DEPARTMENTOFENVIRONMENTALQUALITY NORTHCAROLINAGEOLOGICALSURVEYKENNETHB.TAYLOR,STATEGEOLOGIST OPENFILEREPORT2016-03
DESCRIPTIONOFMAPUNITS
Pre-MesozoiccrystalinerocksintheeasternApexQuadranglerepresentsomeoftheeasternmostexposuresoftheLateProterozoictoCambrianCarolinaterrane,togetherwithasmalportionoftheLateProterozoicCrabtreeterranetotheeast.Triassic sedimentaryrocksoftheDurhamsub-basinoftheDeepRiverMesozoicriftbasinunderliethewesternportionoftheApexQuadrangle.UnitdescriptionscommontoBlakeandClark(2016),andBlake(2008)fromtheCaryandRaleighWestgeologic maps,respectively,areusedand/oradaptedforconformitywithon-strikeunits.
VolcanogenicunitsoftheeasternmostportionoftheCarolinaterrane(CarysequenceofParker(1979);CaryformationofFarrar(1985a)andHibbardetal.(2002)havebeenmetamorphosedtothechloriteandbiotitezonesoftheuppergreenschistfaciesduringlatePaleozoiccontractionaltectonothermalactivityandearlyMesozoicextension.TheCrabtreeterraneexperiencedamphibolitefaciesmetamorphism.Mesozoicsedimentary,intrusive,andcataclasticrocksareunmetamorphosed.Despitethe effectsofdeformationandmetamorphism,LateProterozoictoCambrianvolcanogenicrocksoftheCarolinaterraneintheApexQuadrangletypicalypreserverelictplutonicandvolcanicigneoustextures,orsedimentarytextures,alowingforprotolithidentification.Inotherexposures,partitionedhighstrainhasresultedinmylonitic,ultramylonitic,andphyloniticrockswhoseprotolithsaredifficulttodiscern.
MetaigneousrocksinbothterranesareclassifiedandnamedusingthenomenclatureoftheInternationalUnionofGeologicalSciences(IUGS)subcommissiononthesystematicsofigneousrocksafterLeMaitre(202).Relictigneoustextures,modal mineralassemblages,ornormalizedmineralassemblageswhenwhole-rockgeochemicaldataareavailable,providethebasisfornamingmetaigneouslithodemes.ApreliminarylithodemicdesignationisdevelopedherefolowingArticles31-42oftheN orthAmericanStratigraphicCode.Theserockunits,whichlackgeochronologicdataandstratigraphicfacingdirections,warrantsuchadesignation.PreviousgeologicmapsandlithologicdescriptionscoveringtheApexQuadrangle[Parker(1979);Farrar(1985a,b)]assistedinthedevelopmentofthecurrentmappingresults.DetaileddescriptionsofsomelithodemicunitsarereportedinBlake(194),StoddardandBlake(1994),andBlakeetal.(2001).
TriassicsedimentaryrocksoftheApexQuadranglearepartoftheChathamGroupoftheN ewarkSupergroup(WeemsandOlsen,1997)andoccurintheeast-centralportionoftheDurhamsub-basin,acomponentbasinoftheDeepRiverMesozoicriftbasin.DetaileddescriptionsofTriassicsedimentaryunitsarereportedinHoffmanandGalager(1989)andClarketal.(2001).Duetotheinterfingeringnatureofthesesedimentsandthelackofdistinctmarkerbeds,lithofaciesmappingwasutilizedto grouptherocksintomappableunits.HoffmanandGalagher(1989)identifieddistinctlithofaciesintheDurhamsub-basin.Theselithofaciesweregroupedinthreelithofaciesassociations,identifiedasLithofaciesAssociationI(LAI),LithofaciesAssociationI(LAI),andLithofaciesassociationI(LAI).IngeneralLAIcontainsinterbeddedsandstoneandsiltstoneandisinterpretedasbraidedstreamdeposits.LAIalsocontainsinterbeddedsandstoneandsiltstone,butisinterpretedasa meanderingfluvialsystemsurroundedbyvegetatedfloodplain.LAIcontainspoorlysortedsandstone,pebblysandstone,andconglomerate.LAIisinterpretedasaluvialfancomplexescharacterizedbybroad,shalowchannelswithhighsediment concentrations,andlocaly,high-energydebrisflows.LAIlithologiesarenotpresentinthemaparea.
