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HomeMy WebLinkAboutRR-46 Contreras et. al 2014-03_Geologic Map of Quilicene 7.5-minute Quadrangle (proposed)???????????Evc Evc Evc Em2t Em2t Em2t Em2t Qgic Qgdp Qgdd Qcw Qcw Qgdd Qgdp Qcw Qcw W55W52W51W50500 -1500 -1000 -500 0 A SOUTH Elevation (feet)3x vertical exaggeration 1000 -1000 -500 -1500 500 A′ NORTH 0 1000 Qgic Qgic QoaQuilcene Bay Dabob BayLindsay Hill RoadMcDonald RoadW59W60Qaf Qgdd Qmwanticlinesyncline synclineElevation (feet)Qp GEOLOGIC SYMBOLS IN CROSS SECTIONS Fault—Solid where location accurate; dashed where inferred; queried where identity or existence questionable. Arrows indicate relative vertical motion. Arrow point ( ) indicates motion toward the viewer, and arrow feathers ( ) indicate motion away from the viewer. Surficial geologic units too thin to show as polygons at the scale of the cross sections. Black tick marks separate units. Water well?W10D U DU D U DU? ? ? ?? ? ? ???????? ? ? ? ???????? ? ? ? ? ? ? ? ? ? ??? ?????????????????? ? ? ? GD18,19 GD5 GD9 GD13 GD12 GD2, 3 GD10 GD15 GD4 GD17 GD16 GD6,7 GD1 GD11 GD20 GD8 GD14 2 61 52 54 23 61 52 72 5 15 34 20 79 16 9 55 24 62 4 3 8466 54 10 7567 21 4 51 69 6 26 10 83 9 67 11 70 31 64 44 15 5 21 3 28 8 52 24 11 026 29 0 24 18 2 19 14 W7 HVSR2 W61 W30 S4 W1 W62 W20 HVSR1 W48 W58 S9 W2 W59 W22 W39 W3 S8 W35 W37 W45 W38 S1 W40 W33 W36 W53 W24 P1 W46 W43 W31 W49 W18 S2 W54 W26 W23 W34 W32 S6 W51 W27 W21 W50 W19 S3 W52 S7 W69 W16 W25 W67 W60 W55 W64 W14 W13 W71 S5 W56 W41 W12 W65 W66 HVSR6 W57 W8 W15 W70 W17 HVSR5 W42 W4 W11 W68 W6 HVSR4 W47 W28 W10 W72 W5 HVSR3 W44 W29 P2 W9 W63 Qgdp Em1c Em2a Em2a Em2ss Em2ss Em2ss Em2ss Em2ss Em2ss Em2ss Em2t Em2t Em2t Em2t Em2t Em2t Em2t Em2t Evc Evc Evc Evc Evc Evc Evc Evc Evc Evc EvcEvc Qpd Qpd Qpd Qpd Qpd Qpd Qpd Qpd Qp Qp Qp Qp Qp Qp Qp Qp Qp Qp Qp Qp Qoaf Qoaf Qoaf Qoaf Qoaf Qoa Qoa Qoa Qoa Qoa Qoa Qmw Qmw Qmw Qmw Qmw Qmw Qmw Qmw Qmw Qmw Qmw Qmw Qmw Qmw Qmw Qmw Qmw Qmw Qmw Qmw Qmw Qmw Qmw Qmw Qmw Qls? Qls? Qls? Qls? Qls? Qls? Qls? Qls? 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Qco Qco Qco Qco Qco Qco Qco Qco Qco Qco Qco Qco Qco Qco Qco Qco Qco Qco Qco Qco Qco Qco Qco Qco Qco Qco Qco Qco Qco Qco Qco Qco Qco Qco Qco Qco Qco Qco Qco Qb Qb Qb Qb Qb Qb Qb Qb Qb Qb Qa Qa Qa Qa Qa Qa Qa Qa Qa Qaf Qaf Qaf Qaf Qaf Qaf Qaf Qaf Qaf Qaf Qaf Qaf Qaf Qaf Qaf Qaf Qaf Qaf Qaf Qaf Qaf Qaf Qaf ml ml ml ml Qc Qc Qc Qgdp Qco Qco Qco Qco Qgic Qgic Qgic Qco Qco? Qco Qco Evc A′ A S e i s m ic lin e 8 0 S eis m ic line 81 Seismicline79Naval base Kitsap–Bangor boundaryNaval base Kitsap–Bangor boundary D A B O B B A Y F A U L T Z O N E DABOB BAY FAULT ZONE 122°45′00″47°52 ′30″122°52′30″ 47°52 ′30″ R 2 W R 1 W 47 ′30″47 ′30″ 47 ′30″ 47 ′30″ 50′00″ 122°45′00″ 47°45′00″ 122°52′30″ 47°45′00″ 50′00″ 50′00″ 50′00″R 2 W R 1W T 28 N T 27 N T 27 N T 26 N T 28 N T 27 N T 27 N T 26 N LOFAL L F A U L T Z O N E LOFALL FAULT ZONE SEATTLE F A U L T Z O N E SEATTLE F A U L T ZONE D A B O B B A Y F A U L T Z O N E D A B O B B A Y F A U L T Z O N E KINGST O N A R C H PORT LUDLOW UPLIFT S O U T H E R N W H I D B E Y S O U T H E R N W H I D B E Y I S L A N D F A U L T Z O N E I S L A N D F A U L T Z O N E Holly Bremerton Bainbridge IslandSilverdale Poulsbo Hansville Quilcene Kingston Eglon Dy e s I n l e t Li b e r t y B a y Port Madison Port Madison P U G E T S O U N D SEATTLE BASIN SEATTLE UPLIFT Seabeck Brinnon Dabob BayD i s c o very BayVI NL A ND S Y N C LI N E QUILCENE QUADRANGLE Winslow Port Gamble Port Ludlow Bangor Port OrchardBoltonPeninsulaToandos PeninsulaOLY M P I C – W A L L O W A L I N E A M