pi 60 *Mab Kcm Kcu Kcu dotted where concealed 45 45 P*pq Kcm Kevl Kk MDtMl 35 _p _pi _p 30 *Mab Kcu _w_f 20 20 30 Qc 35 Qc Kcm 70 65 QTg Kcu 30 Ktc Qa CASEY MOUNT ALKAL MDt Dj 45 _f_w P*pq Kqm Kqm 20 QcQc D_m _p_m _f Qt Ktc CLANCY GURNETT GURNETT Mm _pi Zd Dj Dj _m 80 40 Qa Kcl Qc Ktc Ke Qt 30Qc TOWNSENDNE EDITH LAKE D_m Ml _m _p *Mab Qac Qc Kqm MDt 40 Dj 35 D_m 15 50 Kcm Qc Qc Qoa Ktc PEAK WINSTON Unconformity 55 _p !@s _m D_m QTp Yg Jm D_m _w35 _p 10 Kcu Kcm Kcu Kcu Kma QTg 25 Thrust fault—Dashed where approximately located; short dashed where inferred; dotted 70Mm Ki _pi Qp Jm Ml _piZd _f _p_pi Dj _w 25 Kcu Qc Kcu 30 CREEK WEST CREEK EAST Water !@s Dj 43 Qp Qp Ml Ml _pi 30 Qc Kcu QTg Ktc65 Ke Kmb Jme 62 P*pqJme Kd Qp Kk 40 _m_p Ys Ktc Ktc Ktc75 Qc Kma Qa Qc where concealed. Sawteeth on upper plate *Mab WaterMl MDt 50 Ki 30 Yg 30 15*q Dj Dj30 30 Qa Ql 45 Ktc Ke Ktc 25 51 56 Ml Kevl Kqm Qa Pp _f 20 Kk Mm Ktc KeKmaKe Kma Kmb Ki Mm P*pq Kcu 25 Je 15 10Dj _pi Ys Yg _p Ql Qc 65P*pq 60 Kmb Kmc Qc 35 Ktc _pi Dj Mm _f _p_pi Ks Kqm 60Jm 25 MDt _m Qa_m QcKcuKe Kmb Kmb QTgKmc Qt Kcl Dj Ys 30 42 *Mab !@s !@s 20 Dj 35 _p Yg Qa 60 25 Kcl Kmb 30 _f_w Ki Pp D_m Qa Qa 25 Yg 40 P*pq 50 Kmc Kmc Kmc QTg Qog Kmb (2,7) Strike-slip fault—Arrows show relative direction of displacement; dashed where 16 30 _pi P*pq Qac Kk 20 Qa _w Kcm Qa 20 Kma Kmb UPPER 35 Kk Qac 25 Ml QTp1 Qa 40 50 70 Kmc 35 Qt 20 Zd D_m_p 30 MDt *Mab Kad Je Mm _pi _f Kmd QTg Kmc Kmc 25 _m_p 70 82 Ki22 Ki 30 55 Jm45 *Mab D_m 20 _pi Jme Kmd Qc Qt 30 approximately located; short dashed where inferred; dotted where concealed PROTEROZOIC Dj Yg P*pq Kqm *qPp 10 20 20 Qa 55 25 Qa P*pq QTg Kme Qt Qog Qog Qc Ke Kcm 30 65 _pi D_m Kd Kcm Kevl !@sc Je 20 Qc _m Qc Ys *Mab Kk QogQt Kma Dj 15 43 Kqd Ys Qc Qc Qc _pi _pi _f 80 *Mab 55 Kmb Kme Qa Qc K 16 45 30 Ys Ys P*pq 50 Qc Kmd Kmd Kma Kcu 35 Detachment fault—Dotted where concealed. Teeth on upper plate Qa D_m _m Norcen Energy Resources, Ltd., Norcen Balcron UTP Kimpton Ranch 1-11 *Mab Qa Zd Qa _p30Qc _f _pi *Mab Qa Qc Qc Kmc25 Kmb Qc 40 Kd Qa Kevl Ys Pp _m Qa Ktc 90Kmd Kme Kmf Kmd BATTLE MDt _w P*pq Qa Dj _m Qc 25 Yg 20 D_m 10 Kma Qc 25 Kmd Qt Kmb 30 Qt LIPPERT SULPHUR Intrusive contacts _pi Kad 30 6 45 Kcu Kqm 25 Qpw30 Qc *Mab 20 _f_w 30 _w _m Qt Qt LS HOLKER QTp 72 Ml Kd Kevl Qa 50 15 MDt20 Qc _w Ys Qc 20 Kme Qog Qt KtcKtcQtKtc 25 ELKHORN GIANT HILL TOWNSEND GULCH 15 43 Jme Kd QTp Qac Kqm Yg Qa 20 Qc Ys _f _m Ml 55 KmbKmc Kme Kmd Qt Qog Qc CROW CREE BAR CREEK MOUNTAIN Fault—Inferred from gravity survey _f !