SEDIMEN TARYUN ITS
Qal�alluvium:Tantolightgray,unconsolidated,poorlysortedandpoorlystratifieddepositsofangulartosubroundedgravel,sand,silt,andclayinstreamdrainages.Includespointbars,terraces,andnaturalleveesalonglargerQal creekfloodplains.Structuralmeasurementsrepresentcrystalinebasementinliers,toosmaltomapseparately,thataresurroundedbyaluvium.
Tphms-UppermostTertiaryCoastalPlainUnit:sand,siltysandandclayeysand;reddishbrown,tan,andgray;fine-tovery-coarsegrained;poortomoderatelypoorsorting;subangulartoroundedquartzsand.ContainsrareheavyTphms minerals(dominantlyasuitewithstaurolite,draviteandrutile);raremica;rarerosequartz.Massivelybedded,rarelylaminated.N earsurfacemotlingtypicalyobscuressedimentarystructures.Basalcontactiserosional.Unitisof probablePlioceneage.
SchmidtEqualAreaStereogramDataofContouredPolestoBeddinginTriassicSedimentaryUnits
Tpfms�LowermostTertiaryCoastalPlainUnit:sand,siltysandandclayeysand;white,yelow,tan;unitiscomposedoftwodistinctlithofacies�theupperlithofaciesischaracterizedasvery-finetomedium-grained,welto
ContourInterval=2N=51 Tpfms moderatelywelsorted,angulartosubangularquartzsand.Containsrareheavyminerals(dominantlyasuitewithstaurolite,hematite,dravite,andrutile),tracetominormica,andrarerosequartz.Sedimentarystructuresinclude:laminations,cross-bedding,andflaserbedding.Thisupperlithofaciescontainsdistinctbedsofwhitetolightgray,massivesandyclayandisupto32feetthickinthemaparea.Thelowerlithofaciesischaracterizedasslightlymuddy,coarse-toverycoarse-grained,weltomoderatelywelsorted,angulartosubangularquartzsand.Containsrareheavyminerals,(dominantlyasuitewithstaurolite,dravite,andrutile);tracemica;rarerosequartz.Thislowerlithofaciesisdistinctlybedded,andcontainsbedsofwhitetolightgraysandyclayandwel-sortedmedium-grainedsand.Thislithofaciesisupto13feetthickinthemaparea.UnitisofprobablePlioceneage.
Ku-Cretaceousdeposits,undivided:sand,siltysandandclayeysand;lightgray,gray,andtan,fine-tocoarse-grained;moderatelyweltopoorlysorted,angulartosubangularquartzsand.Containsrareheavyminerals(dominantlyKu asuitewithstaurolite,dravite,andrutile);tracemica;rarerosequartz;traceofblackorganicmaterial.Thisunitisupto7feetthickinthemaparea.UnitisofprobableLateCretaceousage.
IGN EOUSUN IT
Jd�Diabase:Darkgreen-blacktogray-black,aphyrictolocalyplagioclasephyricdiabase,typicalyolivine-bearing.Weatherstotan-gray,spheroidalyrounded,densebouldersandcobblesorpunkycobblesandpebblesthatcanbeJd tracedalongstrikewhereoutcropisabsent.Redstationlocationsindicateisolatedoutcroporboulderfieldsofdiabase.
N EWARKSUPERGROUP,CHATHAMGROUP
Trcc Trc-conglomerate:reddish-browntodarkbrown,irregularlybedded,poorlysorted,cobbletoboulderconglomerate.Muscoviteisraretoabsentintheverycoarse-grainedtogravelymatrix.Anarbitrarycut-offofgreaterthan50percentconglomeratedistinguishesthisunitfromtheTrcs/cfacies.Clastsarechieflymiscelaneousfelsicandintermediatemetavolcanicrocks,quartz,epidote,bluish-grayquartzcrystaltuff,muscoviteschist,andraremeta-granitic material.Maximumclastdiametersareinexcessof2malongHaleysBrancheastoftheRDUairportintheCaryQuadrangle.