E N T Pulali Point Mount Walker BO N J O N P A S S BO N JO N P AS S FA U L T Z O N E FAUL T Z O N E Dose w a l l i p s R i v e r O L Y MPI C – W ALLO WA LINEAMENT HOOD CANALFigure M1. Colored relief map of regional structure surrounding the Quilcene 7.5-minute quadrangle (outlined in red). Faults in and adjacent to the quadrangle (dashed lines) are shown by current field investigations (Contreras and others, 2014; Polenz and others, 2014). Regional faults (dashed lines) are redrawn from previous investigations (Blakely and others, 2009; Tabor and others, 2011; Lamb and others, 2012; Bowman and Czajkowski, 2013; Contreras and others, 2013; Polenz and others, 2013). Segments of the Olympic–Wallowa lineament (blue line) are drawn from descriptions by Raisz (1945) and faulting noted by Tabor and others (2011). Geophysical studies (Pratt and others, 1997) provided the information on the uplifts and basins (outlined by green dashes). Table M1. Age-control data within the Quilcene 7.5-minute quadrangle. Analytical methods used are 14C, radiocarbon analysis; AMS, radiocarbon analysis by atomic mass spectrometry; OSL, optically stimulated luminescence; and IRSL, infrared stimulated luminescence. Radiocarbon age estimates are presented as ‘conventional radiocarbon age’ with quoted errors representing one relative standard deviation (68% probability). Radiocarbon age estimates stated in ka are in calendar years before 1950 divided by 1,000 and are reported with two standard deviations of uncertainty (2σ = 95% confidence interval) as calculated using Calib online (http://calib.qub.ac.uk/calib/). OSL and IRSL ages are in ka and reported with one standard deviation of uncertainty (1σ = 68% confidence interval). Uncertainty estimates reflect random and lab errors; errors from unrecognized sample characteristics or flawed methodological assumptions are unknown. Elevations are estimated using Puget Sound Lidar Consortium lidar grid elevations projected to State Plane South, NAD 83 HARN, supplemented by elevation estimates of bluffs. Site no. Analytical method Age estimate (14C yr BP or ka) 13C/12C (o/oo) Material dated Geologic unit Lab no. Elev. (ft) Site location Notes GD1 fossils6 sample yielded no stratigraphic constraint – – microfossils Em2t 8-A-696 365 sec. 5, T27N R1W bedrock sample for biostratigraphic analysis GD2 OSL3 72.980 ±3.51 ka – – quartz sand Qcw Quilcene-2 295 sec. 3, T27N R1W OSL sample of quartz grains from unit Qcw GD3 IRSL3 113.590 ±6.91 ka – – feldspar grains Qcw Quilcene-2 295 sec. 3, T27N R1W IRSL sample of feldspar grains from unit Qcw GD4 fossils6 sample yielded no stratigraphic constraint – – microfossils Em2ss 18-A-865-B 340 sec. 7, T27N R1W bedrock sample for biostratigraphic analysis GD5 fossils6 sample yielded no stratigraphic constraint – – microfossils Em2t 38-A-1128 320 sec. 9, T27N R1W bedrock sample for biostratigraphic analysis GD6 OSL3 27.960 ±1.74 ka – – quartz sand Qco Quilcene-3 455 sec. 17, T27N R1W OSL sample of quartz grains from unit Qco GD7 IRSL3 36.640 ±2.98 ka – – feldspar grains Qco Quilcene-3 455 sec. 17, T27N R1W IRSL sample of feldspar grains from unit Qco GD8 fossils6 sample yielded no stratigraphic constraint – – microfossils Em2ss 8-A-702 570 sec. 13, T27N R2W bedrock sample for biostratigraphic analysis GD9 AMS1 >45 ka4 -25.2 organics Qcw D-AMS 003731 176 sec. 28, T27N R1W organics in paleosol GD10 AMS1 49,053 ±470 yr BP5 -47.6 peat Qco D-AMS 003733 160 sec. 30, T27N R1W peat layer in non- glacial gravel deposit GD11 AMS1 113 ±31 yr BP 0.269–0.012 ka -18.0 wood Qls D-AMS 004467 11 sec. 36, T27N