DIAGRAMMATIC CROSS SECTION OF THE BEDROCK ...Hay Cove Syncline DIAGRAMMATIC CROSS SECTION OF THE...
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MARY’S BAY ST.MARY’S BAY PLACENTIA BAY PLACENTIA BAY 65 F F F F F F F F F F F F F F F F F F F F ba ba ba ba ba Mn Mn q Cu, q Mn ba Mn ca 712000 712000 5222000 5200000 5200000 5210000 5210000 5200000 5200000 5200000 5190000 5190000 5190000 5184000 5183000 720000 720000 728000 727000 728000 273000 273000 271000 272000 280000 280000 280000 290000 290000 290000 290000 297000 297000 296000 296000 294000 54 12 19 53 41 13 46 45 49 47 00 47 05 47 05 46 55 46 55 46 50 46 50 47 00 54 00 54 00 53 55 53 55 53 50 53 50 53 45 53 45 54 05 54 05 54 10 54 10 47 06 18 53 39 56 47 07 10 46 46 40 54 13 23 2L 12I 12B 12B 2D 1N 1N 60° 52° 51° 50° 49° 48° 47° 51° 50° 49° 48° 47° 58° 56° 54° 58° 56° 54° 12H 12A 1M 1M 2E 2E 2M 2C 2C 1K 11P 11O 2F St. Anthony Port aux Basques Deer Lake Stephenville Stephenville Grand Falls Gander St. John's J 12G Labrador 1L 11I NEWFOUNDLAND 0 150 km 50 100 INDEX MAP 12P 12P Corner Brook Corner Brook Digital NTS base maps ( 1M/1) used for this map are available The 2004 Magnetic North bearing is 18 36 West of Grid North; Grid North is 2 01 West of True North for centre of map. Elevations are in feet above sea level. Contour interval is 50 feet. Universal Transverse Mercator (UTM) Grid Zones 21 and 22. North American Datum 1927. Copies of this map may be obtained from the Geoscience Publications Section, Geological Survey, Department of Natural Resources, Government of Newfoundland and Labrador, P. O. Box 8700, St. John’s, NL, Canada, A1B 4J6. http:/www.geosurv.gov.nf.ca http:/www.nr.gov.nl.ca/mines&en/geosurvey The views and contents of this report are the sole responsibility of the author, and are published as a matter of public record. They do not necessarily reflect the official policies or views of the Department of Natural Resources, Government of Newfoundland and Labrador. 1K/13,1L/16, 1N/4, and from Surveys and Mapping Branch, Natural Resources, Ottawa, Canada. and Information Recommended Citation: Fletcher, T.P. 2006: Bedrock geology of the Cape St. Mary’s Peninsula, southwest Avalon Peninsula, Newfoundland (includes parts of NTS map sheets 1M/1, 1N/4, 1L/16 and 1K/13). Government of Newfoundland and Labrador, Department of Natural Resources, Geological Survey, Map 2006-02, Open File NFLD/2925. Author’s Address: Fletcher Bowmont Cottage East Links Road Dunbar, East Lothian Scotland EH42 1LT Dr. Terence Patrick 0 1 2 3 4 5 kilometres Scale 1:50 000 BEDROCK GEOLOGY OF THE CAPE ST. MARY’S PENINSULA, SOUTHWEST AVALON PENINSULA, NEWFOUNDLAND (includes parts of NTS map sheets 1M/1, 1N/4, 1L/16 and 1K/13) SYMBOLS Geological contact (defined, approximate, assumed) ......................... Thrust fault (teeth on overthrown slice) ............................................... Fault (defined, approximate; ticks on downthrown side) ..................... Anticline (defined, approximate; arrow indicates plunge) .................... Syncline (defined, approximate ) .................... Bedding, tops known (inclined - dips where measured in degrees) .... Cleavage (inclined, dip unknown) ....................................................... Jointing ................................................................................................ Layering (in sills) ................................................................................. Mineral occurrence (manganese, copper, quartz, barite, calcite) ................................................................................................. Fossil location ...................................................................................... Inferred paleocurrent direction based on ripple markings ................... Fault (inclined, includes mineral vein) ................................................. Fault, defined or approximate (relative movement) ............................. ; arrow indicates plunge Bedding, general structural trend (from aerial photographs, dip amount unknown) .......................................................................... F Head Cove Member: Dominantly dull red, blocky mudstone with sparse, discontinuous green and purple mudstone interbeds Undivided: Interbedded white-weathering quartz