@s ZdYs *a 40 Ml Dj 25 _w _fQc 15 30 Mm Qog KcuQc Qa Qog Qog QcQc FAL 20 Kad QTp Qac 70 Dj @s1 25 Dj 30 Jme QcQog QoaQoa Qt Qog Qa Qa Qc MDt46 24 Qc Qpw *Mab Mb 25 Qc _wQc 20 40 _p *MabQa Qc Kmd Qt Kmb QaKcl Kad Kd Ys 80 Qc Qpw 10 _m _w D_m 30 Qog Qt Qt Qt Qog KcuQog Kcu Qa 43 35 Kk !@s 26 Je Dj _f Qc QcP*pqQog 40 Qog Qt Kmc Qa Ktc Qt Qog Qc 35 80 20 Qa 50 Zd Kk *a15 Ml Mm Kcl Qt Qt Kcu 40 (5,7) (6) D_m Ys _f _w Kcl Kcu Kd Qa 20 *Mab 30 Qc Zd @s1 _pi 15 Kcl 55Ktc 80 Qa Qog Qoa Ke Kcu 45 20 Fault—Inferred from aeromagnetic survey Ye P*pq !@sc Zd JmPp *q *q 10 _pi _mMm 30 Qa 35Kk Kmc Qa Kcm 46˚15' Keva Mm _w Kd Kqm Yg QTb 15 Qpw 15 30 *Mab Qc Kme QogQa15 Qt Qt Kcl Kcl QTp 17 24 25 *Mab Kcu Qa *q Ql 15 _f _p 15 55 Ke Qa Qt Kcm Qc D_m Kad Qa !@s!@s Qc Qa 25 _w Qpw 15 Yg _m _p 30 *MabJme Mm Kcm QcQog Qog Qog Qoa 35 Qc Qt Ml _pi 30 Ml Kcl 30 10 20 20 Ktc QtKme Qt Qc Qc Qc Qa 85 _m _p 40 Jme QTp !@sc Kqm 50 *a Qa !@s10 Qpw Qc Ys _f P*pq 40Kk 40 10 Qog45 Qog Qa 20Qt KtcKtc Qt Anticline—Showing trace of axial surface. Dashed where approximately located; Kad 7 50 KqmYg60 Ys 60 P*pq Kmg Ys Ml 70 DjD_m Mm Kcl Qp Qp Kqm 40 *Mab 25Qa Qc _f 10 20 Ys Kmb50 Qoa 25 20 Kcu Qa Kad Qa Ys Qa Qpw _m _w 15 QtQt Qa Kmd _pi32 KdP*pq Kd !@sc 15 15 Qog QTg KmaKtc Qt Qc short dashed where inferred; dotted where concealed; queried where uncertain Kd _w Kd 25 QTp *a 15 5 5 20 P*pq Qog 75 Qog Kmd Qa 25Qc N QTp _f *Mab Kd Jm *q 15 Kmc 30 Kcm OMA Qac 25 22 QTp !@sc Ys Je Mm Qa 20 10 Ys 20 25 45 Kcl Kcl Kme Qc Qt Ygu 65 Ml Dj _pi *a 55 Ks Qp !@scQa !@s 40 20 Kcl Ktc Ktc DEVILS SIXMILE Qa !@s 35 Kad Qa QcPp 10 30 20 Kcm 55 Kmf Kmg 25 15 Qt Kcl 30 Je TAC PARKER FRANCIS 35 Dj Qc 15 Ys Zd 30 1025 P*pq Qa 50 25 Qc 25 PARK FENCE TOSTO DEER PARK Plunging anticline—Showing trace of axial surface. Dashed where approximately located; 2 !@s Kcl Kcm !@s 35 Qc 20 !@s 15 _pi _pi 30 Kcm RADERSBURG _f30 Qt 20 Ys 15 10 15 Qpw 35 Yg 25 D_m Qa Kmc 15 Qc MOUNTAIN Yg Ygm Kevu Dj Kad Kcl Qa Ys 30Ys 10 Dj Kmh Kcu KcmQt MIDDLE Ml _w KdQa QTp Yg Pp _pi Kcm Kmd 20 Qc QTg dotted where concealed Belt 33 29 QTp !@s Yg Qa 5 25 _m Dj Kme QTg Jm Kevu _f KkKcl Je 25Kk 40 _f 10 40 Mm 40 15 Kk Supergroup Kwqm Keva Kcm Kd 30 Ys40 *Mab*q P*pq Qc !