UTAH GEOLOGICAL SURVEY a division of Utah Department of Natural Resources in cooperation with Plate 2 U.S. Department of the Interior Utah Geological Survey Miscellaneous Publication 173DM U.S. Geological Survey Geologic Map of the Newfoundland Mountains and east p art of the Wells 30' x 60' Quadrangles

CORRELATION OF MAP UNITS LIST OF MAP UNITS GEOLOGIC SYMBOLS INDEX TO GEOLOGIC MAPPING

Surficial Quaternary-Tertiary Surficial Deposits Tertiary (Paleogene) Igneous and Sedimentary Rocks Devonian Rocks Contact –Long dashed where approximately Axial trace of anticline – Dotted where 114° 113°30' 113° MAP NAME AND AUTHORS Deposits, 41°30' 41°30' undivided located, short dashed where inferred, dotted JJJconcealed Depositional Environment Qu Ttc Dp (cross Surficial deposits, undivided (Holocene and Pleistocene) Rhyolitic tuff and sedimentary rocks (Eocene) Pilot Shale where concealed 1. Lucin NW - Miller and Oviatt, 1994 section Axial trace of syncline – Dotted where 2 2. Bovine Mountain - Jordan, 1983 only) Alluvial Playa and Spring Lacustrine and Mixed-Environment Eolian Mass-Movement Alluvial Deposits Trd Rhyodacite (Eocene) Dg Guilmette Formation Bedding plane fault – Long dashed where """ concealed 3. Terrace Mountain West - Miller and McCarthy, 2002 approximately located, dotted where 18 1 19 3 4 Qam Qal Qafy Qpm Qsm Qei Qes Qeo Qem Qmc Qam Alluvial mud (Holocene) Tg Granodiorite dikes (Eocene) Ds Simonson Dolomite concealed; ticks on hanging wall 4. Terrace Mountain East - McCarthy and Miller, 2002

