Georgian Bay

69

529

559

529A

644

Northern

Little WilsonLake

WiwassasegenLake

LittlesBackLake

HeadquartersLake

Bayfield

Island

TimberWolfLake

Shawanaga Inlet

LostTowerLake

Long MooseLake

Middle

Black

SpectacleLake

Lake

LoneTreeLake

CranberryLake

HorseshoeLake

Norgate Inlet

Charles Inlet

Sullivan Lake

Lake

South Branch

GraniteLake

KibeongLake

GrandpaLake

GraniteLake

Sturgeon

BreweryLake

LakeHarris Lake

Lake

WilsonLake

TurtleLake

DoctorLake

SeeseeLake

Oberlin Bay

Sucker Lake

Island

Lake

MooseLake

Rainy

RavenLake

BirchLake

OxbowLake

SkunkLake

ArgueLake

Evans Lake

PikeLake

BirdLake

OwlLake

Tea Lake

LogLake

Miner

Lake

Big Deep B

ay

PikeLake

Giroux

Gordon

Miskokway

MileSix

Six Mile Lake

Alexander Passage

Harbour

Bay

Long Lake

Oak LakeLake

Rock

Shawanaga River

Channel

Lake

Shaw

anag

a In

let

Black

Bill

Islands

Big

Burnt

Island

Gibraltar

Island

Pentecost

Island

Shawanaga

O'Brien Islands

Meneilly

Island

Lookout

Island

Jergens

Island

Rathlyn

Pollard

Island

Barclay

Island

Tonches

Carolyn

Island

Norgate

Foster

Island

Island

Sasega

Olwyn

Burnt

Skunk

Island

Laird Rocks

Olga

Island

Head

Island

Rocks

Island

Big

wo

od I

sla

nd

Island

Island

Island

Island

Nadeau

Island

Magnetawan River

Giroux R iver

Harris R

iver

Naiscoot River

Naiscoot River

Naiscoot River MiddleChannel

Naisc ootCh annel

River South

NaiscootRiver

North Channel

Sucker Creek

Dogfish River

Shawanaga River

6

4

5

5

9

8

8

6

8

5

3

5

8

3

5

4

5

8

8

1

4

5

9

8

4

5

5

6

5

9

4

4

5

1

2

5

5

5

5

6

8

5

4

9

9

8

5

2

3

3

5

5

5

3

6

8

8

4

6

3

2

6

5

3

8

5

8

4

10

65

73 85

15

82

72

82

77

65

23

75

25

10

48

7551

63

66

35

33

84

51

8085

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35

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60

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68

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10

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12

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6a

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6b

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1

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10

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6b

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48a

52b

55

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10

52a

52b

55

10

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7b

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14

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7a

7b

7b

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50a

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14

49

14

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8

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4c

52a

4a

4a

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50a

50a

50a

50a

50a

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5

5

5

5

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1

4a

4a

4a

5

4b

4b

4b

4b4b

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50b

50b

50a

50a

50b

50b

50b

50b

50b

50b

50b

50b

50b

50b

50b

50b

50b

50b

50b

50b

50b

850b

5

5

5

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4a

4a

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4a

8

8

8

8

8

8

8

8

7b

7b

7b

7b

7b

7b7b

7b

7b

7b

7b

7b7b

7b

7b7b

7b

7b

7b

7b

7b

7b

7b

7a

7a

7a

7a

7a

7a

7a

7a

7a

7a

7a

7a

48a

48a

