ࡱ> lnks V"jbjb %kkV]jjjjj$jNNNNNN> ,NN NNN : NN646  B Y'jj :Stratigraphic Column for Sunset National Monument, Arizona by: Cara Schiek, 2001 EraPeriodEpochGroupFormationMemberSymbolLithologyCenozoicQuaternaryHolocene AlluviumQarSand, silt, and clay with minor interbedded gravelBasalt of Sunset CraterQbsTime of eruption determined from Stratigraphic, dendrochronologic, and paleomagnetic data was approximately A.D. 1065-1250Basaltic Cinder and Ash Blanket from eruption of Sunset CraterQcsShown only where underlying unit cannot be seen or interpreted from topographyHolocene/PleistoceneSilt, Sand, Gravel, and BouldersQalIncludes alluvium, colluvium, and eolian, glacial, and glaciofluvial depositsEolian DepositsQeSand, well-sorted. Forms extensive sand sheet Playa DepositQpSilt and clay, thinly stratified on flat floor of shallow, undrained desert lake basinLandslide DepositQlUnsorted rock bedris, ranging in diameter from less than 0.1-10 m. commly occurring as large slump blocksPleistoceneAlluvialQaeGravel and sand QafmSilt, clay, and sand deposited as valley fill upstream from Grand Falls. Valley fill resulted from damming of the little Colorado River by basalt flow from the Merriam Crater areaQadGravelly sand and interbedded sand and silt, locally with large blocks of limestone derived from Permian Kaibab FormationQacSilt, clay, and sand with several thin interbedded pebbly gravelsQaaGravelly sand with interbedded sand and siltGravel at Deadman WashQdgGravel, pebble-to boulder-size, rounded to subrounded, with interbedded sand; clasts of silicic, intermediate, and mafic rocks derived form San Francisco MountainBasalt of Merriam AgeQbmDated to 150,000 years old or lessBasaltic cinder and Ash Blanket from Vent of Merriam Age QcmShown only where underlying unit cannot be seen or interpreted from topographyBasalt of Pre-merriam AgeQbFlow is undissected and lies close to level of present drainageBasaltic Andesite of Pre-merriam AgeQbaAndesite of basaltic texture; commonly contains sieved plagioclase, augite, and olivine in partly glassy groundmass. Quartz, amphibole, or hypersthene may be presentBasalt of Pre-merriam age and within the Brunhes Epoch QbyNormal polarity and less than approximately 0.7 m.y..Basalt of Pre-Brunhes AgeQboNormal or reversed polarity and between approximately 0.7 and 1.8 m.y. old. Rhyolite Flow or DomeQrLocally with marginal rhyolite breccia or pumiceRhyolite Pyroclastic DeppositQrpPredominatly air-fall deposits on northeast side of San Franciso MountainTertiary/QuaternaryPleistocene/PlioceneAndesite Flow, Flow Breccia, or Tuff Flow QTanAssociated with San Francisco Mountain stratavolcanoAlluviumQTaInterbedded sand, silt, and clay with some interbeddedn gravelTertiaryPlioceneTaSand, silt, clay, deposits with some interbedded gravelBasaltTbyGenerally smooth, alluvial-covered flows with dissected marginsBasaltic Tuff and Tuff BrecciaTtbDeposits of cinders, hydrated basaltic glass, and accessory and accidental xenoliths Oldest Basalts of San Fransico Volcanic FieldTboRim BasaltsPliocene/ MioceneBidahochi FormationUpper MemberTbuSandstone, weakly consolidated, mostly fluvial in originLower memberTblCalcareous mudstone, siltstone, sandstone, and minor rhyolitic ash. Mostly lacustrine in originVolcanic vent deposit TbvIncludes tuff breccia, agglomerate, and lacustrine deposits in marr craters. Lava flows may cover vents and other deposits. Age ranges from approximately 8.5 to 4.2 m.y.Monchiquite lava flowTbfAlkalic lamprophyre containing clinopyroxene, olivine, biotite, and analcite. Extends beyond its source, in some cases as much as several kilometers. Ages are 7-6 m.y.Dike or neckTiMonchiquite similar to lava flows; commonly includes tuff breccia. Age range is same as for vent depositsBedded monchiquite tuffTtMostly lacustrine or air-fall in origin; may extend several