Qms Holo. Qu Line of cross section Qafo Qlm Qli Qls Qlg Qla 20 5. Tecoma - Miller and Schneyer, 1985 Qal Stream alluvium (Holocene) Tbc Bettridge Creek Granodiorite (Eocene) Devonian and Silurian Rocks Overturned low-angle normal fault – Dotted 6. Lucin - Miller, 1985 where concealed; teeth on hanging wall 21 Qb Qafy Young alluvial-fan deposits (Holocene) DSd Thick–bedded dolomite, undivided 7. Pigeon Mountain - Glick and Miller, 1987 QTaf ~ 1 Ma QUATERNARY Tm McGinty Monzogranite (Eocene) Bedding form lines (cross section only) Pleistocene Low-angle normal fault – Long dashed where 8. Jackson - Miller and Glick, 1987 ? Qafo Older alluvial-fan deposits (Pleistocene) Teg Emigrant Pass intrusion of Compton and others (1977) (Eocene) DSlm Lone Mountain Dolomite approximately located, dotted where Sedimentary bedding attitude - 9. Patterso n Pass - Miller and others, 1993 Tby concealed; teeth on hanging wall 5 6 7 8 ~ 4 Ma Plio. QTaf Oldest alluvial-fan deposits (Pleistocene and Pliocene?) Jurassic Plutonic Rocks DSu Undivided dolomite and limestone 10. Crater Island NW - Miller, 1993 Steeply dipping normal fault – Long dashed Unconformity; low-angle normal fault in Pilot Range Inclined 11. Lemay Island - Miller and Glick, 1986 Playa and Spring Deposits Jms Miners Spring Granite Silurian Rocks where approximately located, short dashed 12. Lucin 4 NW - Glick and Miller, 1986 ? where inferred, dotted where concealed; bar 41°15' 41°15' Tt Tr ~8 - 10 Ma Qpm Playa mud (Holocene) Jgd Granodiorite Sl Laketown Dolomite and ball on downthrown side 13. Pilot Peak - Miller and Lush, 1994 Tbi ~10.5 Ma Inclined, orientation approximate 14. Crater Island SW - Miller, 1990c CENOZOIC Qsm Spring mud (Holocene) Jpm Porphyritic monzogranite Ordovician Rocks Normal fault, geophysical, gravity – Dotted 23 Ts NEOGENE 15. Crater Island - Miller and others, 1990a Tdb G where concealed and very approximately 9 10 11 12 Miocene Oes Overturned Lacustrine and Mixed-Environment Deposits Jc Ely Springs Dolomite located; bar and ball on downthrown side 16. Lucin 4 SW - Miller, 1990a Tt Td Tr ~12 - 14 Ma Crater Island Quartz Monzonite TERTIARY 17. Newfoundland Mountains - Allmendinger and Jordan, 1989 Qlm Lacustrine marl (Pleistocene) Jn Oe Eureka Quartzite Thrust fault – Dotted where concealed; teeth 17 23 Newfoundland Stock of Caroon (1977) Vertical 18. Jackson Spring area - Douglas, 1984; Miller and Felger, unpublished mapping Tsc on hanging wall 22 Ts Tbi ~18.5 Ma Qli Lacustrine silt (Pleistocene) Triassic Rocks Ocw Crystal Peak Dolomite and Watson Ranch Quartzite 19. Lucin NE-Bovine area - Miller and Felger, unpublished mapping; Compton ? Fault, unknown type – Long dashed where Volcanic and metamorphic foliation - and others, 1983, unpublished mapping Unconformity; low-angle normal fault in Pilot Range Qls Lacustrine sand (Pleistocene) ^d Dinwoody Formation Ol Lehman Formation approximately located, dotted where 20. Sheep Mountain area - Miller and Felger, unpublished mapping concealed Horizontal 13 14 15 16 21. Hogup Mountains area - Stifel, 1964; Miller, unpublished mapping Qlg Lacustrine gravel (Pleistocene) Permian Rocks Ok Kanosh Shale Ttc ~37 Ma Tg Tbc Tm Teg ~34 - 42 Ma 22. Grassy Mountains area - Doelling, 1964; Miller, unpublished mapping Fault, gravity slide – Ticks on hanging wall Eocene Qla Lacustrine and alluvial deposits, undivided (Pleistocene) Pg Gerster Formation Opl Lower Pogonip Group Trd PALEOGENE Inclined 23. Great Salt Lake Desert - Miller, unpublished mapping 41° 41° Unconformity Unconformity Eolian Deposits Pm Murdock Mountain Formation Ordovician and Cambrian Rocks Zone of structural accommodation 114° 113°30' 113° Qei Eolian silt (Holocene) O_n Notch Peak Formation Vertical Jms Jgd Jpm Jc Jn ~155 - 160 Ma Ppm Phosphoria Formation, Meade Peak Phosphatic Shale Tongue Published map Unpublished, reconnaisance, and thesis mapping Lake Bonneville shorelines --

JURASSIC Qes Eolian sand and silt (Holocene) Pgr Grandeur Formation of the Park City Group Cambrian Rocks Bonneville shoreline – Dashed where Unconformity B B _cs Corset Spring Shale Member of the Orr Formation B B B Northern Pilot Range, Lion Mountain, Qeo Eolian ooid sand (Holocene) Ptc Trapper Creek Formation approximately located Ground water well

Lemay Island, Pigeon Mountain, Bovine Mountains, Terrace Mountain, MESOZOIC _j and Little Pigeon Mountains and the Hogup and Grassy Mountains Qem Eolian mud (Holocene) Pbg Johns Wash Limestone Member of the Orr Formation Provo shoreline – Dashed where Badger Gulch Formation P PPPP approximately located Drill hole – Oil/gas exploration ^d Fault or depositional ^d Not pres ent in Grassy Mountains Mass-Movement Deposits _c Candland Shale Member of the Orr Formation contact with Pm TRI. Pp Pequop Formation Pg Only present at Lemay Island Pg Qmc _sd S SSSS Stansbury shoreline Colluvium and talus (Holocene) Pu Unnamed sandstone unit Sandstone and dolomite Pm Pm Qms Landslide deposits (Holocene and Pleistocene) _b Big Horse Limestone Member of the Orr Formation Southern Pilot Range, Crater Island, Ptf Third Fork(?) Formation Pilot Valley shoreline – Dashed where Ppm VVVVV V and Newfoundland Mountains Ppm approximately located Quaternary Volcanic Rocks _l Lamb Dolomite Pgr Pgr Pgr Pr Riepetown Sandstone Qb Gilbert shoreline – Dashed where PERMIAN Basalt of Sheep Mountain (Pleistocene) GGGGG G Ptc Permian and Pennsylvanian Rocks _tr Trippe Limestone Pp Pu approximately located Pbg Tertiary (Neogene) Igneous and Sedimentary Rocks Posl Oquirrh Group, Interbedded sandstone and limestone unit _to Toano Limestone Ptf Pr Posl Tby Younger basaltic lava flows (Pliocene) *os Oquirrh Group, Sandstone unit _ks Killian Springs Formation P*s P*s *os Ts Salt Lake Formation, undivided (Miocene) Unconformity Unconformity in *ol Cambrian and Neoproterozoic Rocks Grassy Mtns Oquirrh Group, Limestone unit LITHOLOGIC COLUMN