7b

7b

7b

8

8

8

8

8

8

8

8

6a

6a

6a

6a

6a

7b

7b

7b

7b

7b

7b

49

49

49

49

49

49

12

1249

49

49

11

14

14

1414

14

14

14

14

14

14

14

14

14

14

14

14

14

14

14

14

14 9

9

950a50a

50a

50b

50b

19b

19b

50a

9

23

9

9

9

50a

11

52b

52b

52b

52b

52b

52b

52b

52b

8

8

8

8

8

52b

19b

19b

19b

11

11

11

52b

7b

7b

7b

7b

7b

50b

7b

50a

Niweme

Burton

Manbert

Naiscoot

Shawanaga

Skerryvore

Harris Lake

Island

Bayfield

Inlet

Georgian

Inlet

Pointe au Baril

South

Magnetawan

North

Magnetawan

Shawanaga

Landing

Pointe au Baril

Station

Ojibway

tU 966

tU 958

tU 961tU 985tU 1049

tU 1008

zU 1050dU 1152 ± 2

tU 1028

tU 1000

tU 1005tU 1024

tU 1000tU 1004

zU 1114

mA 904 ± 3bA 948 ± 5hA 964 ± 5

mA 896 ± 6

mA 904 ± 6

hA 974 ± 5

mA 899 ± 6

zU 1452 ± 2

zU 1448 ± 1

tU 998 ± 15tU 1430 ± 17

zU 1457 ± 8

wR 1752 ± 95

nU 1053 ± 2nU 1062 ± 2gU 1396 ± 6gU 1435 ± 2gU 1450 ± 1

gf

gf

gf

felfel

felfel

St gn

SHAWANAGAI.R. 17

MAGNETAWAN I.R. 1

NAISCOUTAINGI.R. 17A

NAISCOUTAINGI.R. 17B

MAGNETAWAN I.R. 1

ROUND LAKEPROVINCIAL

NATURE RESERVE

STURGEON BAYPROVINCIAL PARK HARRISON TP

WALLBRIDGE TP

BURTON TP

SHAWANAGA TP

BROWN TP

EAST BURPEE TP

CARLING TP

522000m 23 24 25 26 27 28 29 530000m 31 32 33 34 35 36 37 38 39 540000m 41 42 43 44 45 46 47 48 49 550000m 51 52 53 54 55 56 57 58 59 560000m 61 62 563000m

5066000m

65

64

63

62

61

5060000m

59

58

57

56

55

54

53

52

51

5050000m

49

48

47

46

45

44

43

42

41

5040000m

39

563000m6261560000m595857565554535251550000m494847464544434241540000m393837363534333231530000m29282726252423522000m

39

5040000m

41

42

43

44

45

46

47

48

49

5050000m

51

52

53

54

55

56

57

58

59

5060000m

61

62

63

64

65

5066000m

45°45´00 �

80°43´40 � 40´ 35´ 30´ 25´ 20´ 15´ 80°10´58 �

40´

35´

45°30´00 � 80°10´55 �15´20´25´35´ 30´80°43´44 � 40´

45°45´00 �

40´

35´

45°30´00 �

:

Ontario Geological Survey MAP P.3549 PRECAMBRIAN GEOLOGY

NAISCOOT AREA

NTS Reference: 41 H/9, 10

©

Queen's Printer for Ontario, 2004.

This map is published with the permission of the Director, Ontario

Geological Survey.

Mapping was conducted as part of a three-year

mapping program, Project C.2.3, Georgian

Bay Geological Synthesis, funded as part of

the five-year Canada�Ontario 1985 Mineral

Development Agreement (COMDA), a

subsidiary agreement to the Economic and Regional Development

Agreement (ERDA) signed by the governments of Canada and Ontario.

Scale 1:50 0001000 m 0 1 2 km

35

35

35

1 cm equals 25 kmLocation Map

35

35

SOURCES OF INFORMATION

Thematic information on this map is tied to a digital base map derived

from maps 41 H/9 and 10 of the National Topographic System, scale

1:50 000. Universal Transverse Mercator (UTM) co-ordinates are in

North American Datum 1983 (NAD83), Zone 17.

Geological Survey of Canada�Ontario Department of Mines 1965.

Aeromagnetics, Pointe-au-Baril; Geological Survey of Canada�Ontario

Department of Mines, Geophysical Map 1497G, scale 1:63 360.

Geological Survey of Canada�Ontario Department of Mines 1965.

Aeromagnetics, Naiscoot River; Geological Survey of Canada�Ontario

Department of Mines, Geophysical Map 1507G, scale 1:63 360.

Ontario Geological Survey 2002. Mineral Deposit Inventory Version 2

(MDI2) � October 2002 Release; Ontario Geological Survey, Digital Data.

Culshaw, N.G., Corrigan, D., Drage, J. and Wallace, P. 1988. Georgian

Bay geological synthesis: Key Harbour to Dillon, Grenville Province of

Ontario; in Current Research, Part C, Geological Survey of Canada,

Paper 88-1C, p.129-133.

