U.S. Department of the Interior Scientific Investigations Map 2942 U.S. Geological Survey Sheet 2 of 2 Pamphlet accompanies map

157°07'30" 157° 156°52'30" 156°45' 156°37'30" 156°30' 156°22'30" 156°15' 156°7'30" 156° 61° ls s LIST OF MAP UNITS ^km Middle Member Ols Oab Oab s Sab Oab bu s Sab Oab Kk [See Description of Map Units (in pamphlet) for complete unit descriptions. Some exposures Sab Oab Ols Olss ^kb Bruin Limestone Member Oab s? Oab Os on the plotted map are too small to distinguish the color for identification. These units are Sab Sls H Sls labeled where possible, and unlabeled units are attributed in the database] ^sh Gray shale and gray volcaniclastic sandstone (Triassic) o Sab? bu Sab Sab h bu o Sab UNCONSOLIDATED DEPOSITS AND ROCKS NOT ASSIGNED TO A PROVINCE STRUCTURAL ASSEMBLAGE Sab l i Sab Qs Surficial deposits, undivided (Quaternary) JPk Kakhonak and Tlikakila Complexes (Jurassic, Triassic, and Permian(?) or Sls bu t 60°57'30" n older(?)) a Kkn bu Bedrock unknown (age unknown)—Not shown in Correltation of Map Units bu Sls Fuller Qs IGNEOUS ROCKS lc? Kk Kuskokwim Group, undivided (Cretaceous, Campanian(?) to Albian(?)) Mountain Qv Volcanic rocks, undivided (Quaternary)

lc? Kkn Nearshore facies (Cretaceous) Qhv Volcanic rocks (Quaternary, Holocene) T Sls i Sab r Kkv Volcanogenic rocks (Cretaceous(?)) Qs t e Qdf Debris-flow deposits (Quaternary, Holocene) Jssc? Kk v n i R u AHKLUN MOUNTAINS PROVINCE Sab Qmf Volcanic rubble and mudflows (Quaternary, Holocene) 60°55' k TKgr Sls Kkn lc SEDIMENTARY ROCKS Qamp Andesite and dacite domes bu Qs? Qs bu KJvs Volcanic and sedimentary rocks (Lower Cretaceous to Middle Jurassic) QTv Volcanic rocks, undivided (Quaternary, Pleistocene, or Tertiary, Pliocene) Sls? KJv Olivine basalt and fragmental volcanic rocks (Cretaceous or Jurassic) Dn bu Sls Alaska-aleutian Range Batholith of Reed and Lamphere (1969) lc Kk Jssc Qs? Dn Jkw Graywacke of Kulukak Bay (Upper to Middle Jurassic) Ti Sls Sls? Intrusive rocks, undivided (Tertiary) Kkn

Os S STRUCTURAL ASSEMBLAGE Tig Kkn o Granite and aplite (Tertiary, Oligocene(?) and younger) 60°52'30" Kk

