geologic map of the frederick 30 x ... › sim › 2889 › frederickmaptoweb.pdfgreat valley...

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F BU R NT MILLS F A UL T RO CK CREE K SH E A R ZON E P L U M M E R S I S L A N D F AU L T BULL RUN MOUNTAIN FAULT SHORT HILL FAULT KEEDYSVILLE FAULT HYATTSTOWN THRUST FAULT PLEASANT GROVE FAULT PLEASANT GROVE FAULT B ARNESVILLE-M O N R O V IA T H R U S T F A U L T PL U MME RS I SLA ND F A UL T B R I N K L O W T H R U S T F A U L T BU L L RU N M OU N T A I N F A U L T B Zmd Zmd Zmd Zmd Zmd Zmd O|c |e |e |e |wac |cb |cb |wact |war |t |ca |ch |e |wact |wac |war |t |ca |ch |cwo |cwm |ca |ca |t |chs |chs |ch |ch |cwo |cwm |cwb Zcm Zcp Zss Ylg Ylg Yq Yq Yc Ypg Yp Yp Yp Yp Ypg Zcm Zss Ymc Yml Ym Ym Yml Zfsc Zfsm Zfcr Zcma Zcm Zcp |cw Jcm Jmm J^cc J^cc J^cc J^ccg J^ccg ^cbb Jdh Jdg J^tm J^tm J^tm ^cbb Jdh Jdh J^tm ^cbb Jd ^cbb ^cmp |Zmbs ^cmr J^tm Jdc ^cbb Jdh J^tm ^cbb ^cbg ^cmp ^cmr |Zmbs |Zms |Zmg |Zmg |Zmg |Zmg Jd Jd |Zu |Zms |Zms |Zu |Zu |Zmt |Zms |Zms |Zms |Zmg |Zmg |Zmm |Zmp |Zmm |Zmg Ob Ob |Zmp |s |s Ogh Ogp |s Ogg Ogg Ogh Ogh Ogh |s |s |Zu Ok |lu |lu |l GREAT VALLEY SECTION BLUE RIDGE-SOUTH MOUNTAIN ANTICLINORIUM SHENANDOAH RIVER BLUE RIDGE SHORT HILL FAULT Black Oak Ridge CATOCTIN MOUNTAIN CULPEPER BASIN POTOMAC TERRANE BULL RUN MOUNTAIN FAULT U.S. ROUTE 15 Goose Creek WASHINGTON AND OLD DOMINION RAILROAD REGIONAL TRAIL STATE ROUTE 7 Broad Run Sugarland Run Cabin John Creek POTOMAC RIVER STATE ROUTE 190 PLUMMERS ISLAND FAULT INTERSTATE ROUTE 270 INTERSTATE ROUTE 495 INTERSTATE ROUTE 495 INTERSTATE ROUTE 495 BLUE RIDGE PROVINCE VALLEY AND RIDGE PROVINCE PIEDMONT PROVINCE 4000 3000 2000 1000 SEA LEVEL 1000 2000 3000 4000 3000 2000 1000 SEA LEVEL 1000 2000 3000 4000 |cb |cb O|c O|c |e |e Zcm |cw |ch |ca |t |wa |wa |e |cb Obss O|c Obs Obrr Osnr Osnr Om Oc Oc Obps Obps Om Oc |t |ca |ch Obrr Obs O|c Obss Obss |cb |e |wa |t |ca |ch |cw Zcm Yhm O|c |cb |cb |wac |wact |e |e |e |war |war |td |tbh |t |ca |ca |cwo |cwm |tbh |tf |tb |ch |cwb Zcm |td |ca |ch |ch Zcr |cwo |cwm |cwb Yhm |chs |clc Zcm Yg Yg Zsm Zss Zmd Zmd Zrd Zrd Ybg Ybg |cwb |clp Zcm |cwm |ca |ch |cw |clp Zcm ^cmp ^cmt ^cbl O|gu |fl O|gl |fa |fa |fr |fr |frs |frs |fr |fr |ar |ar |u |u |sq |Zsb |Zip Jd |Zip |Zip |Ziq |uq |uq |uq |uq |Zsq |Zsb |sq |Zsb |Zss |Zsb |Zsc |Zsb |Zsb |Zsb |Zsmp |Zsmp |Zmbq |Zmbq |Zmbs |Zmbs |Zms |Zu |Zmg |Zp |s |Zmp INTERSTATE ROUTE 81 STATE ROUTE 9 U.S. ROUTE 11 MASSANUTTEN SYNCLINORIUM SUGARLOAF MOUNTAIN ANTICLINORIUM Opequon Creek Opequon Creek Rockymarsh Run POTOMAC RIVER Sharpsburg Antietam Creek Catoctin Creek BLUE RIDGE STATE ROUTE 67 SOUTH MOUNTAIN BLUE RIDGE-SOUTH MOUNTAIN ANTICLINORIUM GREAT VALLEY SECTION CULPEPER BASIN FREDERICK VALLEY SYNCLINORIUM WESTMINSTER TERRANE POTOMAC TERRANE CATOCTIN MOUNTAIN U.S. ROUTES 15 AND 340 Frederick INTERSTATE ROUTE 270 INTERSTATE ROUTE 70 Monocacy River Bush Creek MARTIC FAULT MARTIC FAULT KEEDYSVILLE FAULT BULL RUN MOUNTAIN FAULT MARTIC FAULT HYATTSTOWN THRUST FAULT BARNESVILLE-MONROVIA THRUST FAULT Monrovia Silver Spring PLEASANT GROVE FAULT ROCK CREEK SHEAR ZONE INTERSTATE ROUTE 70 STATE ROUTE 97 PLUMMERS ISLAND FAULT VALLEY AND RIDGE PROVINCE BLUE RIDGE PROVINCE PIEDMONT PROVINCE |Zsb 1000 meters = 3281 feet Surficial deposits are not shown 4000 3000 2000 1000 SEA LEVEL 1000 2000 3000 4000 1000 meters = 3281 feet Surficial deposits are not shown B 4000 3000 2000 1000 SEA LEVEL 1000 2000 3000 4000 B ' A ' A NO VERTICAL EXAGGERATION NO VERTICAL EXAGGERATION METERS METERS METERS 4000 METERS PL EAS ANT GR OVE FAULT Qt Qcf Qcc Qr Jdc Ql Kps Dp QTt Qa |t |wa |tf |tbh |tb |war |td |wact |e |wac |cb |f |sq |u |um |uq |ar |fr |frs |cs |sql |squ |sqm |fa O|gl |fl O|gu Obss O|c Obs Obrr Obps Oc Osnr Om Yc Ya Yq Yp Ylg* Ypg* Yhm* Ymc* Yqp* Ym* Ygt* Yg* Yml* Ypb* Ybg* Zrc* |clp |clc |cwm |cwmq |cwb |cwo |cw Jd* Jdh* Zmd Zrd* Jdg* 201.2 ±1.3 Ma 201.2 ±1.3 Ma 571.5±5 Ma 200 Ma Ogp Ong Onu Ontr Ogg Ogh* Ok* Oq Dg* 362±3 Ma Odl Odt Ob 478±6 Ma 463±8 Ma 472±4 Ma 449±7 Ma Odm* 1,149±19 Ma 1,111±2 Ma to 1,112±3 Ma 1,140 Ma 1,144±2 Ma Ont* |Zms |Zmg |Zmm |Zmp |Zmt |lu |l |Zo |Zl |Zlm |Zn |s J^tm Jms Jmss Jmtc Jmt Jmh Jmhs Jmmc Jmm Jcm Zcm Zcr* Zcma Zcs Zcp J^cc J^ccg ^cbl ^cbg ^cbb |ca |t |cp Zss Zsp Zsm Zfcr Zfsc Zfsm ^cmt ^cmp ^cmr |ch |chs |Zsm |Zsb |Zsf |Zsqp |Zw |Zicp |Zim |Zicm |Zic |Zp |Zsd |Zu |Zg |Zpq |Zpb |Zmbb |Zmbs |Zmbq |Zmbg |Ziq |Zip |Zib |Zstp |Zss |Zsc |Zshp |Zsl |Zil Stratified rocks Stratified rocks Stratified rocks CORRELATION OF MAP UNITS (Units with an asterisk have been dated) VALLEY AND RIDGE PROVINCE BLUE RIDGE PROVINCE PIEDMONT PROVINCE GREAT VALLEY SECTION CULPEPER AND GETTYSBURG BASINS FREDERICK VALLEY SYNCLINORIUM SUGARLOAF MOUNTAIN ANTICLINORIUM AND BUSH CREEK BELT WESTMINSTER TERRANE POTOMAC TERRANE UNCONSOLIDATED SURFICIAL MATERIALS COASTAL PLAIN PROVINCE Intrusive rocks Stratified rocks Stratified rocks Intrusive rocks Intrusive rocks |Zsq |Zsmp Stratified rocks Stratified rocks Meriden Group Chatham Group Chilhowee Group Fauquier Group Newark Supergroup Unconformity Lower Cretaceous Holocene Tertiary Upper Ordovician Middle Cambrian Lower Jurassic TRIASSIC QUATERNARY Upper Triassic Lower Ordovician and Upper Cambrian Lower Cambrian and (or) Neoproterozoic Pleistocene Upper Devonian Middle Ordovician Neoproterozoic Lower Cambrian Lower Ordovician Upper Cambrian Mesoproterozoic DEVONIAN JURASSIC ORDOVICIAN CAMBRIAN PROTEROZOIC CRETACEOUS 600 Ma 722±3 Ma 1,055±2 Ma 1,055±4 Ma 1,059±2 Ma 1,060±2 Ma 1,077±4 Ma 1,077±4 Ma 1,153±6 Ma Beekmantown Group ? ? ? ? 