arenite with greenish-grey siltstone and sandstone; main quartz arenites form three members separated by two members of siltstone and sandstone that locally may be dark red siltstone and shaly mudstone or bright green mudstone with unfossiliferous septarian nodules; at base, thin, cobble-pebbly conglomerate with rhyolite, basalt, jasper and black chert clasts White-weathering, greenish-grey, arkose, sandstone, siltstone and mudstone in thick and thin beds, commonly as channel-fills and swaly interbeds Andesite lava, breccia and tuff with minor rhyolite flows intercalated grey and green arkose and siltstone at the top with Postdate Siluro-Devonian Folding Predate Siluro-Devonian Folding Dykes: Diorite to diabase, some with gabbroic texture and large euhedral plagioclase phenocrysts; generally following joints, as single dykes or as dyke swarms 15 14 13 12 11 11v 10 10e 10ev 10d 10c 10b 10a 9 9c 9b 9a 8 7 6 5b 5a 4c 4b 4a 3c 3b 3a 2 1 SILURIAN LATE CAMBRIAN MIDDLE AND LATE CAMBRIAN MIDDLE CAMBRIAN EARLY AND MIDDLE CAMBRIAN MIDDLE CAMBRIAN EARLY CAMBRIAN EDIACARAN HARCOURT GROUP (Units 11-13) Sills: Diorite to diabase-gabbro, as much as 70 m thick with some mineral and gravity layering TRIASSIC? LEGEND INTRUSIVE ROCKS SEDIMENTARY AND EXTRUSIVE ROCKS Dark grey to black, pyritic, shaly, silty mudstone with a middle division containing thin siltstone and sandstone interbeds Grey-green siltstone containing thin, blackish, shale layers and distinctive, brown- weathering, carbonate lenses with cone-in-cone structures in lower levels Black to dark grey, pyritic, shaly, silty mudstone with middle division of grey-green and black laminated siltstone; highly fossiliferous concretionary limestones and barren septarian nodules in lower half and thin, fossiliferous, limestone lenses in upper half; basal Metabentonite Bed ADEYTON GROUP (Units 6-10) Undivided: Red, grey-green and olive, blocky mudstone and marl containing rare carbonate nodules and thin limestone layers; basal part has manganiferous nodules and the upper part contains localized volcanic beds GULL COVE FORMATION BECKFORD HEAD FORMATION MIDDLE CAMBRIAN MANUELS RIVER FORMATION BRIGUS FORMATION CHAMBERLAIN’S BROOK FORMATION Cape Shore Member: St. Mary’s Limestone Grey-green, blocky mudstone, darker toward top with prominent in upper half Big Gully Member: Bright olive, blocky marl with fossiliferous carbonate lenses Waterfall Cove Member: Dominantly dark red mudstone with distinctive interbeds of bright red, purple and green mudstone and unfossiliferous, disc-shaped, carbonate concretions Wester Cove Member: Easter Cove Member: Blister Bed Upper part, bright red and dull red mudstone interbeds; lower part, highly fossiliferous, olive blocky mudstone. Upper part, highly fossiliferous, grey-green mudstone with distinctive manganiferous at top; lower part, fossiliferous, dull red mudstone with scattered small manganese nodules and thin, pale green interbeds containing tiny carbonate debris Undivided: Bright red mudstone with interbeds of green and purple mudstone and fossiliferous nodular limestone Branch Cove Member: Dull red mudstone with prominent purple-rimmed, pale green mudstone layers containing tiny fossiliferous carbonate debris Jigging Member: Bright red blocky mudstone with green-rimmed bedding planes in upper part and discontinuous, thin, purple and green laminae in lower part Redland Cove Member: Red, well-bedded mudstone with discontinuous green and purple mudstone layers and numerous nodular limestones Undivided: Pale pinkish-red, nodular and planar-bedded fossiliferous, stromatolitic limestones, with thin interbeds of dark red manganiferous mudstone; upper and lower Broad Cove Member Fosters Point Member SMITH POINT FORMATION Undivided: Dominantly red mudstone with interbeds of purple and green mudstone and nodular limestone and a basal gritty conglomeratic manganiferous limestone; upper with distinctive mudstone-nodular limestone rhythms; middle with distinctive stromatolitic at top; lower with distinctive at top Cuslett Member West Centre Cove Member St. Bride’s Limestone Petley Member Deadman’s Limestone MUSGRAVETOWN GROUP (Units 1-5) CROWN HILL FORMATION RANDOM FORMATION Cross Point Member: Dark red, current-bedded, gritty conglomerate Hurricane Brook Member: Dark red arkose, siltstone