Culshaw, N., Reynolds, P.H. and Check, G. 1991. A 40

Ar/39

Ar study of

post-tectonic cooling in the Britt domain of the Grenville Province,

Ontario; Earth and Planetary Science Letters, v.105, p.405-415.

Heaman, L.M. and LeCheminant, A.N. 1993. Paragenesis and U-Pb

systematics of baddeleyite (ZrO2); Chemical Geology, v.110, p.95-126.

Ketchum, J.W.F., Heaman, L.M., Krogh, T.E., Culshaw, N.G. and

Jamieson, R.A. 1998. Timing and thermal influence of late orogenic

extension in the lower crust: a U-Pb geochronological study from the

southwest Grenville orogen, Canada; Precambrian Research, v.89,

p.25-45.

Ketchum, J.W.F., Jamieson, R.A., Heaman, L.M., Culshaw, N.G. and

Krogh, T.E. 1994. 1.45 Ga granulites in the southwestern Grenville

Province: geologic setting, P-T conditions, and U-Pb geochronology;

Geology, v.22, p.215-218.

Krogh, T.E. and Davis, G.L. 1969. Geochronology of the Grenville

Province; Carnegie Institution of Washington, Yearbook 67, p.224-230.

Krogh, T.E. and Davis, G.L. 1970. Metamorphism 1700±100 m.y. and

900±100 m.y. ago in the northwest part of the Grenville Province in

Ontario; Carnegie Institution of Washington, Yearbook 68, p.308-309.

Krogh, T.E. and Davis, G.L. 1970. Isotopic ages along the Grenville

Front in Ontario; Carnegie Institution of Washington, Yearbook 68,

p.309-313.

Krogh, T.E. and Davis, G.L. 1971. Paragneiss studies in the Georgian

Bay area 90 km southeast of the Grenville Front; Carnegie Institution of

Washington, Yearbook 69, p.339-341.

Reynolds, P.H., Culshaw, N.G., Jamieson, R.A., Grant, S.L. and

McKenzie, K. 1995. 40

Ar/39

Ar traverse - Grenville Front Tectonic Zone

to Britt Domain, Grenville Province, Ontario, Canada; Journal of

Metamorphic Geology, v.13, p.209-221.

Tuccillo, M.E., Mezger, K., Essene, E.J. and van der Pluijm, B.A. 1992.

Thermobarometry, geochronology and the interpretation of P-T-t data

in the Britt domain, Ontario Grenville orogen, Canada; Journal of

Petrology, v.33, p.1225-1259.

van Breemen, O., Davidson, A., Loveridge, W.D. and Sullivan, R.D.

1986. U-Pb zircon geochronology of Grenvillian tectonites, granulites

and igneous precursors, Parry Sound, Ontario; in The Grenville

Province, Geological Association of Canada, Special Paper 31, p.191-

207.

Magnetic declination approximately 10°29'W in 2004.

Geology not tied to surveyed lines.

Metric conversion factor: 1 foot = 0.3048 m.

CREDITS

Geology by N.G. Culshaw, D. Corrigan, J.W.F. Ketchum, P. Wallace and

N. Wodicka, 1987 to 1990.

Geological compilation by N.G. Culshaw, 1991 and 2004.

Digital drafting by S. Josey.

Geology, legend and mineral deposit information reviewed by

R.M. Easton.

Cartographic production by S. MacLean.

To enable the rapid dissemination of information, this map has not

received a technical edit. Discrepancies may occur for which the

Ontario Ministry of Northern Development and Mines does not assume

liability. Users should verify critical information.

Issued 2004.

Information from this publication may be quoted if credit is given. It is

recommended that reference to this map be made in the following

form:

Culshaw, N.G., Corrigan, D., Ketchum, J.W.F., Wallace, P. and

Wodicka, N. 2004. Precambrian geology, Naiscoot area; Ontario

Geological Survey, Preliminary Map P.3549, scale 1:50 000.