@s 20 Dj 15 D_m D_m65 Jme Qa @b Qc Qc Qa (3,7) PROTEROZOIC Kd Dj Ys P*pqJme Qa 50 Je 10 15 Qc MDt30*Mab Kmb 30 25 Overturned anticline—Showing trace of axial surface and direction of dip of limbs. Ygl 40 Keva Ys 50 Kd 20 *Mab20 Qpw 25Qa _f D_m Dj Qc Kk60 35 5 QtQa Je Yg Ml Mm*Mab QTp Kgd QTp 40 Je Qa 10Qa_f_w QcQc Qc Qa Kma Kmf 25Qc Kcu 44 Kad 25 33 Qa !@s _f 30 40 20 QTp Dj Qc Qc 25 Qa 40 42 46 Kgd Qc Pp Qpw D_m Kcu 30 Qc Ktc Dashed where approximately located Qa Mm !@sc Qc Qc Kcu Ke KmcKmc Kme Kmg 25 Qt25 Ynu Qac Kevu Qc Qpw Ml Kk20 Qac Kevu QTp _f Kad 40 45 Qc 15 10 Qpw 25 30Dj Dj Kcl Ktc 35 35 Qc KevaKeva QTp Qp 30!@s Yg 15 Qa 30 Qc Inverted anticline—Beds in both limbs are overfolded and dip toward trace of axial Kd Kad QTg !@s _pi Qc Pp _m 20 45Ml *MabP*pq Kmd QTg Qt Yn Kevu Qa 30 11 30 Qa Qa~!s2 _pi 75 40 Kmf 30 Kevu 15 Qc D_m Kk 20Je _w_m _f_w *Mab Kcl Kcm 55 Kk Ynl Qgto Kevu QTp 46 19 24 QTp 25 *MabQpw *q 15 35 34 Kmd KtcQc surface shown. Dashed where approximately located; dotted where concealed 38 73 !@sc QaMm !@s 40 70 Qpw Ys 10 60 55 P*pq 15 50 Kmf Kmd 25 Kevu _w Yg 10 15 !@s _f D_m Jme Kmd Kme 30 KeQc WILLOW BLACKTAIL Mm 30 QTp Qt Qa Mm 5 @s3 25 2 Qa 20 60 Kme SW PLUNKET Kevu Kd Kevu 42 Qt Kev 40 Qpw 50 Ql 25 35 65 65 _f *Mab QogKmc Kme Kmd SPRINGS RADERSBURG LAKE LOMBARD ROY GULCH MAUDLOW Syncline—Showing trace of axial surface. Dashed where approximately located; 43 Kk Yg 25 _p Dj 60 Mm 5 Qpw Ys 40 !@sQc Qp Kcm 45 Kme Ktc Qc Qc DUNN CREEK MOUNTAIN _p Ys _p 33 P*pq !@sc Kev Qpw Ql 20 Qa *Mab !@s !@s 55 Qa 20 35 P*pqKk Qp Qa Kmd Kmd Kmd Qc Kd _m Ys _f 28 Je QTp !@s Yg QpwYg 50 30 Yn 50 QTp Qc Kcm Yl 40 20 34 _m Kk @s3 Jme Kmc 20 35 Ktc 25 short dashed where inferred; dotted where concealed; queried where uncertain Kevu _f _pi Kevl 15 QtQa 35 _m 30 Qpw 25 Yg 25 !@s KcuQc Kmd QTg Qac Qa Qa 36 D_m Dj Je Mm Ml 17 Qpw Ys _w Mm Kc *q 20 !@s Qa 55 50 Kmd (10) (4,7) (1,7) (8,7) (9,7) Keva Ql _pi D_m 25 50 15 !@s Kcl Qa Kmc MmMl _p _w P*pq _pi _m Ml 45 30 30 70 Kme Qt Qc Kcu 23 QTg 31 Qpw Qpw_w 75 Pp !@s Yg 40 90 50 Qa Ktc KmfKmf Kmc 25 46˚00' KwqmQa 42 _p 28 Kad QTp Kev !@sc Dj Qpw 40 !@s Qc 65 Qc Kcu 40 Ktc Qa 30 Qa Kevu60 MDt Dj 30 Yg Qpw Kk !@s 20 Qpw Yn Kcu 70 QaQa35 Kma Plunging syncline—Showing trace of axial surface. Dashed where approximately located; 57 _m QTp Qt 40 D_mDj 30 25 20 60 Qc Qa Ktc Kcu 35 Kd Jme _wQpw 90 Qpw Kc Qc _p 30 D_m _m Dj40Jme Qa Qac Kmb 20 INDEX SHOWING QUADRANGLES AND MAJOR SOURCES OF GEOLOGIC MAPPING Kevu _pi34 25 11 Qp 70 30 Qpw Kcm Kmc Qac Qa Kcu Kwqm 27 QTp 13 !@sc 30 Je 35 Qc 25Kcm Kcu Qc dotted where concealed _w _f !@sc Ml _pi 18 20 Qc *Mab !