Expert answer:Interpreting Geologic Maps, geology homework help

Answer & Explanation:Using the geologic map of Virginia, answer the following questions:Is the region in the extreme northwest corner to the Potomac River strongly folded or strongly faulted? Is the region from the southeast corner to Harrison Island along the Potomac strongly folded or strongly faulted?In the southwestern part of the map, along the Shenandoah River, the sediments are only Quaternary in age, yet they are surrounded by much older Cambrian sediments.  How do you explain this? In the southeastern corner of the map, locate Rockville and Gaithersburg.  Notice that they are separated by the Plummer’s Island Fault.  Is Rockville moving atop Gaithersburg or is Gaithersburg moving atop Rockville? Find Martinsburg, WV, in the extreme northwest corner.  Now locate Martinsburg, MD, which is just to the to the east of Harrison Island and Mason Island along a bend in the Potomac in the south central area of the map.  Which is surrounded by the older rock? Locate Long Marsh Run just south of the West Virginia/ Virginia border on the southwestern side of the map.  Which way is it flowing?How many different ages of rock would you encounter along its course?In the middle image at the bottom, to the far right, you see that the younger Prettyboy Schist lies beneath the older Mather Gorge Formation.  How can older rock be found atop younger rock? Locate the oval, brown rocks near the center of the map.  What geologic feature is this?geo6.pdf
geo6.pdf

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U.S. DEPARTMENT OF THE INTERIOR
SCIENTIFIC INVESTIGATIONS MAP
U.S. GEOLOGICAL SURVEY
Obps
Osnr
25
63
Obs
50
75
58
70
50
80
40
40
25
L
16
68
75
88
55
|td
27
|td
Obs
Obrr
73
Obps
23
78
84
|e
6
19
74
34
25
60
81
Osnr
39
70
22
3
75
44
Obps
58
Obss
Obrr
Obs
16
35
87
9
81
31
53
82
35
50
20
47
30
45
45
25
64
55
60
Obss
70
45
30
86
45
26
68
60
25
Obs
45
|cb
35
26
77
O|c
|t
QTt
|ch
F
80
50
|ca
20
75
25
|cb
|t 5
70
|wact
|wac
|e
80
40
QTt
85
45
60
45
|ch
21
QTt
|ca
70
|cwo
18
30
|chs
45
40
24
Qa
27
50
80
45
52
|war
20
Qt
70
30
55
55
44
Qt
15
35
|cwo
58
|war
|ch
Qt
QTt
54
60
|ca
50
26
75
|chs
60
|ch
46
Ygt
Qcc
40
|cwo
44
40
15
22
57
|cwm
20
15
Qcc
Zcm
Zrc
60
Zcp
Zss
30
Zrd
70
Zmd
Ya
Qa
Ypb
Qa
Ylg
65
85
Ylg
70
Qa
Yc
53
36
72
70
45
60
45
Yq
65
Jd
15