32 44 77 47 60 75 40 L Qa Qt Qr Ql QTt Om Oc Osnr Obps Obrr Obs Obss O|c |cb Qcf Qcc |e Ypb Zrc Ybg Yml Yg Ygt Yqp Ym Ymc Ypg Yhm Ylg Jms J^tm Jmss Jmt Jmtc |Zo |Zl |Zlm |Zn |Zsd |Zu |Zg Kps Jmh Jmhs Jmm Jmmc Jcm J^cc |cs |ar J^ccg Ob |s |l |lu |u |um |uq Dp Dg Oq Ok |Zw Yc Ya Yp Yq |t |cp |ca |ch |chs |t |wac |wact |war |wa |td |tb |tf |tbh ^cbg ^cbb ^cbl O|gu O|gl |frs |f ^cmp ^cmt ^cmr |fl |fa |fr |Zmp |Zmt |Zms |Zmg |Zmm |sq |squ |sqm |sql |Zstp |Zsb |Zsf |Zsm |Zsqp |Zsmp |Zshp |Zsl |Zsq |Zss |Zsc |Zip |Zil |Zib |Ziq |Zim |Zic |Zicm |Zicp |Zmbs |Zmbg |Zmbb Ogh Ogg Ogp |Zmbq Ont Ong Onu Odm Odl Odt Ontr |Zp |Zpb |Zpq |cwo |cwm |clc |clp |cwmq Zrd Zmd Zfcr Zsm Zsp Zfsm Zfsc Zss |cwb |cw Zcm Zcs Zcp Zcr Jd Jdc Jdh Jdg Zcma LIST OF MAP UNITS [Map units are shown generally from west to east. For descriptions, please see accompanying text pamphlet.] UNCONSOLIDATED SURFICIAL MATERIALS Alluvium (Holocene) Terrace deposit, low level (Holocene and Pleistocene) Colluvium (Holocene and Pleistocene) Fine colluvium Coarse colluvium Residuum (Holocene and Pleistocene) Lag gravel (Holocene and Pleistocene) Terrace deposit, high level (Pleistocene and Tertiary) VALLEY AND RIDGE PROVINCE Great Valley Section Martinsburg Formation (Upper and Middle Ordovician) Chambersburg Limestone (Middle Ordovician) St. Paul Group (New Market and Row Park Limestones, undivided) (Middle Ordovician) Beekmantown Group Pinesburg Station Dolomite (Middle Ordovician) Rockdale Run Formation (Middle and Lower Ordovician) Stonehenge Limestone (upper part) (Lower Ordovician) Stoufferstown Member Conococheague Limestone (Lower Ordovician and Upper Cambrian) Big Spring Station Member (Upper Cambrian) Elbrook Limestone (Upper and Middle Cambrian) Waynesboro Formation (Lower Cambrian) Chewsville Member Cavetown Member Red Run Member Undivided—Shown in cross section only Tomstown Formation (Lower Cambrian) Dargan Member Benevola Member Fort Duncan Member Bolivar Heights Member BLUE RIDGE PROVINCE Tomstown Formation (Lower Cambrian) Carbonaceous phyllite (Lower Cambrian) Chilhowee Group Antietam Formation (Lower Cambrian) Harpers Formation (Lower Cambrian) Metasandstone Weverton Formation (Lower Cambrian) Owens Creek Member Maryland Heights Member Quartzite Buzzard Knob Member Undivided Loudoun Formation (Lower Cambrian) Conglomerate Phyllite Catoctin Formation (Neoproterozoic) Metabasalt Metasedimentary phyllite Tuffaceous phyllite Metarhyolite Marble Metadiabase dike (Neoproterozoic) Metarhyolite dike (Neoproterozoic) Swift Run Formation (Neoproterozoic) Marble Phyllite Metasandstone and schist Fauquier Group Carter Run Formation (Neoproterozoic) Swains Mountain Formation (Neoproterozoic) Metamudstone Boulder conglomerate Cobbler Mountain Alkali Feldspar Quartz Syenite of the Robertson River Igneous Suite (Neoproterozoic) Megacrystic metagranite (Mesoproterozoic) Biotite granite gneiss (Mesoproterozoic) Pink leucocratic metagranite (Mesoproterozoic) White leucocratic metagranite (Mesoproterozoic) Garnetiferous metagranite (Mesoproterozoic) Quartz-plagioclase gneiss (Mesoproterozoic) Marshall Metagranite (Mesoproterozoic) Coarse-grained metagranite (Mesoproterozoic) Porphyroblastic metagranite (Mesoproterozoic) Hornblende monzonite gneiss (Mesoproterozoic) Layered granitic gneiss (Mesoproterozoic) Charnockitic granite (Mesoproterozoic) Amphibolite (Mesoproterozoic) Garnet-graphite paragneiss (Mesoproterozoic) Quartzite and quartz-sericite tectonite (Mesoproterozoic) PIEDMONT PROVINCE Culpeper and Gettysburg Basins Diabase dikes and sills (Early Jurassic) Crystalline diabase High-titanium quartz-normative early cumulates High-titanium quartz-normative late cumulates Granophyre Thermally metamorphosed rocks (Lower Jurassic and Upper Triassic) Meriden Group Sander Basalt (Lower Jurassic) Sandstone and siltstone Turkey Run Formation (Lower Jurassic) Conglomerate Hickory Grove Basalt (Lower Jurassic) Sandstone and siltstone Midland Formation (Lower Jurassic) Conglomerate Chatham Group Mount Zion Church Basalt (Lower Jurassic) Catharpin Creek Formation (Lower Jurassic and Upper Triassic) Goose Creek Member Bull Run Formation (Upper Triassic) Groveton Member Balls Bluff Member Leesburg Member Manassas Sandstone (Upper Triassic) Poolesville Member Tuscarora Creek Member Reston Member Frederick Valley Synclinorium Grove Formation (Lower Ordovician and Upper Cambrian) Upper member Lower member Frederick Formation (Upper Cambrian) Lime Kiln Member Adamstown Member Rocky Springs Station Member Shale Undivided Cash Smith Formation (Upper and Middle Cambrian) Araby Formation (Middle and Lower Cambrian) Sugarloaf Mountain Anticlinorium and Bush Creek Belt Urbana Formation (Lower Cambrian?) Marble Quartzite Sugarloaf Mountain Quartzite (Lower Cambrian) Upper member Middle member Lower member Undivided--Shown in cross section only Westminster Terrane Wakefield Marble (Lower Cambrian? and Neoproterozoic?) Sams Creek Formation (Lower Cambrian? and Neoproterozoic?) Metabasalt Felsic schist Marble Tuffaceous phyllite Muscovitic phyllite Hematitic phyllite Metalimestone Quartzite interbedded with phyllite Quartzite Metasiltstone Calcareous metasandstone Ijamsville Phyllite (Lower Cambrian? and Neoproterozoic?) Phyllite Metabasalt Quartzite Marble Metalimestone Phyllitic conglomerate Conglomeratic metagraywacke Chloritic phyllite Marburg Formation (Lower Cambrian? and Neoproterozoic?) Metasiltstone Metagraywacke Metabasalt Quartzite Prettyboy Schist (Lower Cambrian? and Neoproterozoic?) Metabasalt Quartzite Potomac Terrane Pegmatite (Late Devonian) Guilford Granite (Late Devonian) Quartz bodies (Ordovician) Norbeck