R2W tilted stump, partially buried by landslide GD12 fossils6 sample yielded no stratigraphic constraint – – microfossils Em2a 29-A-992 20 sec. 36, T27N R2W bedrock sample for biostratigraphic analysis GD13 fossils6 late Eocene– early Miocene – – fossil Em2a 29-A-993 20 sec. 36, T27N R2W late Eocene-early Miocene nautilus fossil Aturia angustata GD14 tephra2 100–200 ka – – tephra Qcw 9-660-C 240 sec. 32, T27N R1W Lindsays Beach tephra (Birdseye 1976b), correlated with the Carp Lake tephras. See Appendix E for microprobe data GD15 AMS1 370 ±24 yr BP 0.500–0.319 ka -25.9 wood Qls D-AMS 003734 8 sec. 31, T27N R1W cedar roots in growth position, partially buried by possible landslide GD16 fossils6 sample yielded no stratigraphic constraint – – microfossils Em2a 26-A-955-A 20 sec. 36, T27N R2W bedrock sample for biostratigraphic analysis GD17 AMS1 >45 ka4 -30.3 organics Qcw D-AMS 003732 25 sec. 6, T26N R1W organics from silt and sand in beach bluff GD18 OSL3 22.000 ±2.30 ka – – quartz sand Qco Quilcene-1 420 sec. 3, T26N R1W OSL sample of quartz grains from unit Qco GD19 IRSL3 26.420 ±2.13 ka – – feldspar grains Qco Quilcene-1 420 sec. 3, T26N R1W IRSL sample of feldspar grains from unit Qco GD20 AMS1 >45 ka4 -28.5 organics Qcw D-AMS 004601 10 sec. 10, T26N R1W organics in non-glacial silt deposit 1 Analysis by DirectAMS 2 Geochemical tephra analysis by Franklin Foit, Washington State University 3 Analysis by Shannon Mahan, USGS 4 Fraction of modern carbon was not discernible from background; samples are assumed to be older than 45 ka. 5 Radiocarbon calibrations for samples greater than 45 ka are not supported by the Calib program. 6 Analysis by Elizabeth Nesbitt, Burke Museum of Natural History Table M2. List of well sites for the Quilcene 7.5-minute quadrangle. Washington State Department of Ecology well tags shown when available; otherwise Ecology’s internal tracking number shown. This unique identifier is assigned to each well log as it is recorded into their database. These data were obtained at: https://fortress. wa.gov/ecy/waterresources/map/WCLSWebMap/default.aspx Well site Site location Site information W1 sec. 6, T27N R1W well tag BBN266 W2 sec. 5, T27N R1W well tag APM087 W3 sec. 6, T27N R1W internal no. 47658 W4 sec. 4, T27N R1W internal no. 49684 W5 sec. 4, T27N R1W well tag AKA942 W6 sec. 4, T27N R1W well tag ABC600 W7 sec. 4, T27N R1W well tag AKA941 W8 sec. 10, T27N R1W well tag ALS030 W9 sec. 10, T27N R1W well tag AAC142 W10 sec. 10, T27N R1W well tag ACD378 W11 sec. 10, T27N R1W well tag AEK724 W12 sec. 15, T27N R1W well tag ABW243 W13 sec. 18, T27N R1W well tag AKA906 W14 sec. 18, T27N R1W well tag BCS267 W15 sec. 15, T27N R1W well tag ABC305 W16 sec. 18, T27N R1W well tag ABB981 W17 sec. 15, T27N R1W internal no. 45796 W18 sec. 15, T27N R1W well tag AFC250 W19 sec. 24, T27N R2W internal no. 276825 W20 sec. 20, T27N R1W well tag AES388 W21 sec. 22, T27N R1W well tag AHB457 W22 sec. 20, T27N R1W internal no. 52421 W23 sec. 22, T27N R1W well tag BBB314 W24 sec. 24, T27N R2W internal number 44634 W25 sec. 20, T27N R1W well tag AHB477 W26 sec. 24, T27N R2W well tag AKA933 W27 sec. 24, T27N R2W well tag AKA981 W28 sec. 22, T27N R1W well tag ALS046 W29 sec. 22, T27N R1W well tag ACW035 W30 sec. 22, T27N R1W well tag AKS820 W31 sec. 27, T27N R1W well tag AAB949 W32 sec. 27, T27N R1W internal no. 44389 W33 sec. 29, T27N R1W well tag BBP671 W34 sec. 25, T27N R2W internal no. 276393 W35 sec. 29, T27N R1W internal no. 48970 W36 sec. 28, T27N R1W internal no. 49864 W37 sec. 29, T27N R1W internal no. 48451 W38 sec. 25, T27N R2W