SYMBOLS Compositional

layering and/or

parallel tectonic

foliation;

unknown generation

(trend only, inclined,

vertical)

Lineation (with plunge,

subhorizontal)

Fold axis; minor fold,

s-asymmetry

(with plunge)

Fold axis; minor fold,

z-asymmetry

(with plunge)

Fold axis; minor fold,

m-asymmetry

(with plunge)

Geological contact

(interpreted)

Limit of mapping;

denotes limits of area

mapped during this

survey

Fault, interpreted;

trend only

Allochthon boundary

thrust, interpreted;

trend only, teeth on

hanging-wall side

Antiform, interpreted;

unknown generation,

trend only, limbs dip

in opposite directions

Synform, interpreted;

unknown generation,

trend only, limbs dip

in opposite directions

Mineral occurrences,

prospects,

discretionary

occurrences

(as classed by the

Mineral Deposit

Inventory (MDI))

Location of isotopic

age determination

bA = biotite Ar/Ar date, in Ma

hA = hornblende Ar/Ar date, in Ma

mA = muscovite Ar/Ar date, in Ma

wR = whole rock Rb/Sr date, in Ma

aU = allanite U/Pb date, in Ma

dU = baddeleyite U/Pb date, in Ma

gU = garnet U/Pb date, in Ma

nU = monazite U/Pb date, in Ma

tU = titanite U/Pb date, in Ma

zU = zircon U/Pb date, in Ma

ABBREVIATIONS

fel

gf

St gn

............................................................feldspar

............................................................graphite

..............................................stone, gneiss

bA 978 ± 6

LEGENDabc

PHANEROZOIC

CENOZOIC

QUATERNARY

RECENT Lake, stream and swamp deposits

PLEISTOCENE

Glacial deposits; sand and gravel, clay

and till

UNCONFORMITY

PALEOZOIC

ORDOVICIAN

MIDDLE ORDOVICIAN

Chemical Sedimentary Rocks Unsubdivided: includes Gull River Formation (light brown-

grey to blue-grey interbedded limestone and dolostone,

grey to white sublithographic to lithographic limestone)

and Shadow Lake Formation (calcareous red and green

arkosic sandstone, pebbly sandstone, siltstone and shale)

UNCONFORMITY

PRECAMBRIAN

NEOPROTEROZOIC

Mafic Intrusive Rocks (Grenville diabase dike swarm) (590 Ma) Brown weathering, fine- to medium-grained diabase

INTRUSIVE CONTACT

MESOPROTEROZOIC

HIGH-GRADE METAMORPHISM WITHIN THE GRENVILLE PROVINCE

Mafic Rocks 54a Weakly foliated to gneissic mafic rocks of unknown

protolith and of varied age, subjected to eclogite

facies metamorphism and variably retrogressed

54b Unit 54a, with associated anorthosite and gabbro pods

and slivers

Mafic Intrusive Rocks, Coronitic Metagabbro Suite (circa 1165 Ma) Dark green to black, weakly foliated to gneissic, medium- to

coarse-grained, locally ophitic textured, metagabbro

INTRUSIVE CONTACT

"SINGLE CYCLE PLUTONIC ROCKS", VARIABLY DEFORMED AND MIGMATITIC ORTHOGNEISS, COMMONLY CONTAINING GARNET

Felsic Intrusive Rocks 52a Pink, leucocratic granite, locally potassium feldspar

megacrystic

52b Unit 52a, with associated granite and quartz monzonite,

commonly potassium feldspar megacrystic

52c Unit 52a, strongly foliated to protomylonitic

Felsic to Intermediate Intrusive Rocks 51a Weakly foliated to gneissic, pink monzonite, minor

syenite

51b Unit 51a, with associated granite and monzonite

Intermediate to Felsic Intrusive Rocks 50a Weakly foliated to gneissic, grey hornblende-biotite

granodiorite, locally potassium feldspar megacrystic,

minor tonalite

50b Unit 50a, with associated pink granite and grey

granodiorite

Intermediate Intrusive Rocks Weakly foliated to gneissic, grey tonalite with associated

granodiorite and monzodiorite

Mafic Intrusive Rocks 48a Weakly foliated to gneissic metagabbro, primary

igneous texture commonly preserved

48b Hornblende diorite, gabbro

48c Small outcrops of unit 48a or 48b hosted by adjacent

country rock units (indicated by dots)

Mafic Intrusive Rocks, Anorthosite Suite 47a Anorthosite, gabbroic anorthosite, minor gabbro