Intrusive Suite (Late Ordovician) Biotite-hornblende tonalite Quartz gabbro Ultramafic rocks Trondhjemite Kensington Tonalite (Middle Ordovician) Georgetown Intrusive Suite (Early Ordovician) Biotite-hornblende tonalite Quartz gabbro Metapyroxenite Dalecarlia Intrusive Suite (Early Ordovician) Biotite monzogranite and granodiorite Leucocratic muscovite-biotite monzogranite Muscovitic trondhjemite Bear Island Granodiorite (Ordovician?) Sykesville Formation (Lower Cambrian) Laurel Formation (Lower Cambrian) Upper part Oella Formation (Lower Cambrian and (or) Neoproterozoic) Loch Raven Schist (Lower Cambrian and (or) Neoproterozoic) Semipelitic schist and meta-arenite Northwest Branch Formation (Lower Cambrian and Neoproterozoic) Mather Gorge Formation (Lower Cambrian and (or) Neoproterozoic) Quartz-rich schist Metagraywacke Migmatite Phyllonite Metatuff Soldiers Delight Ultramafite (Lower Cambrian and (or) Neoproterozoic) Mafic and ultramafic rocks (Lower Cambrian and Neoproterozoic) Metagabbro and metapyroxenite (Lower Cambrian and Neoproterozoic) COASTAL PLAIN PROVINCE Potomac Formation (Lower Cretaceous) EXPLANATION OF MAP SYMBOLS Contact—Dotted where concealed Lake bed—Dotted where concealed FAULTS (Dashed where inferred; dotted where concealed) Thrust fault—Sawteeth on upper plate Normal fault—Ball and bar on downthrown side Reactivated fault—Open ball and bar on downthrown side of early normal fault and sawteeth on upper plate of later thrust fault; shown in cross section as a double-headed arrow Overturned thrust fault—Bar on upper plate; sawteeth show direction of dip Strike-slip fault—Arrows show relative movement Unclassified Shear zone PLANAR FEATURES (May be combined with linear features; where features are combined, intersection of symbols marks point of intersection) Strike and dip of bedding Inclined Overturned Vertical Horizontal Strike and dip of Mesoproterozoic foliation including compositional layering Inclined Vertical Strike and dip of first-generation (S 1 ) Paleozoic cleavage and (or) schistosity Inclined Vertical Strike and dip of second-generation (S 2 ) Paleozoic cleavage and (or) schistosity Inclined Vertical Strike and dip of mylonitic and phyllonitic foliation Inclined Vertical LINEAR FEATURES (May be combined with planar features; where features are combined, intersection of symbols marks point of intersection) Bearing and plunge of axis of minor fold OTHER FEATURES Location of isotopically dated rock—Sample dated by U-Pb dating techniques Quarry or mine, active and inactive—Abbreviations are as follows: Ag, silver; Au, gold; C, chromite; Cu, copper; D, diabase; F, hematite, limonite, manganese, and iron ore; L, limestone; M, marble; Pb, lead; S, building stone; Sl, slate; Zn, zinc Radon in soil gas—Shown where greater than 200 pCi/L (Gunderson and others, 1988) Small sinkhole—Less than or equal to 50 m 2 in diameter Large sinkhole L L L L L L L L L L L L F L L L F F F F F F F Zn L F F F F F Sl M M S S S Au M L L L F M L L L L L L L L L L L L F F F F L L L Sl M M M M M M L F F Au L F F L L L L M Cu, Au,Ag M M F C Sl Sl Sl L L F S F S Sl F D S S M D Cu D D S S S S S Cu S S S S Au Au F S F M M M M Cu,Ag Pb Cu Cu,Zn F 40 56 32 57 5 62 35 16 39 67 16 50 80 5 45 22 25 30 35 70 75 50 34 72 40 80 54 25 52 60 35 78 74 25 36 15 65 15 15 78 45 87 62 68 62 20 35 20 60 22 65 57 56 75 36 46 32 13 46 20 61 25 43 11 18 80 20 38 52 25 3 42 2 5 45 20 35 35 53 52 46 47 62 56 35 44 56 36 60 18 36 50 20 66 20 25 32 40 60 23 80 35 60 29 30 35 50 39 68 23 58 62 22 28 56 30 42 24 49 40 70 65 10 3 36 10 55 35 50 20 20 17 37 62 42 25 34 70 28 46 2 57 43 45 15 30 27 13 17 27 40 45 40 37 23 36 20 80 65 52 74 78 58 5 63 82 75 78 75 58 82 50 42 25 30 12 50 75 40 81 47 35 72 52 64 44 84 60 40 34 32 60 21 45 45 75 35 15 62 53 60 25 52 48 40 42 45 75 30 75 72 80 21 53 48 11 75 56 82 86 72 42 55 20 67 42 62 19 55 50 82 85 60 59 82 40 78 70 51 85 40 50 68 67 45 80 78 80 73 62 62 19 55 60 43 34 62 25 50 52 55 35 86 54 25 77 71 72 61 47 70 68 82 55 25 70 82 36 66 10 56 26 62 36 29 70 29 52 40 87 85 47 35 35 63 28 86 75 75 58 86 67 62 12 34 58 77 88 68 83 26 70 7 15 76 82 15 60 50 67 8 89 45 82 77 47 77 40 60 48 73 4 12 12 15 14 2 11 8 15 68 35 5 21 15 85 70 60 28 72 60 20 14 12 82 73 49 73 45 20 58 18 10 82 12 8 22 2 15 67 12 10 18 17 65 22 45 5 36 47 81 47 70 78 15 25 12 15 40 17 15 64 5 8 63 83 43 50 78 62 25 83 54 86 32 70 28 10 40 78 70 50 77 60 62 23 72 51 86 12 12 13 85 20 8 82 33 45 20 32 2 59 35 37 37 35 35 38 20 40 62 85 81 34 33 27 31 42 37 23 79 24 19 50 20 47 78 62 85 30 73 28 65 40 47 51 85 69 40 80 85 70 80 50 47 8 15 36 50 74 41 28 6 32 35 22 32 5 11 18 12 5 12 68 70 21 83 58 83 31 70 35 45 66 45 74 36 64 50 15 26 50 34 28 24 23 56 60 45 70 55 86 17 75 52 73 12 45 67 30 29 55 86 80 80 85 50 85 45 58 50 6 66 16 45 5 24 70 45 80 45 33 85 60 30 70 36 13 81 78 73 60 75 85 80 80 70 84 75 81 85 38 70 78 85 65 57 39 65 85 86 65 66 87 74 44 75 75 6 20 83 80 80 85 67 60 40 45 38 50 65 67 48 77 60 80 55 70 70 55 66 57 80 45 40 55 42 47 50 60 75 70 83 68 80 78 43 52 40 60 40 30 57 45 28 16 42 55 65 60 85 72 41 22 10 50 26 25 21 70 3 13 80 51 71 80 20 75 70 63 19 39 35 58 32 74 26 12 22 25 27 25 16 11 26 18 32 83 50 42 75 25 10 44 45 38 25 24 27 30 22 53 32 20 24 77 33 26 25 20 18 18 10 12 5 11 10 16 11 15 10 10 24 45 25 33 28 30 34 24 50 75 33 11 12 21 22 6 10 20 38 22 16 10 20 80 8 47 19 80 84 78 62 13 10 72 80 81 81 14 32 20 12 16 17 26 10 12 25 70 73 80 70 60 80 55 50 35 60 80 70 72 60 58 58 75 30 83 45 80 70 75 52 65 85 75 67 70 60 65 70 80 35 80 45 50 80 77 78 81 65 45 85 80 67 45 80 35 45 75 35 