well tag AAB848 W39 sec. 29, T27N R1W well tag ABE811 W40 sec. 31, T27N R1W internal no. 52223 W41 sec. 36, T27N R1W well tag AHH178 W42 sec. 35, T27N R1W well tag AGS203 W43 sec. 31, T27N R1W well tag ABP913 W44 sec. 35, T27N R1W well tag AHL410 W45 sec. 36, T27N R1W well tag ABZ693 W46 sec. 31, T27N R1W well tag AKA937 W47 sec. 35, T27N R1W internal no. 583881 W48 sec. 36, T27N R1W well tag ABP935 W49 sec. 31, T27N R1W well tag AEJ752 W50 sec. 32, T27N R1W well tag ABC155 W51 sec. 32, T27N R1W well tag AFB553 W52 sec. 32, T27N R1W well tag AEE041 W53 sec. 34, T27N R1W well tag ACQ531 W54 sec. 31, T27N R1W internal no. 52306 W55 sec. 32, T27N R1W well tag AAC526 W56 sec. 34, T27N R1W well tag ACQ532 W57 sec. 34, T27N R1W well tag ALK367 W58 sec. 34, T27N R1W well tag AGS268 W59 sec. 6, T26N R1W well tag APQ292 W60 sec. 6, T26N R1W well tag ABP738 W61 sec. 36, T27N R1W internal no. 48805 W62 sec. 10, T26N R1W well tag ABC313 W63 sec. 7, T26N R1W well tag ABZ503 W64 sec. 10, T26N R1W internal no. 51542 W65 sec. 7, T26N R1W well tag ABC169 W66 sec. 7, T26N R1W internal no. 277062 W67 sec. 7, T26N R1W internal no. 28813 W68 sec. 7, T26N R1W well tag AAB798 W69 sec. 10, T26N R1W well tag AKS804 W70 sec. 7, T26N R1W internal no. 46271 W71 sec. 7, T26N R1W internal no. 43840 W72 sec. 7, T26N R1W internal no. 45097 Figure M2. Comparison of geologic time scale, global magnetic polarity, Marine Oxygen Isotope Stages (MIS), and ages of climatic intervals in the Puget and Fraser Lowlands. Age ranges for the Olympia nonglacial interval, Vashon Stade, and Everson interstade were modified by Polenz and others (2013, 2012b). We note that the time boundaries between the Olympia nonglacial interval, Vashon Stade, and the Everson interstade in the Puget Lowland are time transgressive. Data sources are explained in Troost and Booth (2008). Figure modified from Troost and Booth (2008, fig. 6), BC, British Columbia. Possession glaciation (80–60 ka) Fraser glaciation (30–10 ka) Double Bluff glaciation (190–125 ka) Defiance glaciation (280–215 ka) NormalPolarity: Reversed Whidbey interglaciation (125–80 ka) Hamm Creek interglaciation (215–190 ka) Olympia nonglacial interval (60–19 ka)unidentified glacial and interglacial intervalsHolocene PleistoceneMiddleLateSubchron Polarity Age (ka) Lowland Climatic Intervalsδ18O (‰) 0 -1 -2 -3 BrunhesMatuyama Laschamp Blake Biwa I/Jamaica Biwa II/Levantine Biwa III Emperor Big Lost Delta Central Puget Lowland Stratigraphic Column MIS 5 6 2 3 4 7 9 11 13 15 17 19 21 0 100 200 300 400 500 600 700 800 Sumas stade (BC) (11.5–10 ka) Everson interstade (17–15.5 ka) Vashon stade (19–17 ka) Vashon Till Esperance Sand (advance outwash) Lawton Clay Port Moody interstade (BC) (23–21 ka) Coquitlam stade (BC) (30–25 ka) ? ? ? Qgic Qgo Qoa Qa QbQaf Qp QgogQgt ml Qpd Qls Qmw Qgoaf Qgdd Qgdp Qcw Qc Qco Qoaf Em2t Em2ss Em2a Em1c Evc UNCONFORMITY EOCENETERTIARYPLEISTOCENEQUATERNARYHOLOCENECORRELATION OF MAP UNITS NONGLACIAL UNITS GLACIAL UNITS FRASER GLACIATION POSSESSION GLACIATION WHIDBEY INTERGLACIAL DOUBLE BLUFF GLACIATION OLYMPIA NONGLACIAL INTERVAL ALDWELL FORMATION CRESCENT FORMATION ? ? SANDSTONE OF SNOW CREEK TOWNSEND SHALE ?? ? LYRE FORMATION TERTIARY SEDIMENTARY AND VOLCANIC ROCKS Townsend Shale (late Eocene)—Marine siltstone and sandstone; gray to brown; calcareous concretions and nodules of siderite are locally abundant. Sandstone of Snow Creek (late? Eocene)—Micaceous sandstone and sandy siltstone; gray-brown. Previously identified as the Snow Creek Member of the Lyre Formation (Spencer (1983b, 1984). Aldwell Formation (early