Trcs/c-sandstonewithinterbeddedconglomerate:reddish-browntodarkbrown,irregularlybedded,poorlysorted,coarse-grainedtopebbly,muddylithicsandstoneswithinterbeddedpebbletocobbleconglomerate.MuscoviteisTrcs/c raretoabsentinthematrix.Wel-definedconglomeratebedsdistinguishthisunitfromconglomeratebasallagsofTrcs.Anarbitrarycut-offoflessthan50percentconglomeratedistinguishesthisunitfromtheTrccconglomeratefacies.Conglomeratebedsarechannel-shapedandscourintotheunderlyingsandstonebeds.UnitgradeseastwardintoTrcc.
Trcs-interbeddedsandstoneandpebblysandstone:reddish-browntodarkbrown,irregularlybeddedtomassive,poorlytomoderatelysorted,medium-tocoarse-grained,muddylithicarkoses,withoccasional,matrix-supportedTrcs granulesandpebblesoras1-5cmthickbasallayers.Muscoviteiscommontoabsent.Occasionalbioturbationisusualysurroundedbygreenish-bluetograyreductionhalos.Bedsaretabular,1-3metersthick,withgoodlateral continuity.UnitgradeseastwardintoTrcs/c.
Trcs/si2-sandstonewithinterbeddedsiltstone:cyclicaldepositionalsequencesofwhitish-yelowtograyish-pinktopalered,coarse-toverycoarse-grained,troughcross-beddedlithicarkosethatfinesupwardthroughyelowtoTrcs/si2 reddish-brown,medium-tofine-grainedsandstone,toreddish-brown,burrowedandrootedsiltstone.Bioturbationisusualysurroundedbygreenish-bluetograyreductionhalos.Coarse-grainedportionscontainabundantmuscovite,andbasalgravellagsconsistofclastsofquartz,bluish-grayquartzcrystaltuff,andmudstonerip-ups.
FAU LTROCKS
Trsc�silicifiedcataclasite:tan,tan-brownandwhite,silicifiedcataclasite,commonlystainedwithhematiteorlimoniteand/ordisplayinghematite-filedfractures.OtherfracturesareinfiledwithidiomorphicquartzcrystalsorTrsc massivemilkyquartz.AngularclastsofTriassicsedimentaryunitsandthehighlysilicifiedandrelictfoliatedcrystalinerocks,includingtheColesBranchPhyliteandPotsBranchgreenstone,arecommonalongtheJonesboro normalfault.
METAMORPHICUN ITS
CAROLIN ATERRAN E
SchmidtEqualAreaStereogramDataofContouredPolestoRegionalFoliation(Srs) META-IGN EOUSUN ITSContourInterval=2N=320
CZrg�ReedyCreekmetagranodiorite:Leucocratic(CIlessthan10),lighttan-graywhite,bluish-graywhite,orpinkish-white,medium-grained,andlocalyporphyritic,with2-4mmbluequartzphenocrysts.BoulderfieldsCZrg andmassiveoutcropsarexenomorphictosubidiomorphicmetagranodioriteorfoliatedandlineated,protomylonitictomyloniticgranodioriticgneiss.Aggregatesofwhitemica,quartz,plagioclase,andalkalifeldsparhighlighta pervasiveminerallineation.Maycontainsubidiomorphicbiotiteplatesandisolatedclotsofepidoteandbiotite,andmaybewhitemica-richingneissiclayers.
CZsl�SunsetLakePluton:Leucocratic(CIlessthan5)metagranodioriteormetatonalite(metatrondhjemite)porphyry,beigewherefresh,distinctivelyporphyriticwithabundanteuhedralphenocrystsofsodicplagioclaseand
CZsl sparseroundishquartzinagroundmassthatisavermicularorgraphicintergrowthoffinefeldsparandquartz.Maycontaintracesofchlorite,epitdote,garnet,titanite,zirconandopaqueminerals.Chemicalanalysesofthree specimensrangefrom71.9to7.4wt%SiO2;withnormativeQ:A:Paveraging33:18:49,andnormativeAnaveraging7.1%.Texturesandmineralogyreflectlikelyhypabyssalsubvolcanicorigin.DescribedasquartzkeratophyrebyFarrar(1985a).WelexposedinthespilwayofSunsetLake,andalongseveralcreeksdrainingintoSunsetandBassLakes.