47b Weakly foliated to gneissic, mafic intrusive complex

consisting of gabbro, anorthosite and ultramafic rocks

47c Small outcrops of unit 47a or 47b hosted by adjacent

country rock units (commonly found along

tectonostratigraphic boundaries) (indicated by triangles)

EARLY MESOPROTEROZOIC to LATE PALEOPROTEROZOIC

INTRUSIVE CONTACT

ALLOCHTHON

Moon River Subdomain (units 42 to 46) Moon River Gneiss Association (units 44 to 46) Felsic to Intermediate, Layered or Migmatitic Rocks 46a Pink, sugary, layered leucocratic gneiss

46b Grey, migmatitic layered gneiss

Intermediate to Felsic Rocks Grey, migmatitic tonalite to granodiorite orthogneiss

Mafic and Metasedimentary Rocks 44a Mafic orthogneiss

44b Amphibolite

44c Interlayered amphibolite, semi-pelitic gneiss and

quartzite

44d Quartzite

Blackstone Lake Gneiss Association (units 42 and 43) Intermediate to Felsic Rocks 43a Pink, sugary, layered leucocratic gneiss

43b Grey biotite leucogneiss of granodioritic composition

Mafic Rocks Amphibolite

TECTONIC CONTACT WITH SUBJACENT PARRY SOUND DOMAIN (INTERIOR)

Parry Sound Domain (interior) (units 36 to 41) Felsic Rocks Buff to pink weathering, leucocratic granulite

Intermediate to Felsic Granulites Unsubdivided, grey to buff weathering, orthopyroxene-

bearing intermediate (granodiorite, tonalite to diorite)

orthogneiss

Intermediate to Felsic Granulites (layered) Unsubdivided, buff to grey weathering, layered, feldspathic

granulite

Intermediate to Felsic Granulites (retrogressed) Unsubdivided, grey, foliated to gneissic, intermediate

(granodiorite, tonalite to diorite) orthogneiss containing

evidence of retrogression from a granulite facies precursor

(e.g., unit 39 or 40); pegmatite veins may be common

Mafic Rocks Unsubdivided, layered, predominantly mafic two-pyroxene

granulite or gneissic metagabbro

Metasedimentary Rocks 36a Layered paragneiss, garnet-rich granulite

36b Marble, calc-silicate tectonic breccia

36

37

38

39

40

41

42

43

44

45

46

49

51

50

52

53

54

56

57

5555

48

47

6

7

8

9

10

11

12

14

13

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

THRUST CONTACT WITH PARRY SOUND DOMAIN (BASAL), LOCATED WITHIN PARRY SOUND SHEAR ZONE

Parry Sound Domain (basal) (units 30 to 35) Armer Bay Gneiss Association (units 34 and 35) Mafic Rocks Para-amphibolite, layered mafic gneiss, paragneiss and

quartzite

Mafic and Metasedimentary Rocks Quartzite, minor associated paragneiss and para-amphibolite

Lighthouse Gneiss Association (units 31 to 33) Intermediate to Felsic Rocks with Metadiabase Dikes 33a Layered, migmatitic, grey tonalite, minor trondhjemite,

granodiorite orthogneiss

33b Quartzite, minor associated paragneiss

Mafic Rocks Amphibolite

Mafic and Metasedimentary Rocks Para-amphibolite and unsubdivided paragneiss; includes

pelitic and garnet-rich gneiss interlayered with

quartzofeldspathic gneiss and minor quartzite

Gneissic Rocks Structurally Below the Lighthouse Gneiss Association (unit 30) Metasedimentary Rocks Grey biotite-muscovite-garnet-kyanite gneiss and schist

TECTONIC CONTACT (SUSPECT) WITH THE SHAWANAGA DOMAIN, LOCATED WITHIN THE PARRY SOUND SHEAR ZONE

Upper Go Home Domain (units 25 to 29) Pine Island Gneiss Association (units 27 to 29) Intermediate to Felsic Rocks 29a Grey, heterogeneous, leucosome-rich (>25%),

migmatitic granodioritic gneiss

29b Grey, migmatitic tonalitic and granodioritic orthogneiss

Mafic Rocks Mafic orthogneiss, amphibolite

Metasedimentary Rocks Layered to podiform calc-silicate gneiss

Pere Brebeuf Gneiss Association (units 25 and 26) Felsic Rocks Pink, sugary leucocratic granite gneiss