@s @s3 QaKcm Qc Qc Kcl [Reference numbers (in parentheses) are listed in order of principal map contributions for the area shown in discrete color] Kevu 40 D_m 15 _f Kk Qa 30 ~!s2 Qc 35Qc P*pq Qc 45 Qc _w _f 30 Qp _m Kc ~!s2 30 30 50 3545 55 MDt Kcu 15 Kcm Qc Qac Kd _p Ys Ml Qa !@s Qpw Yg 10 Ml QpQp 25 Ke Kmb Qp Kmd 30 Qc Overturned syncline—Showing trace of axial surface and direction of dip of limbs. !@sc Qp Yg 30 KmdKme Kmg Kcm Ktc Qc 30 Qgto 70 Ml 60 28 30 QTp _f Ys_f Mm Qc !@s 5 Qa Qa D_m KclKcm 40 Kma 40 Kmg 40 Kevu Mm _p 23 Qp 25 Zd 25 Qc 30 Qa 60 Qac Qc QTg Qc Kad QTp Qt !@s _f 70 JmJe !@s 5 45Qa !@s50 Mm Qc Qc QcQTg QTg Dashed where approximately located; dotted where concealed D_m 5 30 65 30 Mm 5 10 Qc Qp 55 45 Kmg QTg Qc Qc QTg Jm Qc KwqmQac 25 26 QTp Qc 5 !@s Zd 60 _f 60 25 35 Qa D_m MDt Ml 35 QcQp Ktc Kmc Qp Kcl Kcm Kcm 15 *q 42 !@sc 17 Yg Kc Ml 70 *MabKk Kcl Qp 90 Qc Ql Ktc 30 QaJe*q Kevu _pi QTp Qp 51 _w_w Qa Yg 75 80 Kcu 65 Kmg Kcl 45 Qc MAJOR SOURCES OF GEOLOGIC MAPPING Kd 30 Kev _f 15 Qc KclKcl 60 Kk Inverted syncline—Beds in both limbs are overturned and dip away from trace of axial Kevu Kevu 66 45 MDt Pp Qa @s3 10 30 80 Qc Mm 32 Qc 10 Qp _pi _m _p Je 30 !@s Yg 30 Yg Qc Qc Jme 22 45 65 15 !@s _w Ql 60 Qa Qa Qac *q 75 surface shown. Dashed where approximately located; dotted where concealed Kwqm 17 40 37 !@s Ys Qac Kmf Kcm QTgQc Qc *Mab Qa Qa 13 85 40 Pp 5 Qpw 5 80 45 40 KclKcm 30 Qc 40 60 MDt 47 P*pq 15 D_m Qa @s3 Qa 25 20 Kcl Kk *q 1. Freeman, V.L., Ruppel, E.T., and Klepper, M.R., 1958, Geology of part of the Townsend Valley, 35Kd Dj 12 Kd 10 Mm 85 Qc Je Kevu !@s 24 ~!s2 Yg65 _m Kmc Kmg!@s Kwqm Kevu Pp QTp Mm Dj 15 9 _pi 55 *q*Mab 50 45 MDt Kcu QcKe Qc 20 45 25 Broadwater and Jefferson Counties, Montana: U.S. Geological Survey Bulletin 1042-N, p. Kd 36 28 13 30 *q Qp !@s Zd_m57 Je 10 35 _pp Kmb Qc JmeKk Dikes and sills Kwqm 39 Ml QTp Qp Dj Je P*pq Ml *Mab Jm !@s3 50 21 !@s !@s !@s _w Pp !@s 35 45 *Mab Kcm Qp Kmb60 QpQcQa 481-556, Plate N, scale 1:48,000. Modified using geologic mapping of source 7. KwqmKevu *q Ml Qp D_m _f Qc 40Qpw 15 25 40 D_m55 30Qp Ke Kmd Qac Kwqm !@s MDt *a Qp !@sc Qac _w _w 40 Mb 15 Qpw20 75 MDt KclKcl45 Kcu Kcl Qc !@s 40 _f *a *q 10 70 15 Qc Qc Kme 30 Qa *Mab 20 *q QTp D_m _p _f 20 P*pq Mm 20 Qa Kcm Kcl Qa Qc 10 Strike and dip of bedding—Selected attitudes only KwqmKevu 70Qgto !@s !@s Ml 35 Mm _m _f D_m Kc 30Qa 5 @s3 !