METAVOLCAN ICAN DMETASEDIMEN TARYU N ITS
CZcbp�ColesBranchphyllite:Tan-white-orangetodarksilverygray,fine-grained,welfoliatedandlocalylineated,mixedmaficandfelsiclithodeme.Dominantlyconsistsofwhitemicaphylite,localywithcompositional
CZcbp layering;layersofmesocraticwhitemica-chlorite-biotitephylitelocalycontainquartzandplagioclasephenocrysts.Otherlayersconsistofveryfinegrainedgreenstoneandchloritephylite.Localycarriesahigh-strainmylonitic and/orphyloniticoverprint,especialyadjacenttotheJonesboronormalfault,obscuringprimaryprotolithtexturesandcontactrelationships.Theserocksmaybevolcanicorvolcaniclasticbaseduponstructuralandlithodemic positionwithrespecttotheBigLake-RavenRockschist.SomelesssilicifiedclastsinTriassicsilicifiedcataclasiteareofthisphylite.
CZpbg�PotsBranchgreenstone:Melanocratictomesocratic(CIgreaterthan50),variablylightgreen,gray-greenanddarkblack-green,fine-tomedium-grainedrockscontainingchlorite,epidoteclinozoisite,albiteandCZpbg actinolite,withorwithoutquartz,biotite,titanite,whitemica,andopaqueminerals.Hasacrystaloblasticmatrixthatcontainsactinoliteand,localy,relictphenocrystsofplagioclase.Whereepidoteisabundant,theserocks arehardgreenstones,butwheresheetsilicatespredominatetheyarephylites.Biotitecommonlyalteredtovermiculite.WelexposedalongbluffsonthesouthsideofMiddleCreekeastofSunsetLakepluton.
CZbr3�BigLake-RavenRockschist:Lighttantoorange-brown,fine-tomedium-grained,whitemicaschist,phyliteandgneiss.Localypreservesprimaryvolcanictexture,eitherfragmentalorporphyritic.InferredtohaveCZbr3 adaciticvolcanicandorvolcaniclasticprotolith.LocalyincludesinterlayersofPotsBranchgreenstone.
CZbr2�BigLake-RavenRockschist:White-graytowhite-tantowhite,fine-tomedium-grained,welfoliatedandlocalylineated.Resistantoutcropsarecommonlywhitemicaschist,althoughcompositionallayerscontaining
CZbr2 biotiteandorchloritearepreserved.Localy,outcropscontainclastsincludingwhitetograyphyliteinferredtobemetamorphosedlapilitephraorfine-grainedvolcanicrocks,therebypreservingrelictfragmentalvolcanictextures.Otheroutcropscontainamixedassemblageofroundedclastsofmaficandfelsicvolcanicdetritusthatrangeupto20cminlength,reflectingavolcaniclasticprotolithpriortometamorphism.Localycutbymesoscalemaficdikes,typicalyalteredtovermiculite.LocalymayincludeinterlayersofPotsBranchgreenstone.
CZbr1�BigLake-RavenRockschist:White-graytowhite-tantowhite,fine-tomedium-grained,foliatedandlocalylineated.Rockledge-likeoutcropsofwhitemicaquartziticschistarecommonalongportionsofMiddleand
CZbr1 SwiftCreeksandtheirtributaries.Abundantresistant,relictphenocrystsofbluequartzandsodicplagioclaseupto3-5mmindiameterarewelpreserved.Localdomainsofwhitemicaphyliteorfine-grainedschistuptoseveral cminlengthmaybemetamorphosedlapiliclastsorrockfragments.Themode,porphyritictexture,andinferredrelictclastssuggestadaciticvolcanicand/orvolcaniclasticprotolithforthislithodeme,whichismappedbetweenUmsteadandRavenRockStateParks.MesoscaleandmacroscaleinterlayersofPotsBranchgreenstoneoccurwithinthefelsicschist.