to middle Eocene)—Lithic sandstone and siltstone; gray to gray-green; interfingering contact with sedimentary beds of the Crescent Formation. Ev(c) Crescent Formation (early to middle Eocene)—Basalt; dark gray to greenish black where fresh, weathers gray and yellow-brown; commonly fine-grained sills and flows; commonly includes amygdules of zeolite and chlorite-group minerals.RNT Sedimentary rock of the Crescent Formation (early to middle Eocene)—Lithic sandstone, basaltic conglomerate and basalt breccia; dark gray-black; interfingered with Crescent volcanics. GEOLOGIC SYMBOLS Contact—Solid where location accurate; long dash where approximate; short dash where inferred; queried where existence or location uncertain Normal fault—Location concealed Reverse fault—Long dash where location approximate; short dash where inferred; dotted where concealed; queried where existence or location uncertain Strike-slip fault, right-lateral offset—Solid where location accurate; long dash where location approximate; short dash where inferred; dotted where concealed; queried where existence or location uncertain Oblique-slip fault, reverse right-lateral offset—Short dash where location inferred; dotted where concealed; queried where existence or location uncertain Oblique-slip fault, normal right-lateral offset— Short dash where location inferred; dotted where concealed; queried where existence or location uncertain High-angle dip-slip fault—Location concealed; queried where existence or location uncertain; relative movement shown by U and D Anticline—Short dash where location inferred; dotted where concealed; queried where existence or location uncertain; arrow indicates plunge direction Syncline—Short dash where location inferred; dotted where concealed; queried where existence or location uncertain Topographic lineament—Solid where location accurate; long dash where approximate Cross section line Strand line (former shoreline)—Identity and existence certain Geophysical data collection line—Location accurate Landslide scarp—Solid where identity or existence certain; queried where identity or existence uncertain; hachures on downslope side Bedding—showing strike and dip Bedding in unconsolidated sedimentary deposits—showing strike and dip Dip of fault—showing dip direction Foreset bedding in unconsolidated sedimentary deposits—showing strike and dip Horizontal bedding Joint—showing strike and dip Minor anticline—showing bearing and plunge Minor syncline—showing bearing and plunge Minor fault—showing strike and dip Minor vertical fault—showing strike and dip Slickenline—showing bearing and plunge Geologic unit too small to show as a polygon at map scale Age sample, radiocarbon (14C) Age sample, luminescence Age sample, fossil Water well Significant site Location of photograph Geophysical data collection location MAJOR FINDINGS • The right-lateral Dabob Bay and Bon Jon Pass fault zones connect in a right step-over and create a pull-apart basin at Quilcene and the Bolton Peninsula. This step-over occurs near locations associated with the Olympic–Wallowa lineament. • Deformed Quaternary deposits on the Bolton Peninsula suggest potentially active structures along or near the Olympic–Wallowa lineament where previous work by J Harlen Bretz and Robert J. Carson noted deformation. • The Dabob Bay fault zone has deformed and juxtaposed portions of Crescent Formation, Aldwell Formation, and Townsend Shale between Fishermans Point on the Bolton Peninsula and Mount Walker. Seismicity in the area suggests these structures may be active. • Native stories, as well