C Togiak-Tikchik Complex (Lower Cretaceous to Lower Paleozoic) u Kk Kkn Tpgr

r t Peralkaline granite

h }m Melange (Mesozoic(?)) e

e Tign Gabbronorite K^agi

k Argillite and graywacke, cut by dike swarms (Lower Cretaceous to Upper

Triassic) Togd Granodiorite and quartz monzodiorite (Tertiary, Oligocene and late Eocene) bu Kkn K^ag Argillite and graywacke (Lower Cretaceous to Upper Triassic) Teg Granite (Tertiary, late Eocene) Jms Sedimentary rocks (Lower Jurassic) Tipg Older granite (Tertiary, Paleocene) 60°50' Qs J^p Phyllite and chert (Lower Jurassic and Upper Triassic(?)) TKg Tigd Granodiorite (Tertiary, Paleocene) Kk F o ^cg Chert and limestone (Upper Triassic) Kkn r k KJg Mafic granitic rocks (Cretaceous and (or) Jurassic) ^v Volcanic rocks (Upper Triassic) Kk Jtr Trondhjemite (Late Jurassic) Qs ^|rc Rainbow chert (Triassic(?) to Paleozoic(?)) bu Kk Jla Lamprophyre and basalt dikes (Jurassic) bu Pv Volcanic rocks (Permian(?)) Kk? Jqm Granodiorite and quartz monzonite (Jurassic) Qs 60°47'30" Pls Kk Kk Limestone (Permian) bu Jqd Quartz diorite, tonalite, and diorite (Jurassic) Kk Kk Pcs Clastic rocks (Permian(?)) Jmu Kk? Kk Mafic and ultramafic plutonic rocks (Early Jurassic) Kkn MDv Greenstone and schist (Mississippian(?) and (or) Devonian(?)) ^c Cottonwood Bay and Chilikadrotna Greenstones (Triassic) |c Black chert (lower Paleozoic(?)) Figure 1. Enlarged part of map showing Paleozoic and Proterozoic rock units of the Lime Hills province METAMORPHIC ROCKS in the northeastern Taylor Mountains quadrangle. LIME HILLS PROVINCE }|b Metamorphosed mafic volcanic and sedimentary rocks (Mesozoic and (or) Paleozoic) SEDIMENTARY ROCKS Jssc Chert, sandstone, and siltstone (Lower Jurassic) IGNEOUS ROCKS, ALL PROVINCES CORRELATION OF MAP UNITS Tvu ^lc Limestone, silty limestone, and chert (Upper Triassic, Norian) Volcanic rocks, undivided (Tertiary) [See Description of Map Units (in pamphlet) for precise unit ages] Tb DSilurian, Pridoli and Ludlow) TO A PROVINCE AHKLUN MOUNTAINS PROVINCE LIME HILLS PROVINCE ALASKA ALEUTIAN RANGE PROVINCE IGNEOUS ROCKS, ALL PROVINCES Tvr Felsic volcanic rocks Sls Lime mudstone (Upper Silurian, Wenlock to late Llandovery) Tmv Volcanic rocks, undivided (Tertiary, Oligocene and Eocene) SEDIMENTARY STRUCTURAL METAMORPHIC Olss Tcherskidium-bearing limestone (Upper Ordovician, Ashgillian) SEDIMENTARY ROCKS STRUCTURAL ASSEMBLAGE SEDIMENTARY ROCKS ROCKS ASSEMBLAGE IGNEOUS ROCKS ROCKS Tmf Tuffaceous felsic volcanic rocks Os Shale (Ordovician) Qhv Qdf Qmf Tmba Basalt and andesite Oab Algal boundstone and lime mudstone (Lower Ordovician) Qs Qv Qamp QUATERNARY Tvig Ignimbrite (Tertiary, Paleocene) QTv Ols Lime mudstone (Lower Ordovician) TKv Volcanic rocks (Tertiary and (or) Cretaceous) ? _ls Limestone (Middle Cambrian) Tb TKr Rhyolite and dacite flows, tuff, dikes, and sills Ts _s Clastic and carbonate rocks (Lower Cambrian) Tig Tpg Ttyh TKb Basalt flows

Any use of trade, product, or firm names in this publication is for descriptive purposes only Bedrock Geologic Map of the Northern Alaska Peninsula Area, Southwestern Alaska and does not imply endorsement by the U.S. Government This map was printed on an electronic plotter directly from digital files. Dimensional calibration may vary between electronic plotters and between X and Y directions on the same plotter, and paper may change size due to atmospheric conditions; therefore, scale Compiled By and proportions may not be true on plots of this map. For sale by U.S. Geological Survey, Information Services, Box 25286, Federal Center, Frederic H. Wilson, Robert B. Blodgett, Charles D. Blome, Solmaz Mohadjer, Denver, CO 80225, 1–888–ASK–USGS Digital files available at https://doi.org/10.3133/sim2942 Suggested citation: Wilson, F.H., Blodgett, R.B., Blome, C.D., Mohadjer, S., Preller, C.C., Cindi C. Preller, Edward P. Klimasauskas, Bruce M. Gamble, and Warren L. Coonrad Klimasauskas, E.P., Gamble, B.M., and Coonrad, W.L., 2017, Bedrock geologic map of the ISSN 2329-132X (online) Alaska Peninsula area, southwestern Alaska: U.S. Geological Survey Scientific 2017 https://doi.org/10.3133/sim2942 Investigations Map 2942, pamphlet 43 p., scale 1:350,000, https://doi.org/10.3133/sim2942.