30
47
Yp
Ygt
Ya
Zmd
Jd Ymc
25
Yp
Qa
Zmd
44
Zfsm
45
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
J^tm
Ql
27
FAULT
OU
NTA
IN
QTt
11
44
27
Qt
65 Qt
|Zmg
Qa
^cbg
QTt S
Jdh
Jdc
Jd
^cbb
22
19
28
24
38
30
Jd
45
30
48
68
45
Qa
55
35
37
23
50
34
35
^cmp
Qa
45
Ob
78
|Zmm
60
50
|Zmg
|Zmg 67
Ob
80
|Zmm
Au
85
Qa
36
Qa
|Zmp
66
55
77
S
Qa
Oq
45
Odl
|Zn
80
SCALE 1:100 000
1
0
1
3
2
6
7
ET IC
N O R TH
TRUE NORTH
MAGN
0
1
3
2
4
5
6
7
10 KILOMETERS
9
8
VIRGINIA
CONTOUR INTERVAL 10 METERS
80
Qcf
Fine colluvium
Qcc
Coarse colluvium
Obrr
SEA LEVEL
Obps
Obrr
Om
|lu
45
67
|cb
O|c
85
Oc
Kps
Osnr
|wa
|cb
2000
3000
|ch |ca
|t
|ch
|ca
|tb |tf
|td
|e
|tbh
Zcm
Ybg
Obps
Zmd
Zrd
Yg
|cwm
|ch
Zcm
|clp
|cwb
^cmp ^cmt
|wa
|ca
|ar
|clp
|uq |uq |uq
|Zsb
|e
|Zsmp
|Zmbq
|Zmbs
|Zms
|Zmbs
STATE ROUTE 97
PLUMMERS ISLAND FAULT
|Zsmp
|Zsb
|u
|uq
|Zsq
|Zsb |Zip
|Zss
|fr
|Zmg
|Zmp
SEA LEVEL
|Zu
|Zsb
|Zsc
|wa
Undivided—Shown in cross section only
Tomstown Formation (Lower Cambrian)
|tb
Zmd
Ymc
Zmd
SEA LEVEL
1000
|chs
|wac
|t
Ypg
|cwm
Yml
Zcma
Zfcr
Zfsm
Ypg
Jdh
J^tm
|Zmg
^cbb
|Zms
^cbb
Jdh
|Zmp
|s
|s
INTERSTATE ROUTE 495
Tomstown Formation (Lower Cambrian)
|cp
Carbonaceous phyllite (Lower Cambrian)
^cbb
^cmp
Zfsc
|Zmbs
^cmr
|Zmbs
Harpers Formation (Lower Cambrian)
|Zu
|s
Ogh
|s
Ok
|l
|lu
Metasandstone and schist
|fr
Rocky Springs Station Member
Fauquier Group
Zfcr
Ogp
Ob
1000
|lu
Swains Mountain Formation (Neoproterozoic)
Zfsm
Metamudstone
Zfsc
Boulder conglomerate
Zrc
Cobbler Mountain Alkali Feldspar Quartz Syenite of the Robertson
River Igneous Suite (Neoproterozoic)
Ypb
Megacrystic metagranite (Mesoproterozoic)
Ybg
Biotite granite gneiss (Mesoproterozoic)
Yml
Pink leucocratic metagranite (Mesoproterozoic)
Yg
Ogh
Quartzite
Garnetiferous metagranite (Mesoproterozoic)
Yqp
Quartz-plagioclase gneiss (Mesoproterozoic)
Ym
Marshall Metagranite (Mesoproterozoic)
|f
Undivided
|Zmp
|Zmt
|Zl
|Zn
Lower Cambrian
and (or)
Neoproterozoic
|Zlm
Ymc
Coarse-grained metagranite (Mesoproterozoic)
Ypg
Porphyroblastic metagranite (Mesoproterozoic)
Yhm
Hornblende monzonite gneiss (Mesoproterozoic)
Urbana Formation (Lower Cambrian?)
|um
Marble
|uq
Quartzite
Sugarloaf Mountain Quartzite (Lower Cambrian)
|squ
Upper member
|sqm
Middle member
|sql
Lower member
|sq
Undivided–Shown in cross section only
|Zw
Sams Creek Formation (Lower Cambrian? and Neoproterozoic?)