Unconformity *e *ol PENN. Tsc Salt Lake Formation, conglomerate (Miocene) _Zpm P*s Strathearn Formation Prospect Mountain Quartzite *Mdc *Mdc *Mdc Southern Pilot Range, Crater Island, Newfoundland Mountains Low-angle normal fault Tt Tuff and tuff breccia (Miocene) Neoproterozoic Rocks common at base of IPMdc *e Mtp Mj MISS. Ely Limestone Tr Rhyolite (Miocene) Zmg McCoy Creek Group of Misch and Hazzard (1962), Unit G Fault(s) in Pilot Range Dp Pennsylvanian and Mississippian Rocks AGE GEOLOGIC MAP THICKNESS LITHOLOGY NOTES Dg Dg Fault Td Zmf Dacite (Miocene) *Mdc Diamond Peak Formation and Chainman Shale, undivided McCoy Creek Group of Misch and Hazzard (1962), Unit F UNIT SYMBOL Meters DSu (Feet)

Ds Ds DEVONIAN Tbi Intermediate-age basaltic lava flows (Miocene) Zme McCoy Creek Group of Misch and Hazzard (1962), Unit E Mississippian Rocks Grandeur PCGp Pgr >120 (>400) DSlm Fm DSd Tdb Diabase (Miocene) Mtp Tripon Pass Limestone Zmd McCoy Creek Group of Misch and Hazzard (1962), Unit D

Sl Sl SIL. Zmb McCoy Creek Group of Misch and Hazzard (1962), Unit B(?) Pequop 450–550 Oes Oes Oes Mj Joana Limestone Pp PALEOZOIC Formation (1500–1800)

PERMIAN LITHOLOGIC COLUMN Oe Oe Oe Zma McCoy Creek Group of Misch and Hazzard (1962), Unit A(?)

Ocw Thrust faults common Ocw Riepetown Ss Pr 90 (300) Bovine Mountains, Terrace Mountain, Hogup Mountains, Grassy Mountains in this interval in the Strathearn Fm P*s 5–40 (16–130) Unconformity Low-angle normal fault Ol Newfoundland Mountains Ely >250 Low-angle normal fault *e Ok ORDOVICIAN Limestone (>820) AGE GEOLOGIC MAP THICKNESS LITHOLOGY NOTES

PENN. UNIT Diamond SYMBOL Meters Opl Opl Opl Commonly Peak Fm, <375 (Feet) *Mdc structurally Chainman (<1230) O_n LITHOLOGIC COLUMN thinned Shale Not present in

_cs MISS. Mj Dinwoody 400–600 Grassy Mtns Northern Pilot Range, Lion Mountain, Lemay Island, Pigeon Mountain, Joana Ls 125 (410) ^d Formation (1300–2000) _j _sd and Little Pigeon Mountains Pilot TRIASSIC Dp 300 (980) _c Shale