@s Qa Kk QaKcm QaKma 25 MmMm *q Qgto Qp Dj 10 52 Kqm Jm Mm Qpw 10 Qc 65 40 45 Kcu QTp Kcm Qc Mm 2. Greenwood, W.R., Ludington, Steve, Miller, W.R., and Hanna, W.F., 1990, Mineral Resources of 27 Pp Kad Dj _pi _w Ys Qc Qa Qc QTp Qc Qp Ml KclKcm ~!s25 Jme Kd 14 Kd 40 65 10 5 Yn Qc QTp Kcl Qp Qa Ml 40 25 Qc the Elkhorn Wilderness Study area, Broadwater and Jefferson Counties, Montana: U.S. Qc !@s 35 Kad Dj 70 !@s 5 15 Kcu Kcl Qp !@s 35 MDt 40 Kevu Ml 12 _f 35 Kk Qc Qc D_m Kcl !@s QcQa Kmd Qp MDt DjDj Ql Horizontal Kd Mm 52 20 !@sc 35 Jme @s3 70 Kcm !@s Qp Ml 25 D_m 40 Geological Survey Bulletin 1805, 37 p., Plate 1, scale 1:48,000. Modified using geologic Kwqm QTp Ml 48 25 _m Kc Kk 35 25 QTp QTp Kcl Qp Qc !@s !@s!@s Qac Qc Dj _p _pi 20 _p Qc *q Qa 25 45 55 QacQac Qc _pi D_m Qpw Mm Qa 60 70 45 90 P*pqKcl QTp QTp Kme !@s D_m Qc _pQc mapping of source 7. 30 Kev Qp D_m _pi 28 _p _p 10 !@s Yg 40 !@s !@sQac Qoa 30 _m 40 27 !@s Qpw _pi 20 80 Qa Dj _pi Qc Qa 15 _pp Ql Yl _m Kcm 45 Inclined Kevu Kad Dj 17 _pi Qc Qc Qc !@s 60 90 15 Qp Qc Qp 30 _pp QlQc Kcl 35 45 34 Mm Pp D_m Qa Qa DjMDt Kcm Qc Qp D_m 20 Ktc 45 Qac Dj !@s Qpw Qc30 Qc !@s Qac Dj 15 D_mMDt Kcu 16 QTp !@sc Qa D_m Qa Qpw !@s @s3 25 30P*pq Kcu 40 Qoa _m_wf Ml 65 Keva 3 *a !@sc D_m 65 25 5Qpw Yg 55 QTp Kcm Qp Qp !@s Qc _m 40 _pi Dj 50 3. Klepper, M.R., Ruppel, E.T., Freeman, V.L., and Weeks, R.A., 1971, Geology and mineral Kad !@s QTp 26 31 25 Qpw !@s Qc 45 40 70 Jme Kcl Qp 15 _f Kk Overturned Kevu Kd 8 Ml Dj Dj10 _m Kk35 Qa !@sQpw 45 35 55 Qc QTp !@sQp !@s 90 !@s Kd !@sc D_m_pi Kc !@s 10 Yg Qpw Qc _f 60 Jme Qc_w Qa _m Jme Ke deposits, east flank of the Elkhorn Mountains, Broadwater County, Montana: U.S. 28 37*a 18 QTp QTp Ml D_m 24 QTp1 Yg P*pq 40 Qc Kk !@s Ql20 Keva Keva *a 50 20 *q Kev Kev 5 QTp1 !@s15 45 25 Qc Qc !@s Qc Dj Yl 75_f_w_p Kd QTp *q Pp Kk Dj Dj 65 Qc 65 Qpw 60 50 MDt QcKcu Jme !@s D_m 45 Qc Ke Kma Geological Survey Professional Paper 665, 66 p., Plate 1, scale 1:48,000. Modified using Kd Kevu *q *a 25 Kd Kd 75 !@s 55 55 50 70 Kk Kcm50 Qoa Qc !@s Kad QTp !@s Mm19 Qpw 30 Yg !@s2 10 60 _pp 45 40 Kcl Vertical Pp *q Kk Kev Kev Kd QTp Mm Dj Je*q !@s Yg 20 Ml Mm 20 Mm Kcl Qa Qp Ql QTg 60 geologic mapping of source 7. !@s Kev Ml KkJm Qa Yg !@s _p MDt Qa 10 Qp Qc Qa Qc 60 Kma Kmo PpQa @s3@s3 Qa _m Jme KcuQTpQcKcl Qc Qac Qc Qc Ke !@s Ml Kcm !