and bright red slaty mudstone with some green beds in lower part HEART'S CONTENT FORMATION Cats Cove Member: Dominantly wavy and wispy-bedded, greenish-grey siltstone with minor arkose, brownish, slaty mudstone and pebbly conglomerate Bellevue Beach Member: Pale greenish-grey, well-cemented, current-bedded, quartz- pebble conglomerate with thin siltstone beds; well-jointed blocks highly resistant to erosion Golden Bay Member: Greenish-grey and brown arkose and siltstone interbedded with brown and black slaty mudstone MATURIN PONDS FORMATION Lears Cove Member: Interbedded dark red arkose and siltstone with some gritty sandstone layers Young’s Port Member: Distinctive pale red, well-cemented, quartzose, polymictic conglomerate with diagnostic felsite pebbles, well-jointed blocks highly resistant to erosion; barite veins along joints False Cape Member: Dark red, current-bedded and rippled interbedded siltstone, arkose, slaty mudstone and gritty sandstone BIG HEAD FORMATION BULL ARM FORMATION Waterlain beds of highly calcareous, basaltic, lapilli tuff, ejecta and localized, thin, andesitic pillow lavas Hay Cove Basaltic Flow: Cape Dog Basaltic Flow: Spilitic, basaltic, pillow lava containing chert BONAVISTA FORMATION Geological survey by Terence P. Fletcher (University of Cambridge) at 1:50 000 scale in 1968; and minor amendments up to 2004. Mn, Cu, q, ba, ca Note: Disclaimer: Open File reports and maps issued by the Geological Survey Division of the Newfoundland and Labrador Department of Natural Resources are made available for public use without being formally edited or peer reviewed. They are based upon preliminary data and evaluation. The purchaser agrees not to provide a digital reproduction or copy of this product to a third party. Derivative products should acknowledge the source of the data. The Geological Survey, a division of the Department of Natural Resources (the “authors and publishers”), retains the sole right to the original data and information found in any product produced. The authors and publishers assume no legal liability or responsibility for any alterations, changes or misrepresentations made by third parties with respect to these products or the original data. Furthermore, the Geological Survey assumes no liability with respect to digital reproductions or copies of original products or for derivative products made by third parties. Please consult with the Geological Survey in order to ensure originality and correctness of data and/or products. Department of Natural Resources Geological Survey DEEP COVE FAULT ANTICLINE ANTICLINE BRANCH BRANCH MAGGOTTY COVE SYNCLINE MAGGOTTY COVE SYNCLINE EAST HEAD ANTICLINE EAST HEAD ANTICLINE LITTLE HARBOUR FAULT LITTLE HARBOUR FAULT CAPE DOG SYNCLINE CAPE DOG SYNCLINE BEAR HEAD SYNCLINE BEAR HEAD SYNCLINE BECKFORD ANTICLINE BECKFORD ANTICLINE SYNCLINE COVE COVE HAY HAY GULL COVE SYNCLINE GULL COVE SYNCLINE HURRICANE BROOK FAULT HURRICANE BROOK FAULT PERCH COVE FAULT PERCH COVE FAULT ANGEL’S ANGEL’S COVE COVE FAULT FAULT CAPE CAPE ST. MARY’S MARY’S ANTICLINE ANTICLINE ST. BRIDE’S SYNCLINE ST. BRIDE’S SYNCLINE ST. BRIDE’S SYNCLINE ST. BRIDE’S SYNCLINE BIG HEAD COVE ANTICLINE BIG HEAD COVE ANTICLINE POINT POINT LANCE LANCE SYNCLINE SYNCLINE A B 5b 6 6 5a 6 6 6 6 8 8 8 8 8 6 7 7 8 8 8 13 12 13 12 14 14 12 12 11v 11v 13 13 11 11 11 11 14 14 9 13 13 10 10 10 10 10 9 9 9 9 7 7 10 2 2 2 2 2 3 3 3 3 3 3 2 2 2 3 3 3 4 4 4 4 4 4 14 14 4 4 4 5a 5a 5a 9 Cross Point- Perch Cove cliff Highway 100 Axis of St. Bride’s Syncline Perch Cove Fault Bull Arm Formation ? Highway 100 Axis of Cape St. Mary’s Anticline Axis of Point Lance Synclinorium Highway 100 minor axis of Big Head Cove anticline Axis of Gull Cove Syncline Gull Cove Thrust Axis of Branch Anticline Branch Head- Hay Cove Cliff Axis of Hay Cove Syncline DIAGRAMMATIC CROSS SECTION OF THE BEDROCK GEOLOGY BETWEEN THE CROSS POINT-PERCH COVE CLIFF AND THE BRANCH HEAD-HAY COVE CLIFF metres 152.5 -305 -610 sea level A B F F MAP 2006-02 Open File NFLD/2925
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NEWFOUNDLAND
0 150
km
50 100
INDEX MAP
12P12P
CornerBrook
CornerBrook
Digital NTS base maps ( 1M/1) used for thismap are available
The 2004 Magnetic North bearing is 18 36 West of Grid North; GridNorth is 2 01 West of True North for centre of map.