_b AGE GEOLOGIC MAP THICKNESS LITHOLOGY NOTES UNIT SYMBOL Meters Gerster 485–600 _l (Feet) Pg Guilmette <550 Formation (1600–1970) Dg Fm (<1800) _tr Dinwoody Fm ^d 110 (360) Fault or contact with Pm TR. CAMBRIAN only at Pigeon Mountain DSu Gerster >240 (>770) Pg only at Lemay Island Pg DEVONIAN Pilot Peak detachment fault Fm (3600) 1100 Simonson 355 Ds Dol (1165) Murdock _to Mountain Murdock undivided dolomite and limestone Formation _ks Mountain Lone 1000 Fm Pm 715 250 Pm (2400) Mtn DSlm (3300) _Zpm (820) Dol Zmg SIL. Laketown Sl 260 (850) LITHOLOGIC COLUMN Phos- Meade Dolomite Zmf phoria Peak Phos- Meade phoria Peak Fm Tongue Ppm 40–105 (130–350) Ely Springs Zme Cenozoic Rocks Oes 180 (590) Fm Tongue Dolomite Ppm 40–120 (130–400) Zmd Eureka Qtz Oe 150 (490) AGE GEOLOGIC MAP THICKNESS LITHOLOGY NOTES UNIT SYMBOL Meters Ocw Thrust faults in Zmb 750 CP Dol, WR Qtz 100 (330) 560 NEOPROTEROZOIC (Feet) (2500) Newfoundland Mountains Pgr Pgr Ol (1840) maZ Lehman Fm 135 (440) Grandeur Formation Grandeur Formation

YYY Y Park City Gp

Y YYY Ok

Park City Group Kanosh Sh 140 (460) ORDOVICIAN

YYY PERMIAN

YYY Trapper Creek Lower 470 Ptc 200 (650) PERMIAN Fm Pogonip Opl (1540)

YYY Y Group Unnamed

Y

Y Y Y 1630 sandstone Pu (5350)

YYY Y unit

YY Y Y Badger 730 Pbg Notch

YYY Gulch (2400) 500

Y YYY Peak O_n Salt Fm (1640) Ts >5,000 Fm Lake (>15,000) Formation MIOCENE

TERTIARY YYYY Y CS Sh Mbr _cs 15–20 (50–66)

Y YYYY Third JW Ls Mbr _j 80–120 (260–390)

YYYY Y >220–500

Y YYYY Ptf

Fork(?) C Sh Mbr inter- YY _c YYY (>700–1500) 60 (200) Fm bedded Ss and _sd >125 (>410) 2000

Orr Fm Dol ss and Posl

YYY Y Strathearn Fm P*s 5–40 (18–130) (6600)

Y YYY Unconformity ls Big Horse _b 180 (590) Diamond Pk Fm, 20–185 Ls Mbr unit PENN. *Mdc

YYY Chainman Sh (60–600) 75, >160 YYY Lamb Dol _l Low-angle normal (250, >535) 9–60 fault common

conglomerate Tsc (40–200) YYY Trippe Ls _tr >135 (>440)

YYY Y MISS. Tripon 425 Mtp CAMBRIAN Pilot Peak detachment fault Pass (1400) Igneous units include Qb, Tby, Tbi, Tr, Tt, Td, Tdb, Ttc, Trd, Tg, Tbc, Tm, Teg Ls sand- 700 stone *os

Oquirrh Group (2300) Toano <600, 850 unit _to Guilmette Dg 390 Limestone (<1960, 2800) Fm (1290)

Simonson lime- Ds 365 Killian Springs 100–300 500 Dolomite _ks stone *ol (1200) Fm (330–990) PENNSYLVANIAN (1650) DEVONIAN unit

Thick-bedded 500 dolomite DSd Diamond *Mdc and underlying (1650) Peak Fm, <375 unit Prospect *Mdc strata structually thinned _Zpm Chainman (<1230) at Bovine Mtns SIL. Mountain 955 M. Shale Quartzite (3130) Ely Springs Dol Oes 130 (425) Fault Eureka 160 (525) Quartzite Oe Laketown 260

SIL. Sl Low-angle normal fault Dolomite (850) Lower 320 Ely Springs Pogonip Opl Oes 180 (590)