kilometers from the eruptive sourceMioceneSandstone and GravelTgWeakly consolidated interbedded sand and gravelMesozoicCretaceousUpperMesaverde GroupWepo FormationKwAlternating beds of olive-gray siltstone, coal, and yellowish-gray sandstoneToreva FormationUpper Sandstone MemberKtuYellowish-gray to grayish-orange-pink, fine grained sandstoneMiddle carbonaceous mudstone memberKtmVariegated mudstoneLower Sandstone MemberKtlLight-brown to pale-yellowish-gray, fine to medium grained sandstoneTogue of Toreva FormationKtltSandstone intertongues with Mancos ShaleMancos ShaleKmLight to dark-gray claystone and siltstoneUpper TongueKmtLight to dark-gray claystone and siltstoneDakota SandstoneKdTan, brown, and gray sandstone, conglomeratic sandstone, and conglomerateJurassicMiddleCow Springs SandstoneJcsGreenish-gray to light yellowish- gray, fine to medium-grained, cross-stratified sandstoneEntrada Sandstone and Carmel SandstoneJecReddish-brown siltstone and sandstone, and white cross-stratified sandstoneLowerNavajo SandstoneJTrnGrayish-orange-pink, even-grained, thickly cross-stratified sandstoneTriassicUpperKayenta FormationTrktSilty facies, grayish-red mudstone, siltstone, and siltysandstoneMoenave FormationDinosaur Canyon Sandstone MemberTrmodOrangish-red, cross-stratified and flat-bedded sandstone and sandy siltstoneWingate SandstoneLukachukai MemberTrwlReddish-brown fine-grained, cross-stratified sandstoneRock Point MemberTrwrReddish-brown siltstone and mudstoneChinle FormationOwl Rock MemberTrcoMottled light-gray and grayish-pink interbedded limestone and calcareous siltstonePetrified forest MemberTrcpClaystone, siltstone, and minor sandstone, variegratedShinarump MemberTrcsLight-gray to yellowish-gray sandstone and conglomerateMiddle/LowerMoenkopi FormationTrmReddish-brown mudstone, siltstone, silty sandstone, and sandstoneTriassic and Paleozoic Sedimentary Rocks, UndividedTrPzuSandstone, shale, Silstone, limestone, dolomitic limestone, and dolomitePaleozoicPermianUpperPaleozoic Sedimentary rocks, undividedPzuSandstone, shale, siltstone, limestone, dolomitic limestone, and dolomiteLowerKaibab FormationPkYellowish-gray to light-gray silty dolomite, dolmitic sandstone, minor sandstone, dolomitic limestone.Toroweap Formation and Coconin SandstonePtcLight-colored, cross-stratified sandstone; facies of siltstone, sandstone, and dolomiteHermit ShalePPhsReddish shale and interbedded sandstone and shalePermian/PennslyvanianLowerSupai FormationReddish siltstone, cross-stratified; some limestone in the lower partMississppianLower/UpperRedwall LimestoneMDrtMassive light-gray limestone and dolomiteDevonianMiddle/ UpperTemple Butte LimestoneDolomite, reddish siltstone, sandy limestone, and gray sandstoneCambrianMiddle Tonto GroupMuav LimestoneCmbt Mottled-gray and purple dolomitic limestone. Lower part of Mauv intertongues with upper part of Bright AngleBright Angle ShaleMainly green, purple, and reddish-brown siltstone interbedded with light-brown sandstonein the lower partTapeats SandstoneMedium- to coarse-grained sandstone and pebble conglomerate, commonly crossbedded Reference: Map Showing Geology, Structure, and Uranium Deposits of the Flagstaff, 1x 2 degree Quadrangle, Arizona; 1984; G.E. Ulrich, G.H. Billingsley, Richard Hereford, E.W. Wolfe, L.D. Nealey, and R.L. Sutton; USGS Map I-1446; scale 1:250,000. R,/CEfgpu$)*+j o p q 5 6   : ? Y Z  np CJOJQJbQRV]cisz$qq$o$$lִFp@ ,B 3**$QRV]cisz]!^!U"V"                $$$qq$t$$$q$$l4ִFp@ ,B 3ll*l*`` ,-./DE`4}$qq$$$$q$$l4ִFp@ ,B 3   Efgk$q$$l4ִFp@ ,B 3  l*  $$$ pqrstu$$$q$$l4ִFp@ ,B 3   $}}$qq$q$$l4ִFp@ ,B 3   $$$ $%&'()*+0$$$q$$l4ִFp@ ,B 3  l* l  j k l m n o p 4$$$q$$l4ִFp@ ,B 3  p q u q$$l4ִFp@ ,B 3  $$$  q$$l4ִFp@ ,B 3   $$$ 5 6 : L$$$q$$l4ִFp@ ,B 3       Xq$$l4ִFp@ ,B 3   $$$  : ; < = > ? 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