@s Qp Qa 20 4. Klepper, M.R., Weeks, R.A., and Ruppel, E.T., 1957, Geology of the southern Elkhorn Mountains, Inclined layering in igneous rock—Showing strike and dip Jefferson and Broadwater Counties, Montana: U.S. Geological Survey Professional Paper 10 292, 82 p., Plates 1-3, scale 1:48,000. Modified using geologic mapping of source 7. Inclined foliation in layered gneiss or schist —Showing strike and dip SCALE 1:100 000 18° Base from U.S. Geological Survey, 1976 Digital database by Theodore R. Brandt 30 1 0 1 2 345 678 MILES Inclined joint—Showing strike and dip Photoinspected 1991 H Supplementary point digital data by Kenzie J. Turner 5. Nelson, W.H., 1963, Geology of the Duck Creek Pass quadrangle, Montana: U.S. Geological MONTANA T R O Color design of geologic map by Mitchell W. Reynolds Survey Bulletin 1121-J, p. J1-J56, Plate 1, scale 1:62,500. Modified using geologic N Vertical joint—Showing strike and dip 1 012 354 6 789 10 KILOMETERS IC mapping of source 7. Projection and 10,000-meter grid: Universal Transverse Mercator, Zone 12, T Correlation of map units, and Index to geologic Norcen Energy NE

G TRUE NORTH Resources, Ltd. 25,000-foot ticks: Montana coordinate symtem, south zone A mapping drafted by Lisa Ramirez Rukstales Oil or gas test hole—Showing operator and hole number CONTOUR INTERVAL 50 METERS M 6. Reynolds, M.W., U.S. Geological Survey, unpublished detailed geologic mapping, scale 1:24,000. Kimpton Ranch 1-11 APPROXIMATE MEAN Published by USGS Publishing Network NATIONAL GEODETIC VERTICAL DATUM OF 1929 DECLINATION AT 1927 North American Datum QUADRANGLE LOCATION CENTER OF MAP, 1975 Manuscript approved for publication May 4, 2006 7. Reynolds, M.W., U.S. Geological Survey, unpublished reconnaissance and local detailed geologic ELEVATIONS SHOWN TO THE NEAREST METER mapping, scale 1:24,000.

8. Robinson, G.D., 1967, Geologic map of the Toston quadrangle, southwestern Montana: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-486, scale 1:24,000. Modified using geologic mapping of source 7.

9. Skipp, Betty, and Peterson, A.D., 1965, Geologic map of the Maudlow quadrangle, southwestern Montana: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-452, scale 1:24,000. Modified using geologic mapping of source 7.

PRELIMINARY GEOLOGIC MAP OF THE TOWNSEND 30’ x 60’ QUADRANGLE, MONTANA 10. Weeks, R.A., 1974, Geologic map of the Bull Mountain area, Jefferson County, Montana, U.S. Geological Survey Open-File Report 74-354, Scale 1:48,000. By

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ArcInfo coverages and a PDF for this map are available at 2006 http://pubs.usgs.gov