as scarps and trees buried by landslide deposits near Frenchmans Point, may record a historic earthquake. • Sedimentary bedrock at Fishermans Point contains evidence of fossil methane seeps in the Townsend Shale. DESCRIPTION OF MAP UNITS (See pamphlet for complete descriptions of map units) Quaternary Unconsolidated Deposits HOLOCENE NONGLACIAL DEPOSITS Modified land—Clay to boulder gravel and diamicton; locally derived but mixed and reworked by excavation and (or) redistribution that notably modifies topography. Alluvium—Sand to cobble gravel; loose; gray, generally unweathered; clasts subrounded; moderately to well sorted. Relict alluvium—Sand to cobble gravel; loose; gray; clasts subrounded; moderately to well sorted; commonly found in abandoned terraces. Beach deposits—Sand to boulder gravel with shells and driftwood; loose; gray to brown-gray; clasts moderately to well rounded; may be well sorted; derived from shore bluffs, streams, and underlying deposits. HOLOCENE TO LATEST PLEISTOCENE NONGLACIAL DEPOSITS Peat—Organic-rich sediment, including silt and clay; very soft to medium soft; dark brown to black; typically in closed depressions. Landslide deposits—Diamicton; loose or soft; clasts subangular to subrounded; unsorted to moderately sorted; nonstratified. Not all landslides are shown, and absence of a mapped slide does not imply absence of hazard. Queried where there was some level of uncertainty about the identity of the landform. Mass-wasting deposits—Diamicton; loose; clasts subrounded; unsorted to poorly sorted; includes colluvium, debris fans, alluvial fans, and landslides; mapped where topography suggests mass-wasting deposits. Alluvial fan deposits—Debris-flow diamicton and alluvial sand and gravel; loose; gray; clasts subrounded to rounded; forms concentric lobes where streams emerge from confining valleys. Relict alluvial fan deposits—Debris-flow diamicton and alluvial sand and gravel; loose; gray; clasts subrounded to rounded; found in inactive alluvial fans that lack evidence for recent sediment delivery. PLEISTOCENE GLACIAL AND NONGLACIAL DEPOSITS Vashon Drift of the Fraser Glaciation (MIS 2) Vashon recessional outwash—Sand and cobble to pebble gravel; loose; gray, weathering to tan; clasts subangular to rounded; moderately to well sorted; represents fluvial deposition by Vashon meltwater. Locally divided into: Vashon alluvial fan deposits—Sand and pebble gravel, silt, and cobbles; loose; subrounded; moderately to poorly sorted; stratified; forms concentric lobes where outwash streams emerged from confining valleys. Vashon recessional outwash gravel—Pebble and cobble gravel and sand; gray to tan, unweathered; loose; clasts moderately to well rounded; moderately to well sorted; mapped in outwash channels graded to a recessional lake. Vashon ice-contact deposits—Diamicton, cobbly pebble gravel, and subglacial melt-out till; yellow-tan to gray; loose to dense; clasts subangular to subrounded; variously sorted; massive to well stratified; till is friable and permeable. Vashon lodgment till—Mixture of clay, silt, sand, and gravel (diamicton); gray; compact; clasts subangular to rounded; unsorted and unstratified. Pre-Fraser Glacial and Nonglacial Deposits Olympia nonglacial deposits—Sand, silt, and pebble gravel; tan and gray; loose to moderately compact; clasts subangular to subrounded; well sorted; massive to well bedded and stratified; locally crossbedded. Represents distal Olympic and Cascade alpine outwash deposited in the Puget Lowland when it was ice free. Deposited during the Olympia nonglacial interval (MIS 