|Zsb
Metabasalt
|Zsf
Felsic schist
|Zsm
Marble
|Zshp
Hematitic phyllite
|Zsl
J^tm
High-titanium quartz-normative late cumulates
Granophyre
Thermally metamorphosed rocks (Lower Jurassic and Upper
Triassic)
Jms
Jmss
Jmt
Jmh
Jmhs
Jmmc
Turkey Run Formation (Lower Jurassic)
Conglomerate
Hickory Grove Basalt (Lower Jurassic)
Sandstone and siltstone
Midland Formation (Lower Jurassic)
J^ccg
Conglomerate
|clp
Phyllite
Zcm
Metabasalt
Zcs
Metasedimentary phyllite
Zcp
Tuffaceous phyllite
Zcr
Metarhyolite
4000
Zmd
Mount Zion Church Basalt (Lower Jurassic)
Catharpin Creek Formation (Lower Jurassic and Upper Triassic)
Goose Creek Member
Metarhyolite dike (Neoproterozoic)
Quartz-rich schist
|Zmg
Metagraywacke
|Zmm
Migmatite
|Zmp
Phyllonite
|Zmt
Metatuff
|Zsd
Soldiers Delight Ultramafite (Lower Cambrian and (or)
Neoproterozoic)
|Zu
Mafic and ultramafic rocks (Lower Cambrian and Neoproterozoic)
|Zg
Metagabbro and metapyroxenite (Lower Cambrian and
Neoproterozoic)
Potomac Formation (Lower Cretaceous)
EXPLANATION OF MAP SYMBOLS
Contact—Dotted where concealed
Metalimestone
Lake bed—Dotted where concealed
Quartzite interbedded with phyllite
|Zsq
Quartzite
|Zss
Metasiltstone
Thrust fault—Sawteeth on upper plate
|Zsc
Calcareous metasandstone
Normal fault—Ball and bar on downthrown side
FAULTS
(Dashed where inferred; dotted where concealed)
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
Ijamsville Phyllite (Lower Cambrian? and Neoproterozoic?)
|Zip
Phyllite
|Zib
Metabasalt
|Ziq
Quartzite
|Zim
Marble
Overturned thrust fault—Bar on upper plate; sawteeth show direction of
dip
Strike-slip fault—Arrows show relative movement
Unclassified
|Zil
Metalimestone
|Zic
Phyllitic conglomerate
Shear zone
|Zicm
Conglomeratic metagraywacke
|Zicp
Chloritic phyllite
PLANAR FEATURES
(May be combined with linear features; where features are combined,
intersection of symbols marks point of intersection)
Strike and dip of bedding
32
Marburg Formation (Lower Cambrian? and Neoproterozoic?)
|Zmbs
Metasiltstone
|Zmbg
Metagraywacke
|Zmbb
Metabasalt
|Zmbq
Quartzite
|Zp
Inclined
44
Overturned
Vertical
Horizontal
Strike and dip of Mesoproterozoic foliation including compositional
layering
77
Inclined
Prettyboy Schist (Lower Cambrian? and Neoproterozoic?)
|Zpb
Metabasalt
|Zpq
Quartzite
Vertical
Strike and dip of first-generation (S1) Paleozoic cleavage and (or)
schistosity
47
Inclined
Vertical
Potomac Terrane
Dp
Pegmatite (Late Devonian)
Dg
Guilford Granite (Late Devonian)
Oq
Quartz bodies (Ordovician)
^cbb
Balls Bluff Member
Ong
Quartz gabbro
^cbl
Leesburg Member
Onu
Ultramafic rocks
Ontr
Trondhjemite
Manassas Sandstone (Upper Triassic)
^cmp
Poolesville Member
^cmt
Tuscarora Creek Member
^cmr
Reston Member
Grove Formation (Lower Ordovician and Upper Cambrian)
O|gu
Upper member
O|gl
Lower member
Strike and dip of second-generation (S2) Paleozoic cleavage and (or)
schistosity
60
Inclined
Vertical
Strike and dip of mylonitic and phyllonitic foliation
75
Inclined
Norbeck Intrusive Suite (Late Ordovician)
Biotite-hornblende tonalite
Frederick Valley Synclinorium
Metadiabase dike (Neoproterozoic)
|Zms
Kps
Groveton Member
Marble
Mather Gorge Formation (Lower Cambrian and (or) Neoproterozoic)
COASTAL PLAIN PROVINCE
Ont
^cbg
Northwest Branch Formation (Lower Cambrian and Neoproterozoic)
Conglomerate
Chatham Group
Jcm
Semipelitic schist and meta-arenite
|Zlm
|Zsqp
Sander Basalt (Lower Jurassic)
Sandstone and siltstone
Upper part
Wakefield Marble (Lower Cambrian? and Neoproterozoic?)