25 15 73 4 47 5 78 74 45 55 65 70 89 16 10 10 85 83 86 30 72 80 67 78 63 85 65 55 73 82 88 84 80 75 75 14 55 35 23 21 75 81 39 86 83 16 25 11 20 86 40 6 11 43 74 55 63 87 8 65 10 25 77 80 50 68 50 78 77 80 60 60 65 50 40 70 78 16 14 17 7 24 32 13 34 17 15 82 86 12 38 37 44 30 37 24 20 24 45 35 15 25 20 27 17 16 15 25 20 28 78 8 21 26 10 22 27 29 17 12 12 20 6 13 10 22 25 15 7 22 10 8 20 8 19 60 78 20 4 13 9 8 18 25 10 16 24 12 15 21 6 9 8 15 3 8 20 16 20 15 36 8 21 12 10 20 70 78 75 53 43 18 80 65 65 50 15 60 54 30 20 10 16 82 70 70 75 80 70 70 56 80 35 60 60 45 85 80 48 50 12 80 45 80 65 15 64 80 5 15 10 12 31 75 62 7 34 77 80 65 84 36 50 25 32 3 40 51 30 29 20 5 48 15 60 50 40 65 20 25 60 80 10 14 20 10 5 13 60 74 85 47 76 47 42 50 40 28 35 43 6 36 80 21 18 61 70 15 16 87 30 70 25 80 70 30 70 50 30 48 62 42 30 42 82 45 25 27 70 35 20 55 60 24 67 80 25 35 31 35 78 45 73 50 40 35 58 25 74 82 80 35 89 80 35 50 60 55 27 78 22 60 49 48 52 70 80 83 67 67 60 58 62 60 57 40 56 82 28 65 75 60 42 52 23 80 65 29 15 30 45 35 45 45 58 42 40 50 27 57 22 37 41 68 32 15 26 34 32 33 31 21 22 21 37 86 42 81 63 54 32 50 37 3 52 43 81 81 72 82 44 60 21 45 86 81 65 82 81 22 45 47 37 33 33 31 30 31 43 32 32 35 42 32 45 46 33 27 43 17 24 43 41 49 23 48 33 30 44 47 28 41 18 35 31 40 22 32 70 47 79 49 38 16 23 38 65 33 25 24 20 23 78 38 33 40 25 80 12 40 57 54 50 79 63 63 30 80 27 60 60 51 28 68 40 88 34 9 50 49 20 15 63 34 57 33 38 77 75 35 57 77 66 68 75 38 71 50 67 40 72 57 30 41 23 31 20 32 21 21 30 49 32 37 67 32 86 32 36 30 34 30 36 34 42 30 20 67 44 35 27 80 75 87 22 22 40 24 37 80 41 61 11 76 44 32 66 45 22 31 47 66 40 37 21 78 32 55 85 77 62 28 38 41 53 80 42 44 81 73 75 63 50 25 55 82 65 60 45 35 25 70 60 80 45 45 77 81 45 45 60 55 82 30 82 68 50 60 26 50 77 75 35 87 24 53 55 35 80 33 50 20 30 45 70 18 25 26 57 25 22 10 88 16 64 41 89 45 43 10 28 26 29 31 17 5 35 23 20 45 15 36 35 15 20 25 25 80 80 40 70 80 30 52 20 44 55 27 18 32 15 58 55 70 70 60 30 54 26 60 86 4 60 34 30 45 80 56 22 32 54 58 52 41 70 20 34 25 20 34 44 70 40 50 47 62 46 40 40 40 55 15 60 60 75 47 78 70 79 75 75 80 75 78 50 57 60 55 45 75 77 87 50 83 82 70 55 81 67 83 45 45 46 47 52 45 70 74 78 80 62 48 60 71 30 53 78 75 60 53 41 74 82 80 61 68 67 60 52 60 80 38 80 78 46 75 65 70 75 75 78 74 75 78 83 71 85 80 85 85 67 84 87 85 45 30 54 55 80 75 44 72 72 73 70 72 16 81 72 50 68 73 80 67 53 78 33 75 76 67 28 79 52 60 40 62 75 34 32 65 49 78 64 30 80 82 44 43 20 68 68 60 45 44 30 29 30 65 72 46 70 27 78 40 46 30 30 86 77 80 80 85 72 75 76 82 82 82 52 60 27 43 56 15 23 25 43 36 46 35 30 35 47 20 52 75 31 53 27 72 61 50 36 70 44 50 80 20 84 36 42 58 34 46 38 57 70 5 25 56 15 10 28 44 40 84 65 55 80 83 42 25 23 32 50 38 58 88 30 85 40 68 15 77 41 38 43 45 17 25 15 22 55 80 55 36 54 26 25 25 58 53 33 70 56 47 32 10 51 35 23 38 22 45 20 47 35 15 25 45 68 47 20 55 16 10 45 27 42 45 35 50 56 45 23 32 30 30 25 30 58 59 43 65 71 62 84 50 40 70 73 78 23 67 40 58 50 53 34 30 75 59 72 70 86 35 28 6 22 60 15 55 29 60 70 10 48 45 50 50 20 25 36 22 20 62 25 33 67 78 51 19 29 10 44 42 45 58 46 50 41 37 15 18 55 32 49 44 60 32 28 57 36 37 56 25 21 36 27 32 30 62 28 46 78 85 4 42 50 75 50 52 69 80 73 83 72 80 65 80 80 77 84 88 74 62 32 80 55 73 80 70 67 53 45 70 75 53 55 30 25 81 19 21 37 67 79 72 42 86 72 44 16 32 59 55 42 42 20 40 30 27 45 35 45 51 45 30 55 48 45 65 60 46 68 40 39 48 50 45 35 65 23 34 35 20 30 40 50 60 65 28 20 55 45 74 14 45 25 42 27 26 42 45 45 48 45 36 36 30 36 35 45 25 35 80 30 65 35 40 33 22 35 65 58 31 48 49 53 53 28 35 45 31 25 30 27 16 38 25 35 35 77 47 32 40 43 55 30 43 25 65 50 70 40 40 25 37 68 65 85 85 45 5 70 28 76 80 83 80 21 73 70 83 50 64 80 67 60 61 77 70 73 80 88 64 52 44 84 70 83 80 52 68 35 58 75 65 64 78 80 82 88 15 32 75 21 72 47 83 35 75 81 64 72 55 65 15 75 43 71 75 70 60 32 80 80 70 75 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Zcp Zcp Zcp Zss Zss Zcr Zmd |ca |t |t Zcr Zmd Zmd Zsm Jd Jd Jd QTt |Zsq |Zmbq |Zmbq |Zmbq |Zmbq Qa |Zsq |Zsq |Zsq |Zsq Qa Jd |e |e |e |cb |cb O|c O|c O|c |e |e |e |e O|c O|c O|c O|c O|c |cb |cb Obss |war Qa Oq U.S. DEPARTMENT OF THE INTERIOR U.S. GEOLOGICAL SURVEY SCIENTIFIC INVESTIGATIONS MAP SIM 2889 Explanatory pamphlet accompanies map 1 10 KILOMETERS 0 1 2 4 3 5 6 7 8 9 SCALE 1:100 000 1 8 MILES 1 0 2 3 4 5 6 7 CONTOUR INTERVAL 10 METERS NATIONAL GEODETIC VERTICAL DATUM OF 1929 Base from U.S. Geological Survey, 1984 1983 North American datum 25,000-foot grid ticks based on Georgia coordinate system, west zone 10,000-meter Universal Transverse Mercator grid ticks, zone 16 Geology mapped from 1989 to 1994 Digital compilation by James E. Reddy and Danielle Denenny Geologic map editing by Elizabeth D. Koozmin Digital cartography by D. Paul Mathieux MAGNETIC NORTH APPROXIMATE MEAN DECLINATION, 2007 TRUE NORTH 10 / ° 1 2 VIRGINIA MARYLAND MAP LOCATION W. VA. GEOLOGIC MAP OF THE FREDERICK 30' X 60' QUADRANGLE, MARYLAND, VIRGINIA, AND WEST VIRGINIA By Scott Southworth, 1 David K. Brezinski, 2 Avery Ala Drake, Jr., 3 William C. Burton, 1 Randall C. Orndorff, 1 Albert J. Froelich, 4 James E. Reddy, 1 Danielle Denenny, 1 and David L. Daniels 3 1 U.S. Geological Survey, Reston, Va. 2 Maryland Geological Survey, Baltimore, Md. 3 U.S. Geological Survey, Retired. 4 Deceased. 2007 Printed on recycled paper This map is available for sale by U.S. Geological Survey, Information Services, Box 25286, Denver Federal Center, Denver, CO 80225 For product and ordering information: World Wide Web: http://www.usgs.gov; Telephone: 1-888-ASK-USGS Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government