Intermediate to Felsic Rocks Grey, migmatitic tonalitic and granodioritic orthogneiss

TECTONIC CONTACT WITH SUBJACENT LOWER GO HOME DOMAIN: ALLOCHTHON-PARAUTOCHTHON BOUNDARY

Shawanaga Domain (units 19 to 24) Sand Bay Gneiss Association (units 21 to 24) Intermediate to Felsic Rocks Grey, layered quartzofeldspathic gneiss containing

hornblende, biotite, epidote

Felsic Rocks Pink, migmatitic, sugary leucocratic gneiss and subordinate

grey, migmatitic leucogneiss

Intermediate Rocks 22a Grey tonalitic orthogneiss

22b Dark grey dioritic orthogneiss, possible hypabyssal

intrusion (circa 1450 Ma)

Metasedimentary Rocks 21a Medium to dark grey, biotite-rich quartz-plagioclase

paragneiss and schist ("Dillon schist") with quartzite

horizons

21b Pink to grey marble

21c Calc-silicate gneiss

21d Para-amphibolite

21e Quartzite

Ojibway Gneiss Association (units 19 and 20) Intermediate to Felsic Rocks Unsubdivided pink and grey leucocratic gneiss

Migmatitic Rocks 19a Grey metatextite with pink, hornblende-epidote-bearing

leucosome

19b Grey, migmatitic, tonalitic to granodioritic gneiss with

varied amounts of pink leucosome

19c Grey hornblende-epidote-biotite tonalitic orthogneiss

TECTONIC CONTACT WITH SUBJACENT BRITT DOMAIN (NADEAU ISLAND GNEISS ASSOCIATION): ALLOCHTHON-PARAUTOCHTHON BOUNDARY

PARAUTOCHTHON SOUTH OF PARRY SOUND DOMAIN

Lower Go Home Domain (units 15 to 18) Honey Harbour Gneiss Association (units 15 to 18) Felsic Rocks 18a Pink to grey leucocratic gneiss

18b Pink to grey, migmatitic leucogranite to granodiorite

Intermediate to Felsic Rocks 17a Unclassified granitoid orthogneiss

17b Monzonitic to granitic orthogneiss

Mafic Rocks Mafic orthogneiss

Metasedimentary Rocks 15a Unclassified paragneiss

15b Marble; may be associated with rusty graphitic schist

15c Calc-silicate gneiss

BASE OF LOWER GO HOME DOMAIN NOT OBSERVED

PARAUTOCHTHON NORTH OF PARRY SOUND DOMAIN

Britt Domain (units 1 to 14) Nadeau Island Gneiss Association (units 9 to 14) Migmatitic Rocks Grey, migmatitic, leucocratic hornblende-biotite orthogneiss

of granodioritic to monzodioritic composition

Migmatitic Rocks Grey, leucocratic, migmatitic hornblende-biotite-garnet

orthogneiss of tonalitic to granodioritic composition

Metasedimentary Rocks 12a Unclassified paragneiss

12b Orthopyroxene-bearing, calcareous paragneiss, mafic

gneiss and para-amphibolited

12c Mafic granulitesd

Metasedimentary Rocks Pink, layered, leucocratic paragneiss

Metasedimentary Rocks Rusty weathering, graphitic paragneiss

Metasedimentary Rocks Grey, migmatitic, leucocratic garnet-biotite paragneiss,

locally with sillimanite; pink leucosome, may contain garnet,

muscovite, magnetite

Bayfield Gneiss Association (units 6 to 8) Intermediate to Felsic Rocks Pink, sugary leucocratic gneiss