Amphibolite (Mesoproterozoic)
High-titanium quartz-normative early cumulates
Laurel Formation (Lower Cambrian)
|Zn
Ya
Jdc
|l
Loch Raven Schist (Lower Cambrian and (or) Neoproterozoic)
|u
Muscovitic phyllite
Crystalline diabase
Sykesville Formation (Lower Cambrian)
|Zl
|Zsmp
Jd
|s
Oella Formation (Lower Cambrian and (or) Neoproterozoic)
Charnockitic granite (Mesoproterozoic)
Culpeper and Gettysburg Basins
Bear Island Granodiorite (Ordovician?)
|Zo
Yc
PIEDMONT PROVINCE
Ob
Araby Formation (Middle and Lower Cambrian)
Tuffaceous phyllite
Quartzite and quartz-sericite tectonite (Mesoproterozoic)
Muscovitic trondhjemite
|ar
|Zstp
Yq
Odt
|lu
Layered granitic gneiss (Mesoproterozoic)
Garnet-graphite paragneiss (Mesoproterozoic)
Leucocratic muscovite-biotite monzogranite
Cash Smith Formation (Upper and Middle Cambrian)
Ylg
Yp
Odl
|cs
Undivided
|clc
Zrd
X
Shale
Westminster Terrane
J^cc
Buzzard Knob Member
Zcma
Ob
White leucocratic metagranite (Mesoproterozoic)
Ygt
Catoctin Formation (Neoproterozoic)
3000
Jd
GEOLOGIC MAP OF THE FREDERICK 30′
Maryland Heights Member
Loudoun Formation (Lower Cambrian)
2000
Ogg
Carter Run Formation (Neoproterozoic)
|frs
Bull Run Formation (Upper Triassic)
2000
SEA LEVEL
|Zms
Ok
LINEAR FEATURES
(May be combined with planar features; where features are combined,
intersection of symbols marks point of intersection)
40
Ogh
Biotite-hornblende tonalite
Ogg
Quartz gabbro
Ogp
Metapyroxenite
Dalecarlia Intrusive Suite (Early Ordovician)
Biotite monzogranite and granodiorite
Bearing and plunge of axis of minor fold
OTHER FEATURES
Location of isotopically dated rock—Sample dated by U-Pb dating
techniques
Kensington Tonalite (Middle Ordovician)
Georgetown Intrusive Suite (Early Ordovician)
Odm
Vertical
L
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
60′ QUADRANGLE, MARYLAND, VIRGINIA, AND WEST VIRGINIA
By
Scott Southworth, David K. Brezinski, Avery Ala Drake, Jr., William C. Burton, Randall C. Orndorff, Albert J. Froelich, James E. Reddy, Danielle Denenny, and David L. Daniels
3
Zss
Owens Creek Member
|cwb
1000
|Zmt
2
Adamstown Member
Jmm
Metasandstone
|cwmq
NO VERTICAL EXAGGERATION
1
|fa
Jmtc
Antietam Formation (Lower Cambrian)
|cw
Silver Spring
|s
Ogh
|Zu
|Zms |Zmg
Jdc
|Zmm
|Zmp
|Zmm
|Zu
|ch
1000 meters = 3281 feet
Surficial deposits are not shown
^cbb
|Zmg
|Zu
|Zms |Zmg
|Zms
Cabin John Creek