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Page 1: GEOLOGIC MAP OF THE FREDERICK 30 X ... › sim › 2889 › FrederickmapToWeb.pdfGREAT VALLEY SECTION BLUE RIDGE-SOUTH MOUNTAIN ANTICLINORIUM CULPEPER BASIN FREDERICK VALLEY SYNCLINORIUM

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Stratified rocks

Stratified rocks

Stratified rocks

CORRELATION OF MAP UNITS(Units with an asterisk have been dated)

VALLEY AND RIDGEPROVINCE BLUE RIDGE PROVINCE PIEDMONT PROVINCE

GREAT VALLEY SECTION

CULPEPER AND GETTYSBURG BASINS

FREDERICK VALLEYSYNCLINORIUM

SUGARLOAF MOUNTAINANTICLINORIUM AND

BUSH CREEK BELT

WESTMINSTER TERRANE

POTOMAC TERRANE

UNCONSOLIDATED SURFICIAL MATERIALS

COASTAL PLAINPROVINCE

Intrusive rocks

Stratified rocks

Stratified rocks

Intrusive rocks

Intrusive rocks

|Zsq

|Zsmp

Stratified rocks

Stratified rocks

MeridenGroup

ChathamGroup

ChilhoweeGroup

FauquierGroup

NewarkSupergroup

Unconformity

Lower Cretaceous

Holocene

Tertiary

Upper Ordovician

Middle Cambrian

Lower Jurassic

TRIASSIC

QUATERNARY

Upper Triassic

Lower Ordovicianand Upper Cambrian

Lower Cambrianand (or)

Neoproterozoic

Pleistocene

Upper Devonian

Middle Ordovician

Neoproterozoic

Lower Cambrian

Lower Ordovician

Upper Cambrian

Mesoproterozoic

DEVONIAN

JURASSIC

ORDOVICIAN

CAMBRIAN

PROTEROZOIC

CRETACEOUS

600 Ma

722±3 Ma

1,055±2 Ma

1,055±4 Ma

1,059±2 Ma

1,060±2 Ma

1,077±4 Ma

1,077±4 Ma

1,153±6 Ma

BeekmantownGroup

??