Elevations are in feet above sea level. Contour interval is 50 feet.
Universal Transverse Mercator (UTM) Grid Zones 21 and 22.
North American Datum 1927.
Copies of this map may be obtained from the Geoscience PublicationsSection, Geological Survey, Department of Natural
Resources, Government of Newfoundland and Labrador, P. O. Box8700, St. John’s, NL, Canada, A1B 4J6.http:/www.geosurv.gov.nf.cahttp:/www.nr.gov.nl.ca/mines&en/geosurvey
� �
� �
The views and contents of this report are the sole responsibility of theauthor, and are published as a matter of public record. They do notnecessarily reflect the official policies or views of the Department ofNatural Resources, Government of Newfoundland and Labrador.
1K/13,1L/16, 1N/4, andfrom Surveys and Mapping Branch, Natural
Resources, Ottawa, Canada.
and Information
Recommended Citation:Fletcher, T.P.2006: Bedrock geology of the Cape St. Mary’s Peninsula, southwestAvalon Peninsula, Newfoundland (includes parts of NTS map sheets1M/1, 1N/4, 1L/16 and 1K/13). Government of Newfoundland andLabrador, Department of Natural Resources, Geological Survey, Map2006-02, Open File NFLD/2925.
Author’s Address:Fletcher
Bowmont CottageEast Links RoadDunbar,East LothianScotlandEH42 1LT
Dr. Terence Patrick
0 1 2 3 4 5
kilometres
Scale 1:50 000
BEDROCK GEOLOGY OF THE CAPE ST. MARY’S PENINSULA,SOUTHWEST AVALON PENINSULA, NEWFOUNDLAND
(includes parts of NTS map sheets 1M/1, 1N/4, 1L/16 and 1K/13)
SYMBOLS
Geological contact (defined, approximate, assumed) .........................
Thrust fault (teeth on overthrown slice) ...............................................
Fault (defined, approximate; ticks on downthrown side) .....................
Anticline (defined, approximate; arrow indicates plunge) ....................
Syncline (defined, approximate ) ....................
Bedding, tops known (inclined - dips where measured in degrees) ....
Cleavage (inclined, dip unknown) .......................................................
Jointing ................................................................................................
Layering (in sills) .................................................................................
Mineral occurrence (manganese, copper, quartz, barite,
calcite) .................................................................................................
Fossil location ......................................................................................
Inferred paleocurrent direction based on ripple markings ...................
Fault (inclined, includes mineral vein) .................................................
Fault, defined or approximate (relative movement) .............................
; arrow indicates plunge
Bedding, general structural trend (from aerial photographs,
dip amount unknown) ..........................................................................