WASHINGTON AND OLD
DOMINION RAILROAD
REGIONAL TRAIL
Broad Run
^cbg
Jd
^cmr
^cmp
J^tm
Jdg
J^ccg
^cbb
J^tm
LT
U
FA
|ca
Ylg
Yp
Yp
Yq
Yp
Jd
Jdh
VE
O
GR
4000
|cwo
Jdh
J^tm
T
|war
J^cc ^cbb
Phyllite
Jdg
|t
|cwm
METERS
3000
AN
|ch
J^cc J^ccg
Jcm
Jmm
J^tm
Yp
|ca
|wact
Zcm
Ym
Zcp
|cw
S
EA
PL
3000
Ylg
Yc
|t
2000
Zmd
Yml
|ch
O|c
Ym
Zmd
INTERSTATE ROUTE 495
Zmd
Ogh
ROCK CREEK SHEAR ZONE
Yq
Zmd
PLUMMERS ISLAND FAULT
Zss
STATE ROUTE 190
|cwb Zcm Zcp
STATE ROUTE 7
|cwm
|cwo
|ch
Zsp
Benevola Member
BLUE RIDGE PROVINCE
4000
INTERSTATE ROUTE 495
|t
|ca |chs
INTERSTATE ROUTE 270
|e
|ca
|war
|wac
|cb |wact
|e
|e |e
Lime Kiln Member
Jdh
3000
B’
J^tm
|Zmg |Zmm
Frederick Formation (Upper Cambrian)
|fl
Bolivar Heights Member
|cwo
Ogg
|Zms
Meriden Group
POTOMAC TERRANE
|Zmg
|Zg
Neoproterozoic
Marble
Dargan Member
Fort Duncan Member
|tf
1000
|Zp
|Zms
|Zmg
|Zu
Zsm
Diabase dikes and sills (Early Jurassic)
Weverton Formation (Lower Cambrian)
|Zmg
Swift Run Formation (Neoproterozoic)
2000
POTOMAC RIVER
|cb
J^cc
1,153±6 Ma
Elbrook Limestone (Upper and Middle Cambrian)
Chilhowee Group
Sugarland Run
1000
Zcm Zss
Goose Creek
CATOCTIN
MOUNTAIN
2000
BULL RUN MOUNTAIN FAULT
U.S. ROUTE 15
3000
Ylg*
Big Spring Station Member (Upper Cambrian)
|tbh
CULPEPER BASIN
Black Oak Ridge
4000
1,149±19 Ma
Conococheague Limestone (Lower Ordovician and Upper Cambrian)
Red Run Member
PIEDMONT PROVINCE
SHORT HILL FAULT
BLUE RIDGE
B
SHENANDOAH
RIVER
METERS
Yhm*
Stoufferstown Member
|chs
BLUE RIDGE-SOUTH MOUNTAIN ANTICLINORIUM
|Zo
|Zsd
Mesoproterozoic
Stonehenge Limestone (upper part) (Lower Ordovician)
|war
|ch
GREAT VALLEY SECTION
1,144±2 Ma
Rockdale Run Formation (Middle and Lower Ordovician)
Cavetown Member
4000
BLUE RIDGE PROVINCE
Ypg*
Pinesburg Station Dolomite (Middle Ordovician)
|wact
|ca
VALLEY AND RIDGE PROVINCE
|Zpb
|Zmbs
|Zmbq
|Zp
|Zsqp
|Zpq
|Zsq
Sugarloaf Mountain Anticlinorium and Bush Creek Belt
Chewsville Member
NO VERTICAL EXAGGERATION
1000 meters = 3281 feet
Surficial deposits are not shown
1,140 Ma
St. Paul Group (New Market and Row Park Limestones, undivided)
(Middle Ordovician)
|td
|s
|Zsb
Zcm Yhm
|Zmbg
Yq
|wac
|t
1000
|Zsb
|sq
Ymc*
Waynesboro Formation (Lower Cambrian)
METERS
2000
|Zsb
|sq
|Zmbb
Chambersburg Limestone (Middle Ordovician)
3000
|Zmbq
Zcm
|ca |ch
|cw
Monrovia
|Ziq
|Zip
|u
Yhm
|ch
BARNESVILLE-MONROVIA
THRUST FAULT
MARTIC FAULT