??

32

44

77

47

60

75

40

L

Qa

Qt

Qr

Ql

QTt

Om

Oc

Osnr

Obps

Obrr

Obs

Obss

O|c

|cb

Qcf

Qcc

|e

Ypb

Zrc

Ybg

Yml

Yg

Ygt

Yqp

Ym

Ymc

Ypg

Yhm

Ylg

Jms

J^tm

Jmss

Jmt

Jmtc

|Zo

|Zl

|Zlm

|Zn

|Zsd

|Zu

|Zg

Kps

Jmh

Jmhs

Jmm

Jmmc

Jcm

J^cc

|cs

|ar

J^ccg

Ob

|s

|l

|lu

|u

|um

|uq

Dp

Dg

Oq

Ok

|Zw

Yc

Ya

Yp

Yq

|t

|cp

|ca

|ch

|chs

|t

|wac

|wact

|war

|wa

|td

|tb

|tf

|tbh

^cbg

^cbb

^cbl

O|gu

O|gl

|frs

|f

^cmp

^cmt

^cmr

|fl

|fa

|fr

|Zmp

|Zmt

|Zms

|Zmg

|Zmm

|sq

|squ

|sqm

|sql

|Zstp

|Zsb

|Zsf

|Zsm

|Zsqp

|Zsmp

|Zshp

|Zsl

|Zsq

|Zss

|Zsc

|Zip

|Zil

|Zib

|Ziq

|Zim

|Zic

|Zicm

|Zicp

|Zmbs

|Zmbg

|Zmbb

Ogh

Ogg

Ogp

|Zmbq

Ont

Ong

Onu

Odm

Odl

Odt

Ontr

|Zp

|Zpb

|Zpq

|cwo

|cwm

|clc

|clp

|cwmq

Zrd

Zmd

Zfcr

Zsm

Zsp

Zfsm

Zfsc

Zss

|cwb

|cw

Zcm

Zcs

Zcp

Zcr

Jd

Jdc

Jdh

Jdg

Zcma

LIST OF MAP UNITS

[Map units are shown generally from west to east. For descriptions, please see accompanying text pamphlet.]

UNCONSOLIDATED SURFICIAL MATERIALS

Alluvium (Holocene)

Terrace deposit, low level (Holocene and Pleistocene)

Colluvium (Holocene and Pleistocene)

Fine colluvium

Coarse colluvium

Residuum (Holocene and Pleistocene)

Lag gravel (Holocene and Pleistocene)

Terrace deposit, high level (Pleistocene and Tertiary)

VALLEY AND RIDGE PROVINCE

Great Valley Section

Martinsburg Formation (Upper and Middle Ordovician)

Chambersburg Limestone (Middle Ordovician)

St. Paul Group (New Market and Row Park Limestones, undivided) (Middle Ordovician)

Beekmantown Group

Pinesburg Station Dolomite (Middle Ordovician)

Rockdale Run Formation (Middle and Lower Ordovician)

Stonehenge Limestone (upper part) (Lower Ordovician)

Stoufferstown Member

Conococheague Limestone (Lower Ordovician and Upper Cambrian)

Big Spring Station Member (Upper Cambrian)

Elbrook Limestone (Upper and Middle Cambrian)

Waynesboro Formation (Lower Cambrian)

Chewsville Member

Cavetown Member

Red Run Member

Undivided—Shown in cross section only

Tomstown Formation (Lower Cambrian)

Dargan Member

Benevola Member

Fort Duncan Member

Bolivar Heights Member

BLUE RIDGE PROVINCE

Tomstown Formation (Lower Cambrian)

Carbonaceous phyllite (Lower Cambrian)

Chilhowee Group

Antietam Formation (Lower Cambrian)

Harpers Formation (Lower Cambrian)

Metasandstone

Weverton Formation (Lower Cambrian)

Owens Creek Member

Maryland Heights Member

Quartzite

Buzzard Knob Member

Undivided

Loudoun Formation (Lower Cambrian)

Conglomerate

Phyllite

Catoctin Formation (Neoproterozoic)

Metabasalt

Metasedimentary phyllite

Tuffaceous phyllite

Metarhyolite

Marble

Metadiabase dike (Neoproterozoic)

Metarhyolite dike (Neoproterozoic)

Swift Run Formation (Neoproterozoic)

Marble

Phyllite

Metasandstone and schist

Fauquier Group

Carter Run Formation (Neoproterozoic)

Swains Mountain Formation (Neoproterozoic)

Metamudstone

Boulder conglomerate

Cobbler Mountain Alkali Feldspar Quartz Syenite of the Robertson River Igneous Suite (Neoproterozoic)

Megacrystic metagranite (Mesoproterozoic)

Biotite granite gneiss (Mesoproterozoic)

Pink leucocratic metagranite (Mesoproterozoic)

White leucocratic metagranite (Mesoproterozoic)

Garnetiferous metagranite (Mesoproterozoic)

Quartz-plagioclase gneiss (Mesoproterozoic)

Marshall Metagranite (Mesoproterozoic)

Coarse-grained metagranite (Mesoproterozoic)

Porphyroblastic metagranite (Mesoproterozoic)

Hornblende monzonite gneiss (Mesoproterozoic)

Layered granitic gneiss (Mesoproterozoic)

Charnockitic granite (Mesoproterozoic)

Amphibolite (Mesoproterozoic)

Garnet-graphite paragneiss (Mesoproterozoic)

Quartzite and quartz-sericite tectonite (Mesoproterozoic)

PIEDMONT PROVINCE

Culpeper and Gettysburg Basins

Diabase dikes and sills (Early Jurassic)

Crystalline diabase

High-titanium quartz-normative early cumulates

High-titanium quartz-normative late cumulates

Granophyre

Thermally metamorphosed rocks (Lower Jurassic and Upper Triassic)

Meriden Group

Sander Basalt (Lower Jurassic)

Sandstone and siltstone

Turkey Run Formation (Lower Jurassic)

Conglomerate

Hickory Grove Basalt (Lower Jurassic)

Sandstone and siltstone

Midland Formation (Lower Jurassic)

Conglomerate

Chatham Group

Mount Zion Church Basalt (Lower Jurassic)

Catharpin Creek Formation (Lower Jurassic and Upper Triassic)

Goose Creek Member

Bull Run Formation (Upper Triassic)

Groveton Member

Balls Bluff Member

Leesburg Member

Manassas Sandstone (Upper Triassic)

Poolesville Member

Tuscarora Creek Member

Reston Member

Frederick Valley Synclinorium

Grove Formation (Lower Ordovician and Upper Cambrian)

Upper member

Lower member

Frederick Formation (Upper Cambrian)

Lime Kiln Member

Adamstown Member

Rocky Springs Station Member

Shale

Undivided

Cash Smith Formation (Upper and Middle Cambrian)

Araby Formation (Middle and Lower Cambrian)

Sugarloaf Mountain Anticlinorium and Bush Creek Belt

Urbana Formation (Lower Cambrian?)