CRABTREETERRAN E
META-PLUTON ICUN ITS
CZcg�CrabtreeCreekgneis:Leucocratic(CI=5-10),greenishsilver-gray,pink-gray,andtan-pink,medium-tocoarse-grained,andwelfoliatedandlineated,porphyroclasticgraniticorthogneiss.Plagioclase,microcline,
CZccg whitemica,biotite,andlocaltourmalineformagranoblasticandlepidioblasticmyloniticmatrixsurroundingupto1cmoblateandrod-shapedporphyroclasticquartzaggregates.Quartzshapesandwhitemicadefineapenetrative,subhorizontalL>Stectonitefabric(�pencilstructure�).Irregularlyshapedblocksandhorizonsofbiotiteamphiboliteareinferredtobeenclavesortransposedmaficdikes.WelexposedinanunnamedtributaryofMiddleCreekinthesoutheasterncorneroftheApexQuadrangle.ThisgneissdominatestheeasternportionoftheCrabtreeCreekplutonintheRaleighWestQuadrangle(seeBlake,1994).
SchmidtEqualAreaStereogramDataofContouredMineral,ElongationandStretchLineationsContourInterval=2N=37
METASEDIMEN TARYAN DMETAVOLCAN ICU N ITS
CZrcs�RichlandCreekschist:Silver-gray,white-gray,ortan-white,fine-tomedium-grained,compositionalylayered,andwelfoliated.Mixedmetasedimentarypeliticandmetavolcanic(?)felsiclithodemiclayersofschist,CZrcs phylonite,andfine-grainedgneiss.Whitemica,biotite,quartz,andfeldspardefinealepidioblasticandgranoblasticmatrixforlocalgarnet,staurolite,andtourmalineporphyroblasts,generalylessthan1cminsize.Elsewhere,containsthinlayersofwhitemicagarnetgraphiteschist.
REFEREN CES
Blake,D.E.,1994,IntrusiveanddeformationalrelationshipsoftheCrabtreeCreekplutoninwestRaleigh,inStoddard,E.F.andBlake,D.E.,eds.,GeologyandFieldTripGuide,WesternFlankofthe
RaleighMetamorphicBelt,N orthCarolina,Raleigh,N orthCarolinaGeologicalSurvey,CarolinaGeologicalSocietyGuidebookfor194,p.25-37.
Blake,D.E.,2008,GeologicmapoftheRaleighWest7.5-minutequadrangle,WakeCounty,N orthCarolina:GeologicMapGeologicMapSeries�15,N orthCarolinaGeologicalSurvey,scale1:24,00.
Blake,D.E.andClark,T.W.,2016,GeologicmapoftheCary7.5-minutequadrangle,WakeandDurhamCounties,N orthCarolina:N orthCarolinaGeologicalSurveyOpenFileReport2016-02,
scale1:24,000.
Blake,D.E.,Clark,T.W.,andHeler,M.J.,2001,AtemporalviewofterranesandstructuresintheeasternN orthCarolinaPiedmont,inHoffman,C.W.,ed.FieldTripGuidebookforthe50thAnnual
MeetingoftheSoutheasternSection,G eologicalSocietyofAmerica,Raleigh,N orthCarolina,p.149-180.
Clark,T.W.,G ore,P.J.,andWatson,M.E.,201,DepositionalandstructuralframeworkoftheDeepRiverTriassicbasin,N orthCarolina,inHoffman,C.W.,ed.FieldTripGuidebookforthe50thAnnual
MeetingoftheSoutheasternSection,G eologicalSocietyofAmerica,Raleigh,N orthCarolina,p.27-50.
Farrar,S.S.,1985a,StratigraphyofthenortheasternN orthCarolinaPiedmont:SoutheasternGeology,v.25,no.3,p.159-183.
WEST EAST
Farrar,S.S.,1985b,TectonicevolutionoftheeasternPiedmont,N orthCarolina:GeologicalSocietyofAmericaBuletin,v.96,p.362-380.
Hibbard,J.,Stoddard,E.F.,Secor,D.,Jr.,andDennis,A.,202,TheCarolinaZone:OverviewofN eoproterozoictoearlyPaleozoicperi-Gondwananterranesalongtheeasternflankofthesouthern00Appalachians:EarthScienceReviews,v.57,n.3/4,p.299-339.
Hoffman,C.W.andGalagher,P.E.,1989,G eologyoftheSoutheastDurhamandSouthwestDurham7.5-minuteQuadrangles,N orthCarolina,Buletin92,N orthCarolinaGeologicalSurvey,34p.