SUGARLOAF MOUNTAIN
ANTICLINORIUM
MARTIC FAULT
Monocacy River
INTERSTATE ROUTE 270
MARTIC FAULT
|Zip
|fa
|cw
|t
|t
Jd
|ar
^cbl
Zcm
|fr
|frs
|ca
|cwm
|cwb |clc
|cwb
|fa
|fr
POTOMAC TERRANE
PLEASANT GROVE FAULT
Zrd
INTERSTATE ROUTE 70
CATOCTIN MOUNTAIN
Catoctin Creek
SOUTH MOUNTAIN
Zsm
Yg
|cwo
Zcr
|cwm
|cwo
|wa
|e |cb
|cw
Zcm
|tbh
|e
O|c
|t
|ca
|frs
|fr
1,111±2 Ma to
1,112±3 Ma
Beekmantown Group
4000
HYATTSTOWN THRUST FAULT
|wac
|e
|wact
|war
|td
Obss
Obss
BLUE RIDGE
KEEDYSVILLE FAULT
Antietam Creek
Sharpsburg
|e
O|gl
O|gu |fl
|Zsmp
PROTEROZOIC
Martinsburg Formation (Upper and Middle Ordovician)
|cb
INTERSTATE ROUTE 70
|cb
O|c
|ch
Ym*
Great Valley Section
A’
|Zsb
1,077±4 Ma
Terrace deposit, high level (Pleistocene and Tertiary)
T
RN
Ogh
WESTMINSTER TERRANE
Bush Creek
Obs
|ca
|chs
|ch
|war
Ybg
Zss Zmd
Frederick
Oc
Om
Obs
4000
POTOMAC
RIVER
Rockymarsh Run
Osnr
Oc
Om
Obps
|e
1000
Obss
Yqp*
VALLEY AND RIDGE PROVINCE
Obrr
FREDERICK VALLEY SYNCLINORIUM
U.S. ROUTES 15 AND 340
|cb
O|c
Osnr
Oc
STATE ROUTE 67
|cb
O|c
|e
BULL RUN MOUNTAIN FAULT
1000
Opequon Creek
2000
Opequon Creek
3000
U.S. ROUTE 11
INTERSTATE
ROUTE 81
4000
MASSANUTTEN SYNCLINORIUM
A
STATE ROUTE 9
METERS
CULPEPER BASIN
1,077±4 Ma
Lag gravel (Holocene and Pleistocene)
|l
PIEDMONT PROVINCE
BLUE RIDGE-SOUTH MOUNTAIN ANTICLINORIUM
|Ziq |Zshp
|Zsl
Dp
O|c
GREAT VALLEY SECTION
Ygt*
Residuum (Holocene and Pleistocene)
Obss
BLUE RIDGE PROVINCE
1,060±2 Ma
Terrace deposit, low level (Holocene and Pleistocene)
Obs
VALLEY AND RIDGE PROVINCE
Yg*
Qt
QTt
MAP LOCATION
NATIONAL GEODETIC VERTICAL DATUM OF 1929
APPROXIMATE MEAN
DECLINATION, 2007
1,059±2 Ma
Alluvium (Holocene)
Ql
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
8 MILES
W. VA.
1
57
B’
MARYLAND
5
4
Yml*
83
60
80
25
FA
Jmh
101/2°
1,055±4 Ma
Qa
Qr
Dg
T
|lu
62
77
|Zmp Ogp
Dg
Dp
35
Ok
40
65
|Zl
38
Qa
Ogg
Oq Odm
80
Ybg*
Colluvium (Holocene and Pleistocene)
Dp
S
50
Ogp
|Zu
Ok
60
80
78
S
S
48
Ok
50
|Zmp Ogh
75
50
45
35
65
68
40
50
45
Oq
|Zmp
60
42
67
70
47
50
40
Ok
50
85
|Zmt
|Zms
|Zmg
50
80
|Zmm Qa
8
10
33
|Zmp
1,055±2 Ma
UNCONSOLIDATED SURFICIAL MATERIALS
25
Ok
Ont
75
45
15
77
65
45
35
Oq
80
|Zmp
65
60
Qa
55
67
3 65
43
25
|Zu
Ob
80
|Zu
|Zmp
Ob
85
Ogh
Ypb*
Qa
60
Ont
80
|s
40
65
70
Ong
57
722±3 Ma
[Map units are shown generally from west to east. For descriptions, please see
accompanying text pamphlet.]