Marble

Quartzite

Sugarloaf Mountain Quartzite (Lower Cambrian)

Upper member

Middle member

Lower member

Undivided--Shown in cross section only

Westminster Terrane

Wakefield Marble (Lower Cambrian? and Neoproterozoic?)

Sams Creek Formation (Lower Cambrian? and Neoproterozoic?)

Metabasalt

Felsic schist

Marble

Tuffaceous phyllite

Muscovitic phyllite

Hematitic phyllite

Metalimestone

Quartzite interbedded with phyllite

Quartzite

Metasiltstone

Calcareous metasandstone

Ijamsville Phyllite (Lower Cambrian? and Neoproterozoic?)

Phyllite

Metabasalt

Quartzite

Marble

Metalimestone

Phyllitic conglomerate

Conglomeratic metagraywacke

Chloritic phyllite

Marburg Formation (Lower Cambrian? and Neoproterozoic?)

Metasiltstone

Metagraywacke

Metabasalt

Quartzite

Prettyboy Schist (Lower Cambrian? and Neoproterozoic?)

Metabasalt

Quartzite

Potomac Terrane

Pegmatite (Late Devonian)

Guilford Granite (Late Devonian)

Quartz bodies (Ordovician)

Norbeck Intrusive Suite (Late Ordovician)

Biotite-hornblende tonalite

Quartz gabbro

Ultramafic rocks

Trondhjemite

Kensington Tonalite (Middle Ordovician)

Georgetown Intrusive Suite (Early Ordovician)

Biotite-hornblende tonalite

Quartz gabbro

Metapyroxenite

Dalecarlia Intrusive Suite (Early Ordovician)

Biotite monzogranite and granodiorite

Leucocratic muscovite-biotite monzogranite

Muscovitic trondhjemite

Bear Island Granodiorite (Ordovician?)

Sykesville Formation (Lower Cambrian)

Laurel Formation (Lower Cambrian)

Upper part

Oella Formation (Lower Cambrian and (or) Neoproterozoic)

Loch Raven Schist (Lower Cambrian and (or) Neoproterozoic)

Semipelitic schist and meta-arenite

Northwest Branch Formation (Lower Cambrian and Neoproterozoic)

Mather Gorge Formation (Lower Cambrian and (or) Neoproterozoic)

Quartz-rich schist

Metagraywacke

Migmatite

Phyllonite

Metatuff

Soldiers Delight Ultramafite (Lower Cambrian and (or) Neoproterozoic)

Mafic and ultramafic rocks (Lower Cambrian and Neoproterozoic)

Metagabbro and metapyroxenite (Lower Cambrian and Neoproterozoic)

COASTAL PLAIN PROVINCE

Potomac Formation (Lower Cretaceous)

EXPLANATION OF MAP SYMBOLSContact—Dotted where concealed

Lake bed—Dotted where concealed

FAULTS(Dashed where inferred; dotted where concealed)

Thrust fault—Sawteeth on upper plate

Normal fault—Ball and bar on downthrown side

Reactivated fault—Open ball and bar on downthrown side of early normal fault and sawteeth on upper plate of later thrust fault; shown in cross section as a double-headed arrow

Overturned thrust fault—Bar on upper plate; sawteeth show direction of dip

Strike-slip fault—Arrows show relative movement

Unclassified

Shear zone

PLANAR FEATURES(May be combined with linear features; where features are combined,

intersection of symbols marks point of intersection)

Strike and dip of bedding

Inclined

Overturned

Vertical

Horizontal

Strike and dip of Mesoproterozoic foliation including compositional layering

Inclined

Vertical

Strike and dip of first-generation (S1) Paleozoic cleavage and (or) schistosity

Inclined

Vertical

Strike and dip of second-generation (S2) Paleozoic cleavage and (or) schistosity

Inclined

Vertical

Strike and dip of mylonitic and phyllonitic foliation

Inclined

Vertical

LINEAR FEATURES(May be combined with planar features; where features are combined,

intersection of symbols marks point of intersection)

Bearing and plunge of axis of minor fold

OTHER FEATURES

Location of isotopically dated rock—Sample dated by U-Pb dating techniques

Quarry or mine, active and inactive—Abbreviations are as follows: Ag, silver; Au, gold; C, chromite; Cu, copper; D, diabase; F, hematite, limonite, manganese, and iron ore; L, limestone; M, marble; Pb, lead; S, building stone; Sl, slate; Zn, zinc

Radon in soil gas—Shown where greater than 200 pCi/L (Gunderson and others, 1988)