3). Possession Drift—Diamicton and outwash; light brown to gray; very dense and massive; clasts subrounded to rounded; moderately to well sorted and unsorted; moderately stratified and medium to thickly bedded. Deposited during the Possession Glaciation (MIS 4). Whidbey Formation—Silt, clay, and sand with minor sandy pebble gravel; light gray; dense and stiff; clasts subrounded; well stratified and well sorted; thinly laminated to very thickly bedded. Represents mostly calm-water deposition during the Whidbey Interglaciation (MIS 5). Double Bluff Drift—Diamicton; gray to blue gray; very dense. The few wells that penetrated this unit encountered diamicton suggestive of significant glacial strata. Deposited during the Double Bluff Glaciation (MIS 6). Pre-Fraser deposits, undivided Pre-Fraser nonglacial deposits—Predominantly silty clay, sand, and gravel of uncertain age; brown-gray and blue-gray; very dense and hard. Pre-Fraser glacial drift—Till and minor sandy pebble to cobble gravel of uncertain age; gray; compact; clasts subangular to subrounded; moderately sorted and stratified to unsorted and unstratified. The unit may reflect multiple glacial advances. 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This product is considered to be exempt from the Geologist Licensing Act [RCW 18.220.190 (4)] because it is geological research conducted by or for the State of Washington, Department of Natural Resources, Division of Geology and Earth Resources. © 2014 Washington Division of Geology and Earth Resources Lambert conformal conic projection North American Datum of 1927; to place on North American Datum of 1983, move the projection lines approximately 20 meters north and 96 meters east as shown by crosshair corner ticks Base map from scanned and rectified U.S. Geological Survey Quilcene 7.5-minute quadrangle, 1953 Shaded relief generated from a lidar bare-earth digital elevation model (available from Puget Sound Lidar Consortium, http://pugetsoundlidar.ess.washington.edu/); sun azimuth 340°; sun angle 60°; vertical exaggeration 0.8 GIS by Trevor A. Contreras and Annette I. Patton Digital cartography by Ian J. Hubert and Anne C. Olson Editing and production by Jaretta M. Roloff, Jessica L. Czajkowski, and Alexander N. Steely This geologic map was funded in part by the U.S. Geological Survey National Cooperative Geologic Mapping Program. depth contours in feet—datum is mean lower low water 7000 FEET1000 10000 2000 3000 4000 5000 6000 0.5 1 KILOMETER10 0.51 0 1 MILE SCALE 1:24,000 contour interval 20 feet APPROXIMATE MEAN DECLINATION, 2014 MAGNETIC NORTHTRUE NORTH16½° http://www.dnr.wa.gov/geology/ 101 104 3 POULSBOBRINNONCENTERLOFALLMT WALKERSEABECKPORT LUDLOWUNCASQUILCENEQuilcene Poulsbo Brinnon Port Ludlow KITSAP CO. JEFFERSON CO. Geologic Map of the Quilcene 7.5-minute Quadrangle, Jefferson County, Washington by Trevor A. Contreras, Annette I. Patton, Gabriel Legorreta Paulín, Ian J. Hubert, Recep Cakir, and Robert J. Carson 2014 WASHINGTON DIVISION OF GEOLOGY AND EARTH RESOURCES MAP SERIES 2014-03 Quilcene 7.5-minute Quadrangle Pamphlet accompanies map Research supported by the U.S. Geological Survey, National Cooperative Geologic Mapping Program, under USGS award number G13AC00173. The views and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing the official policies, either expressed or implied, of the U.S. Government. AA′ W57 8 GD9 HVSR5 GD13 21 52 0 84 62 51 Qgdp P1 GD2 ? ? D U ? ? ? ?? ? S8 20 Seismic line 80 ? ? ? 16 Qco Qgic Qgog Qls Em1c Evc Qc Qcw Qgdd Qgdp Qp ml Qa Qaf Qb Qgo Qgoaf Qgt Qmw Qoa Qoaf Qpd Em2ss Em2t Em2a