Intermediate to Felsic Intrusive Rocks 7a Unsubdivided grey and pink, variably layered, highly

strained orthogneiss, in places with recrystallized

potassium feldspar megacrysts

7b Grey, leucocratic, migmatitic hornblende-biotite-garnet

orthogneiss of tonalitic to granodioritic composition

Metasedimentary Rocks 6a Grey, leuco- to mesocratic garnet-biotite paragneiss,

commonly with sillimanite; locally graphitic and

rusty weathering

6b Calc-silicate and amphibolite gneiss associated with

garnet-biotite paragneiss of unit 6a

1

2

3

4

5

Key Harbour Gneiss Association (units 2 to 5) Intermediate to Mafic Migmatitic Rocks Multicomponent layered gneiss and migmatite, minor

amphibolite

Intermediate to Felsic Rocks 4a Unsubdivided pink and grey leucocratic gneiss

4b Pink, sugary leucocratic gneiss

4c Predominantly grey gneiss with pink granitic leucosome

Mafic Rocks 3a Mafic gneiss; minor metagabbro, anorthositic gneiss

3b Mafic monzodiorite gneiss

Metasedimentary Rocks Layered, pink to grey quartz-feldspar-biotite paragneiss,

locally with garnet-hornblende and garnet-kyanite and

sillimanite gneiss; minor quartzite, calc-silicate gneiss

Bustard Islands Gneiss Association (unit 1) Intermediate Migmatitic Rocks 1a Mostly medium-grained, moderately foliated to gneissic,

migmatitic, granodiorite to tonalite containing

metamorphosed mafic dikes (amphibolite). No

leucosome older than the dikes is observed

1b Unit 1a, with minor amounts of unsubdivided polycyclic

and metasedimentary gneiss

1c Straight and mylonitic gneiss derived from units 1a

and/or 1b

a This legend is a field legend that locally incorporates the results of

laboratory investigations, including petrography and geochemistry.b This is a legend common to Ontario Geological Survey Preliminary

Maps P.3548, P.3549, P.3550, P.3551 and P.3552. Thus, not all

map units in the legend may appear on the map face.c A �gneiss association� is an informal stratigraphic term, introduced by

Culshaw et al. (1988), that is primarily based on rock type, but which

also may contain information with respect to plutonic history,

metamorphism or intrusion of mafic dikes. If it were decided to

formally name a "gneiss association" as a lithodemic unit under the

1983 North American Stratigraphic Code, in most cases, they would

correspond to a suite or a complex.d These rocks locally preserve evidence for granulite facies

metamorphism at circa 1450 Ma. Adjacent rocks may have been

subjected to similar metamorphic conditions, but have been subsequently

wholly overprinted by Grenvillian upper amphibolite facies metamorphism.��6

��11��69��69��35

��60��11��400��48

��11��12��26

��118

��117��141��169��169

��12

��118

BAY

Bay

LAKE

GEORGIAN

NottawasagaHURON

46°46°

46°46°

45°45°

45°45°

79°79°80°80°81°81°

79°79°80°80°81°81°

KeyKey

HeadHead

BalaBala

ByngByng

HoneyHoney

NovarNovar

KioskKiosk

NobelNobel

LeithLeith

InletInlet

BrittBritt

AlbanAlban

Lion'sLion's

DwightDwight

DorsetDorset

ArdbegArdbeg

DillonDillon

ValleyValley

PurplePurple

Shallow

HarbourHarbour

Norland

MidlandMidland

OrilliaOrillia

HarbourHarbour

Red BayRed Bay

WiartonWiarton

Brechin

Rosseau

KearneyKearney

MacTierMacTier

WashagoWashago

WaubamikWaubamik

FossmillFossmill

PowassanPowassan

RestouleRestoule

CommandaCommanda

McKellarMcKellar

OrrvilleOrrville

PakesleyPakesley

PickerelPickerel

TobermoryTobermory

EdenhurstEdenhurst

BaysvilleBaysville

SundridgeSundridge

DunchurchDunchurch

Pointe auPointe au

BroadbentBroadbent

KillarneyKillarney

HuntsvilleHuntsville

SprucedaleSprucedale

MagnetawanMagnetawan

SansSouciSansSouciDyer's BayDyer's Bay

Parry SoundParry Sound

GravenhurstGravenhurst

BracebridgeBracebridge

Trout CreekTrout Creek

South RiverSouth RiverPort LoringPort Loring

Burk's FallsBurk's Falls

French RiverFrench River

Ahmic

Harbour

Ahmic

Harbour

Baril StationBaril Station

North

Magnetawan

North

Magnetawan

NoëlvilleNoëlville

Port SydneyPort Sydney

PenetanguishenePenetanguishene

P.3551P.3551

P.3552P.3552

P.3548P.3548

P.3549P.3549

P.3550P.3550