Small sinkhole—Less than or equal to 50 m2 in diameter

Large sinkhole

L

L

L

LL

LL

L L

L

LL

FL

LL

F

F

FFF

F

F

Zn

L

F

FF

F

F Sl

M

M

S

S

S

Au

M

L

L

L

F

M

L

L

L

L

L

L

L

L

L

L

LL

F

FF

F

L

L

L

Sl

M

M

MM

M

M

L

F

F

Au

L

F F

L

L

LL

M

Cu,Au,Ag

M

M

F

C

Sl

SlSl

LL

F

S

F

S

Sl

F

D

S

SM

D

Cu

DD

S

SSS

S

Cu

SS

S

S

Au

Au

F

S

F

M

M

MM

Cu,AgPb

Cu

Cu,Zn

F

40

56

32

57

5

62

35

16

39

67

16

50 80

545

22

25

30

35

707550

34

72

40

80

54

25

52

60

35

78

74

25

3615

65

15

15

78

45

87

62

68

62

2035

20

6022

6557

56

75

36

4632

13

46

2061

2543 11

18

80

2038

52

253

422

545

20

353553

52

46

47

62

5635

4456

36

60

18

3650

20

66

20

25

32

40

60

23

80

35

60

29

3035

5039

68

23

5862

22

28

56

30

42

24

49

40

70

6510

336

1055

35

50

20

20

17

37

62

42

2534

70

28

46

2

57

43

4515

30

27

13

17 27

40

45

40

3723

36

20

80

65

52

74

78

58

5

63 82

7578

75

58

82

50

42

25

30

12

50

75 40

81

47

35

72

52

64

44

84

60

40

34

3260

2145

45

75

35

15

62

53

60

25

52

48

40

4245

7530

7572 80

21

53

48

1175

56

82

86

72

42

55

20

67

42

62

19

55

50 82

85

60

5982

40

78

70

51

85

40

50

68

67

45

80

78

80

73

62 62

19

55

60 43

34

62

25 50

5255

35

86

54 25

77 7172

61

47

70

68

82

55

25 7082

36

66

10

56

26

62

36

2970

29

524087

85

47

35

35 6328 86

75

75

58

86

67 62

12

34

58

77

88

6883

26

70

7

15

76 82

15

60

50

67

8

8945

82

77

47

77

40

60

48

73

4

12

12

15

14

2

11

8

15

68

35

5

21

15

85

70

60

28

72

60

20

1412

82

73

49

73

45

20

58

18

10

82

12

8

22

2

1567

12

10

18

17

65

22

45

5

36

47

8147

70

78

15

25

12

15

40

17

15

64

5

8

63

83

43

50

7862

25

83

54

86

32

70

28

10

40

78

70

50

77

60

62

2372

51

86

12

12

13

85

208

8233

45

20

32

259

35

37

37

35

35

38

20

40

62

85

81

34

33

27

3142

37

23

79

24

19

50

2047

78

62

85

30

7328

6540

47

51

85

69

40

80

85

70

80

50

478

15

3650

74

41

28

6

32

35 22

32

5

11

1812

5

12

68

70

21

83

5883

31

70

35

45

66

45

74

36

6450

15

26

50

34

28

24

23

56

60

45

70

55

86

17

75

52

73

12

45

67

30

29

55

86

80

8085 50

85

45

58

50

6

66 16

45

5

24

70

45

80

45

33

85

60

30

70

36

13

81

7873

60

75

85

80

80

70

84

75

81

85

38

70

78

85

65

57

3965

85

86

6566

87

74

44

75

75

6

20

83

80

80

8567

60

40

45

38

50

65

67

48

77

60

80

55

70

70

55

6657

80

45

40

55

42

47

50

6075

70

83

68

80

78

43 52

40

60

40

30

57

45

28

16

42

55

65

60

85

72

41

22

10

50

26 25

21

70

3

13

80

51

71

80

20

75

7063

1939

35

58

32

74

26

12

22

25

27

2516

11

26

18

32

83

50

42

75

25

10

44

45

38

25

24

2730

22

53

32

20

24

77

33

26

25

20

18

18

10

12

5

1110

16

11

15

10

10

24

45

25

33

28 30

3424

50

75

33

11

12

21

22

6

10

20

38

22

16

10

20

80

8

47

1980

84

78

62

13

10

72

80

81

81

14

32

20

12

16

17

26

10

1225

70

73

80

7060

80

5550

35

60

80

70

72

60

58

58

75

30

83

45

8070

75

52

6585

75

67

70

60

65

70

80

35 80

45

50

80

77

78

81 65

45

85

80

67

45

80

35

45

75

35

25

15

73

4

47

578

74

45

55

6570

89

16

10

10

85

83

86

30

72

80

67

78

63

85

65

55

73

82

88

84

80

75

75

14

55

35

23

21

75

81

3986

83

16

25

11

20

86

40

6

11

4374

55

63

87

8

65

10

25

77

8050

6850

78

77

80

60

60

65

5040

70

78

16

14

17

7

24

32

13

34

17

15

82

86

12

38

37

44

30

3724

20

24

45

35

15

25

20

27

17

1615

25

20

28

78

8

21

26

10

22 27

29

17

12

12

20

6

13

10

22

2515

7

22

108

20 8

19

60

78

20

4

13

9

8

18

25

10

16

24

12

15

21

6

9

8

15

38

20

16

20

15

36

8

21

12 1020

70

78

75

53

43

18

80

65

6550

15

60

54

30

20

10

16

82

70

70

75

80

70

70

56

80

35

60

60

45

85

80

48

50

12

80

45

80

65

15

64

80

5

15

10

12

31

75

62

7

34

77

80

65

84

36

50

25

32

3

40

51

30

29

20

5

48

15

60

50

40

65

20

25

60

80

10

14

20

10

513

60

74

85

47

76

47

42

50

40

28

35

43

6

36

80

21

18

61

70

15

16

87

30

70

25

80

70

30

70

50

30

48 62

42

30

42 82

45

25

27

70

35

20

55

60

24

67

80

25

35

31

35

78

45

73

50

40

35

58

2574

82

80

35

89

80

35

50

60

55

27

78

22

60

49

48

52

70

80

83

67

67 60

58

62

60

57

40

56

8228 65

75

60

42

52

2380

65

29

1530

45

35

45

45

58

42

40

50

27

57

2237 41

68

32

15

26

34

32

33

31

21

22

2137

86

42

81

63

5432 50

37

3

52

43

81

81

72

82

44

602145

8681

65

82

81

22

45 47

37

33

33

31

30

31

43

323235

42

32

45

46

33

27

43

17

2443 41

49

23

48

33

30

44

47

28

41

18

3531

40

22

32

70

47

79

49

38

16

23

38

6533

25

24

20

23

78

3833

40

25

80

12

40

57

54

50

7963

6330

80

27

60

60

51

28

68

4088

34 9

50

49

20

1563

34

57

33

38

77

75

35

57 77

66

68

75

38

71

5067

40

7257

30

41

23

31

20 3221

21

304932

37

6732

86

3236

30

34

30

36

3442

30

20 67

44

3527

80

758722

2240

243780

41 6111

76

44

3266

45

22

3147

66

40 37 21 78

32

55

85

77

62

28

38

41

53

80

42

44

81

73 75

63

50

2555

8265

60

45 35

2570

6080

45

45

77

81

45

45

60

55

82

30

82

68

50

60

26

50

77

75

35

87

24

53

55

35

80

33

50

20

30

45

70

18

25

26

5725

22

10

88

16

64 41

89

45

431028

26

29

31

175

35

23

20

45 15

36

35

15

20

25

25

80

80 40

70

8030

5220

44

55

27

18

3215

58

55

70

7060

30

54

26

60

86 4

60

34

30

45

80

56

22

32

54

58

52

41

70

20

34

25

20

34

44

70

40

50

47

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U.S. DEPARTMENT OF THE INTERIORU.S. GEOLOGICAL SURVEY

SCIENTIFIC INVESTIGATIONS MAP SIM 2889

Explanatory pamphlet accompanies map

1 10 KILOMETERS0 1 2 43 5 6 7 8 9

SCALE 1:100 0001 8 MILES10 2 3 4 5 6 7

CONTOUR INTERVAL 10 METERSNATIONAL GEODETIC VERTICAL DATUM OF 1929

Base from U.S. Geological Survey, 1984

1983 North American datum

25,000-foot grid ticks based on Georgia coordinate system, west zone

10,000-meter Universal Transverse Mercator grid ticks, zone 16

Geology mapped from 1989 to 1994

Digital compilation by James E. Reddy and Danielle Denenny

Geologic map editing by Elizabeth D. Koozmin

Digital cartography by D. Paul Mathieux

MA

GN

ET

IC N

OR

TH

APPROXIMATE MEANDECLINATION, 2007

TR

UE

NO

RT

H

10 / °1 2

VIRGINIA

MARYLAND

MAP LOCATION

W. VA.

GEOLOGIC MAP OF THE FREDERICK 30' X 60' QUADRANGLE, MARYLAND, VIRGINIA, AND WEST VIRGINIABy

Scott Southworth,1 David K. Brezinski,2 Avery Ala Drake, Jr.,3 William C. Burton,1 Randall C. Orndorff,1 Albert J. Froelich,4 James E. Reddy,1 Danielle Denenny,1 and David L. Daniels3

1U.S. Geological Survey, Reston, Va. 2Maryland Geological Survey, Baltimore, Md. 3U.S. Geological Survey, Retired. 4Deceased.

2007 Printed on recycled paper

This map is available for sale by U.S. Geological Survey, Information Services, Box 25286, Denver Federal Center, Denver, CO 80225

For product and ordering information:World Wide Web: http://www.usgs.gov; Telephone: 1-888-ASK-USGS

Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government