ORDOVICIAN Dolomite Group (1050) B SOUTHWEST NORTHEAST B' Eureka Qtz Oe 150 (490) Bend Bend 490–1150 3000 3000 Unit G Zmg (1575–3775) CP Dol, WR Qtz Ocw 100 (330) Hogup Mountains Low-angle normal fault Projected Dolphin Island Qu Ts Lower ORDOVICIAN 470 2000 Qu WIN 433684 WIN 433684 Qu 2000 Tertiary and/or Quaternary volcanic rocks Qu Ppm Great Salt Lake Pogonip Opl (1540) may be present in subsurface, based on Pgr Qu Group Tby > Gunnison Bay aeromagnetic data Pgr 430 Pgr 125m (500ft) Unit F Zmf Qu Pg Pgr Posl (1410) 396m (1300ft) Pu > Ts 1000 Pm 1000 Ts Posl Pm > Posl Pgr Ppm NEOPROTEROZOIC

Pu *os ? Pgr *os Unit E Zme 250 (820)

Ppm > *ol

? McCoy Creek Group

? 0 ? > > 0 Pu Posl *ol Unit D Zmd 220 (720) Pu Pgr *os G Pu Unit B(?) Zmb 155 (510) Elevation in meters G Elevation in meters Paleozoic rocks

-1000 *os -1000 ? Pu *ol Paleozoic rocks >450 Posl Unit A(?) Zma Posl Posl *ol (>1475) Paleozoic rocks -2000 -2000 No vertical exaggeration Igneous units include Jn, Jgd, Jpm, Jc, Jms Scale 1:62,500

A WEST Pilot Range Lemay Island Crater Island Newfoundland Mountains EAST A' Bend Bend Bend Bend Bend Bend Bend Bend Bend 3000 3000 Pilot Peak detachment Mtp Dg Mtp fault (Miocene)

Dg Great Salt Lake Desert ? Pilot Valley Playa

Ptc Ocw Qu ? Pgr Oe Qu 2000 Ds Qu Oes Ocw 2000 Ds Qu Qu Qu Pgr Pp PrP*s Pbg Qu Opl Qu Newfoundland Evaporation Basin Oe Qu Ptf Ptc Qu *Mdc _j _l _sd _b Qu *Mdc *Mdc Pp _c DSd Ttc Ok Pp Ds _cs P*s Sl Opl Mj _b O_n _l > Paleozoic rocks, Tm Ts _tr > Possible sediment Pbg Pr Pp _l Pp Dg O_n 1000 structure uncertain Possible sediment P*s Dg O_n Possible sediment Possible sediment Possible sediment Pp _l 1000 younger than Ts Ptf Trd younger than Ts Dg younger than Ts younger than Ts younger than Ts Ds Pilot Peak detachment fault Miocene(Miocene) detachment fault Dg *Mdc Dg _tr Ts Ts Cambrian Pilot Peak detachment fault (Eocene) Ds _b _l Ttc? Zme Ds Mj Dg Ol rocks Paleozoic rocks, Ts Dg

DSd Pbg Ds Ds structure uncertain Pm > ? P*s DSd Ds Dg Ptc Pgr Pg Ts Ds Opl _tr Ds 0 Zmf Zme Trd Sl DSlm > 0 Ordovician rocks Oes Ttc?

_to

Zmd Paleozoic rocks, ? Ppm Volcanic rocks inferred from ? Ts ?

structure uncertain Pilot Peak detachment fault (Eocene) > > Ordovician rocks Pg Oe Opl aeromagnetic and seismic data ? Elevation in meters Pilot Peak detachment fault (Miocene) > Jn Elevation in meters *Mdc Ocw Ol -1000 Ok Opl O_n Jn -1000 Zmf Pm G _ks Opl Paleozoic and Proterozoic G Triassic and Paleozoic rocks, Paleozoic rocks, Ttc G Zmd rocks, structure uncertain structure uncertain G structure uncertain

Zmg Triassic and Paleozoic rocks, G Paleozoic rocks, ? O_n _Zpm structure uncertain structure uncertain _Zpm G Paleozoic rocks, -2000 Early Paleozoic and Proterozoic -2000 Paleozoic and Proterozoic Paleozoic rocks, structure uncertain Paleozoic rocks, G Early Paleozoic and Proterozoic rocks, structure uncertain Zmg rocks, structure uncertain structure uncertain rocks, structure uncertain structure uncertain No vertical exaggeration Scale 1:62,500