LeMaitre,R.W.,Ed.,2002,IgneousRocks:AClassificationandGlossaryofTerms:RecommendationsoftheInternationalUnionofGeologicalSciences(IUGS)SubcommissionontheSystematicsof
IgneousRocks:Cambridge,CambridgeUniversityPress,252p.
Parker,J.M.,1979,GeologyandmineralresourcesofWakeCounty:N orthCarolinaGeologicalSurveyBuletin86,122p.,1:100,000-scalemap.
Stoddard,E.F.andBlake,D.E.,eds.,GeologyandFieldTripGuide,WesternFlankoftheRaleighmetamorphicbelt,N orthCarolina,Raleigh,N orthCarolinaGeologicalSurvey,CarolinaGeological
SocietyGuidebookfor194,10p.
-3000' -3000'
Weems,R.E.andOlsen,P.E.,1997,SynthesisandrevisionofgroupswithintheN ewarkSupergroup,easternN orthAmerica,GeologicalSocietyofAmericaBuletin,v.109,n.2,p.195-209.
CON TACTS
Lithologiccontacts-Solidwherelocationknown,
dashedwhereinferred,dotedwhereconcealed.
FAULTS
D ?
U
Solidwherelocationknown,dashedwhereinferred,dotedwhereconcealed,queriedwhereuncertain.Dipoffaultsurfaceindicatedwheremeasured.RelativemotiononbritlenormalfaultsindicatedbyD(downthrownside)andU(up).Onductilestrike-slipfault,relativemotionindicatedbyarrows.Incrosssection,fornormalfault,arrowsindicatedirectionofmovement.Forstrike-slipfault,directionofrelativemovementindicatedbyT(towardsobserver)andA(awayfromobserver).
7852'30" 7845'00"
3545'00"
3545'00"
85 70 CZccg
Trcc
73 67 CZrg
76 78
16 59 74 84 78
77
45
Qal
85
84
CZbr1 39
8421
Trcs/c 82
CZbr2
41 78 CZcbp
60 48 60 64 43 CZpbg 72 55 44 64 557660 47 66 59 CZrcs48 47 1064 68 39 38
Trcs/si2 D 45U 70 CZbr1
53 58
35 37
68 54
73
49 10 CZpbg
8 Tphms 60 49
52 8047
34 52 54Tphms 5472 166520 58
5324
36
12
39
70
62
68
80 76 54Qal 14 40 55 53
AP-4
Qal CZpbg
28
48
15
45 51
85
48 6
46
35 52 52
31
Trcc 40 4947
40
53
55 63 68 3822
40
65
35 42
50
52
33
69
45
53 5
55
80 52
29 42
53 52
42
42
47 CZrg
U
42
13
D
26
37
59
45
31
66
47
30
58
Qal
30 25 57 D
75 68 12
9 12
25 54 44 10 47 U 64 68 CZrg
45
72 1665
70 80
CZpbg
CZpbg 72
66
7280
CZbr1
46
Jd Trcs/si2
58 66
CZbr1
80 16 15 CZbr140
Jd Trcs/c D U 2 30
85
17
14
CZcbp CZbr2 45
85
Jd 2585
65
6020 71
6845 60 71
3
408070Jd D 75 70 65 17 U
54 53 80
Qal
10
25
67
80
70
78
56
65
80
CZbr1
9
78
83 30
80
41
16
13
70
85
67 4
Trcs 12 75 58 49Jd
75
7445
CZbr1
1
6
Trcc
80
8
74 CZcbp
65 48
CZpbg
14 60 71 4743
10 51 53Qal 78
CZbr2
80
9 12 6111 15 14 69
12
72 80
568
71 38 22 28 58 14 86
CZsl 78 80Trcs/c 48
A
CZpbg 49 70 28JdJd 28 75
7652 42 70 50
85
79
80
50
9
48
30
30 72 10
58 43
28
8 25 CZsl 39 CZpbg
10
CZpbg 75
48
50
61
41
39
40
14
17 17 930
1347
Qal CZccg75 CZpbg 67 4719 40 SLP-5 55
6076 46
CZsl
68
80
66
51
Qal
9
17
33
29
CZbr3
55
60 63
75 57
12
59
60
85
45
84
67
24
10
14
Trcc
7
Trsc
39 80
Tphms
10
CZbr1
0
53
SLP-4B
68
DU
Tphms
56
50
Ku
80
78
71 56
17 Tphms
CZbr3 Tphms
4
36
27 10 10
38
84
SLP-1 32
14 1412
55 50
15
48
Ku
Tpf
ms 80
13
65
56 12
7
48
54 56
CZbr3 CZsl CZpbg 26 A'
62
5
10
50
47
CZpbg
CZpbg CZccg
Trcs/ 58
Tphms
Tphms
CZbr2 Ku
c
Tphms
Ku CZpbgCZbr1
Tphms
CZrcsTphms
80
Tphms
CZbr1
Tphms
Tphms 72
78
?