Ok
55
Ont
|Zss
|Zw
|Zsb
|Zsc
|Zsf
Ya
Yp
30
70
Oq
Au
55
80
75
Ont
Ont
Zrc*
LIST OF MAP UNITS
60
52
78
80
60
|Zic |Zstp
Qa
60
40
70
83
70
|Zmg
80
Ok
|s
83
|Zmp
Stratified rocks
|Zsm
|lu
|Zl
Ont
43
55
80
60
Onu
68
80
73
|Zmg
36
|Zmm
Ont
80
75
|Zib
|Zil
Zrd*
|Zicm
|l
Yc
Ok
35
Ont
Ong
Qa
45
Au
70
7
40
Ont
42
60
|Zicp
|s
571.5±5 Ma
45
Ok
Oq
Odm
Oq
Ong
|Zmg
WESTMINSTER TERRANE
|sqm
50
Onu
Ong
|Zmp
78
65
85
27
37
40
J^tm
Jd
27
83
78
20
|Zu
8
33
^cbb
56
50 45
70
|s
80
22
40
Qa
77
|Zmm
|Zu
|Zms
40
45
15
^cmr
S
17
13
30
40
10
8
21
Ql
J^cc
73
Jd
Jd
Jdh
45
QTt
|Zu
Qa
80
70
32
43
17
25
24
50
55
47
Qa
QTt
12
22
75
|Zu
|Zmg
45
10
20
J^tm
35
43
20
37
Jmss
10
S S S
14
20
^cbb
77
Jd
QTt
Qa
Qt
|Zu
85
|Zms
30
Oq
S
42
45
20
50
7
Jdc
|Zmg
35
15
15
30
S
Jms
36
25
^cmr
Qcc
J^ccg
Qa
|cw
Zcp
Zcma
^cmp
85
Zss
Ont
80
65
81
Zsp
Zmd
45
35
75
70
Zsm
Zfsc
Zfsm
Stratified rocks
Intrusive rocks
16
Ont
Ong Odt
Qa
80
|Zmp
Zcp Zcr*
Zcma Zcm
Zfcr
|u
|Zip
|Zim
70
56
35
85
Qa
|Zmg
^cmr
8
14
30
Qt
Qa
16
Qa
24
Jdh
24
Jdg
Qcf
Jmtc
Ylg
Yp
13
6
J^tm
30
25
Qa
10
10
Jd
S
Qcc
22
9
13
37
55
30
Zmd
50
50
45
50
78
20
Ymc
Yq
74
45
Zfsc
Zfsc
28
D
38
|cw
Jmt
51
M
30
Zfsm
Ypg
15
70
57
Qt
25
J^cc
46
Zfcr
11
^cbb
45
43
80
50
Jmm
Jmmc
39
40
60
Qa 36
48
QTt
Jd
35
7
10
6
Zcs
Lower Cambrian
600 Ma
Ont
|s
80
|Zmp
15
Lower Ordovician
CAMBRIAN
|sql
54
60
Ont
70
65
80
47
84
|sq
20
70
|Zmm
80
Odt
Middle Cambrian
|squ
10
Ontr
|Zu
50
Cu
J^cc
24
Jd Jmhs
Zcma
8
82
|s
75
75
70
70
40
Jd
Ob
85
80
25
Jmh
Zcp
35
61
68
Jd
45
45
Zmd
15
65
65
80
Qt
16
79
Odl
|cwmq
|Zo
|Zlm
Oq
60 45
60
|Zmg
Ob
Odm*
478±6 Ma
Upper Cambrian
|cwm
75
65
70
38
36
5
83
Ob
|Zmg
25
28
^cmr
70
55
|Zg
^cbb
Qa
Jdg
70
13
16
J^tm
Jcm
48
15
65
Ong
Oq
80
Qa
Ob
Lower Ordovician
and Upper Cambrian
|uq
30
15
|Zu
60
|Zu
80
Qa
45
85
72
64
Oq
|Zu
|Zu
48
85
Qa
72
74
85
10
15
|Zms
Ont
Ont
39
47
10
76
Ogp
?