CZrg
86 80
CZbr3
CZpbg
CZbr1
40
?
60
80 80 Tphms CZbr2 Tphms
? Ku
Ku 39 62
CZpbg
Tphms
CZbr3 Tpf
ms
Tphms
Tphms
Tpf
ms
Ku
Tphms
Proterozoic-LateProterozoic-LateProterozoic-
Cambrian LateTriassic Jurassic Cretaceous-Tertiary Quaternary Cambrian Paleozoic
Crabtree Crabtree Umstead Metamorphic Creek Meta-intrusive Lithofacies Lithofacies Suite Gneiss CaryMetamorphicSuite Suite Assoc.I Assoc.I
GEOLOGICMAPOFTHEAPEX7.5-MINUTEQUADRANGLE,WAKECOUNTY,NORTHCAROLINA OPENFILEREPORT2016-03
3537'30"3537'30"
7852'30" 7845'00"
SCALE1:24000
10.5 0 1
Miles81/2 NORTHCAROLINA151MILS 116' 1,000 500 0 1,000 2,000 3,000 4,000 5,000 6,000 7,000
Feet
23MILS
10.5 0 1Kilometers
2004MAGNETICNORTH
MAPLOCATION
DECLINATIONATCENTEROFSHEET
CONTOURINTERVAL10FEET
A A'
Depthinfeetbelowgroundsurfacenoverticalexaggeration STRUCTURALSYMBOLS
Observationsitesarecenteredonthestrikebarorareattheintersectionpointofmultiplesymbols.
7
12
StrikeanddipofinclinedbeddinginTriassicsedimentaryrocks Bearingandplungeofcrenulationlineationorminerallineation
27
Strikeanddipofinclinedregionalfoliation(Srs) Horizontalcrenulationlineationorminerallineation
A 14
Strikeofverticalregionalfoliation(Srsv) Bearingandplungeofmineralstretchlineation
T 40
Strikeanddipofinclinedfracturesurface Observationstationlocation
StrikeanddipofinclinedregionalCorC'foliation DiabasestationlocationDisclaimer: 22
ThisOpen-Filereportispreliminaryandhasbeenreviewedfor SLP-1
StrikeofverticalregionalCorC'foliation Geochemistrysamplelocations
conformitywiththeN orthCarolinaGeologicalSurveyeditorialstandards withtheorth StratigraphicCode. or GEOLOGICMAPOFTHEAPEX7.5-MINUTEQUADRANGLE,
or N American Furtherrevisions correctionstothisopenfilemapmayoccur.
FO S
WAKECOUNTY,NORTHCAROLINA LD
ByEdwardF.Stoddard,TimothyW.Clark,NormanK.GayandKevinMiller
DigitalrepresentationbyMichaelA.MedinaandHeatherD.Hanna anticline concealed syncline Scanwithsmartphoneforlink
toGeoPDFofmap.2016 ThirdpartyApprequired.
ThisgeologicmapwasfundedinpartbytheUSGSN ationalCooperativeGeologicMappingProgramunderStateMap.Bedrockgeologymapped197�198(StateMapAwardFY197).CoastalPlainmapped2001�2002(StateMapAward01HQAG0061,FY2001).Additionalbedrockdatacolectionfrom202�2010.
BasetopographicmapisadigitalrastergraphicimageoftheApex7.5-minutequadrangle(1993),N orthCarolinaStatePlaneN AD83meterscoordinatesystem,LambertConformalConicprojection.