|um
|chs
|cw
|Zl
Fauquier
Group
Ont
65
ORDOVICIAN
52
70
64
Ogg
472±4 Ma
Middle Ordovician
Stratified rocks
35
53
65
|Zu
Oq
SUGARLOAF MOUNTAIN
ANTICLINORIUM AND
BUSH CREEK BELT
|clp
80
|Zmg
60
Ob
|frs
|clc
60
Oq
50
52
|Zmbg
21
4
D
D
20
35
60
6
Qt
Jdc
J^ccg
3
8
|Zu
Ogh*
|cwb
58
65
|Zu
88
58
64
45
Chilhowee
Group
|Zsd
80
Oq
85
60
70
70
71
Jd
^cmp
Jd
D
|cw
Yg
57
Yq
45
78
Yml
26
62
38
9
|cp
39
70
Qa
55
43
83
|tbh
|ch
Qa
83
?
?
|ca
73
60
60
78
70
|Zu
67
18
80
|t
|s
55
70
84
|Zu 75
Stratified rocks
|tf
58
|Zmg
|Zmp
30
80
|tb
75
75
80
85
75
20
24
32
60
|Zu
|Zu
57
50
72
80
|Zmg
78
80
|Zmbs
50
?
|td
75
67
|Zmg
Upper Ordovician
Ontr
|wact
85
70
75
58
75 76
65
Qa
Qa
55
83
12
25
^cbb
|Zmbq
|Zmbg
5
QTt
20
Cu
17
Qcc
Yg
35
J^tm
Jdg
15
47
Ym
84
78
Ya
27
50
87
62
40
Jdc
27
48
60
Ygt
Zmd
Yp
50
75
Qa
Zcp
60
Qa
60
68
85
40
Qa
10
65
15
58
Zss
5
15
Qcc
Qcc
Zcp
Zcr
60
56
|cwb
55
20
35
20
28
Ypg
31
50
75
Yp
^cbb
80
|Zmbq
QTt
Qa
80
8
18
65
80
20
47
80
Yp
22
36
42
Zmd
Zmd
Ypg
15
70
Zcp
25
56
|chs
40
34
4
10
45
Qa
Jd
52
54
Jd
20
55
Zcm
Zmd
23
Qcf
10
|Zmbq
20
Qt
22
88
25
19
16
|cwb
34
65
60
35
25
Jd
45
Zcp
65
58
20
QTt
75
|wa
80
43
|Zmg
80
70
|Zmbq
35
73
21
55
81
60
Qt
Jdh
Qcc
Yg
25
35
20
Yg
Ylg
Jd
Ymc
Yq
15
45
38
Qcc
15
47
70
Zcm
27
46
Yp
^cbl
82
QTt
Qt
16
15
Ym
10
32
78
25
Qcc
Zcma
50
53
Zmd
Ylg
74
15
35
Jd
QTt
80
80
Qa
15
^cbb
67
64
Qa
|Zmbq
24
14
78
70
70
Ql
Qt
45
35
40
Ygt
30
52
Zcp
Yg
|Zmbb
15
20
20
|Zmbq
|wac
|Zmg
80
DEVONIAN
|ar
Qa
Qa
|Zu
Upper Devonian
|war
75
81
|Zmbq
42
Qa
63
60
45
Onu
|cs
|e
55
Ob
Ob
|Zmg
|Zmm
53
50
32
Qa
|Zmbq
5
QTt
25
28
43
70
Zcr
6
86
36
16
10
68
|t
|ca
|cwb
66
|cwm
30
65
25
42
80
80
67
^cmr
Jd
62
70
64
80
Ong
362±3 Ma
|fa
|cwo
70
75
|Zmbq
73
83
QTt
30
Zss
47
Zcs
Qa
36
48
62
36
15
20
Yp
35
72
M
46
M
40
34
Qcc
Jd
Zsm
Zcm
35
Yp
30
Qcc
60
Qcc
62
40
70
…
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