F
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Head Cove Member: Dominantly dull red, blocky mudstone with sparse, discontinuousgreen and purple mudstone interbeds
Undivided: Interbedded white-weathering quartz arenite with greenish-grey siltstone andsandstone; main quartz arenites form three members separated by two members ofsiltstone and sandstone that locally may be dark red siltstone and shaly mudstone orbright green mudstone with unfossiliferous septarian nodules; at base, thin, cobble-pebblyconglomerate with rhyolite, basalt, jasper and black chert clasts
White-weathering, greenish-grey, arkose, sandstone, siltstone and mudstone in thick andthin beds, commonly as channel-fills and swaly interbeds
Andesite lava, breccia and tuff with minor rhyolite flows intercalated grey and greenarkose and siltstone at the top
with
Postdate Siluro-Devonian Folding
Predate Siluro-Devonian Folding
Dykes: Diorite to diabase, some with gabbroic texture and large euhedral plagioclasephenocrysts; generally following joints, as single dykes or as dyke swarms
15
14
13
12
11
11v
10
10e
10ev
10d
10c
10b
10a
9
9c
9b
9a
8
7
6
5b
5a
4c
4b
4a
3c
3b
3a
2
1
SILURIAN
LATE CAMBRIAN
MIDDLE AND LATE CAMBRIAN
MIDDLE CAMBRIAN
EARLY AND MIDDLE CAMBRIAN
MIDDLE CAMBRIAN
EARLY CAMBRIAN
EDIACARAN
HARCOURT GROUP (Units 11-13)
Sills: Diorite to diabase-gabbro, as much as 70 m thick with some mineral and gravitylayering
TRIASSIC?
LEGEND
INTRUSIVE ROCKS
SEDIMENTARY AND EXTRUSIVE ROCKS
Dark grey to black, pyritic, shaly, silty mudstone with a middle division containing thinsiltstone and sandstone interbeds
Grey-green siltstone containing thin, blackish, shale layers and distinctive, brown-weathering, carbonate lenses with cone-in-cone structures in lower levels
Black to dark grey, pyritic, shaly, silty mudstone with middle division of grey-green andblack laminated siltstone; highly fossiliferous concretionary limestones and barrenseptarian nodules in lower half and thin, fossiliferous, limestone lenses in upper half;basal Metabentonite Bed
ADEYTON GROUP (Units 6-10)
Undivided: Red, grey-green and olive, blocky mudstone and marl containing rarecarbonate nodules and thin limestone layers; basal part has manganiferous nodulesand the upper part contains localized volcanic beds
GULL COVE FORMATION
BECKFORD HEAD FORMATION
MIDDLE CAMBRIAN
MANUELS RIVER FORMATION
BRIGUS FORMATION
CHAMBERLAIN’S BROOK FORMATION
Cape Shore Member:St. Mary’s Limestone
Grey-green, blocky mudstone, darker toward top with prominentin upper half
Big Gully Member: Bright olive, blocky marl with fossiliferous carbonate lenses
Waterfall Cove Member: Dominantly dark red mudstone with distinctive interbeds ofbright red, purple and green mudstone and unfossiliferous, disc-shaped, carbonateconcretions
Wester Cove Member:Easter Cove Member:
Blister Bed
Upper part, bright red and dull red mudstone interbeds; lowerpart, highly fossiliferous, olive blocky mudstone. Upper part,highly fossiliferous, grey-green mudstone with distinctive manganiferousat top; lower part, fossiliferous, dull red mudstone with scattered small manganesenodules and thin, pale green interbeds containing tiny carbonate debris
Undivided: Bright red mudstone with interbeds of green and purple mudstone andfossiliferous nodular limestone
Branch Cove Member: Dull red mudstone with prominent purple-rimmed, pale greenmudstone layers containing tiny fossiliferous carbonate debris
Jigging Member: Bright red blocky mudstone with green-rimmed bedding planes inupper part and discontinuous, thin, purple and green laminae in lower part
Redland Cove Member: Red, well-bedded mudstone with discontinuous green andpurple mudstone layers and numerous nodular limestones
Undivided: Pale pinkish-red, nodular and planar-bedded fossiliferous, stromatoliticlimestones, with thin interbeds of dark red manganiferous mudstone; upper
and lowerBroad
Cove Member Fosters Point Member
SMITH POINT FORMATION
Undivided: Dominantly red mudstone with interbeds of purple and green mudstone andnodular limestone and a basal gritty conglomeratic manganiferous limestone; upper
with distinctive mudstone-nodular limestone rhythms; middlewith distinctive stromatolitic at top; lower
with distinctive at top
Cuslett Member WestCentre Cove Member St. Bride’s LimestonePetley Member Deadman’s Limestone
MUSGRAVETOWN GROUP (Units 1-5)
CROWN HILL FORMATION
RANDOM FORMATION
Cross Point Member: Dark red, current-bedded, gritty conglomerate
Hurricane Brook Member: Dark red arkose, siltstone and bright red slaty mudstonewith some green beds in lower part
HEART'S CONTENT FORMATION
Cats Cove Member: Dominantly wavy and wispy-bedded, greenish-grey siltstone withminor arkose, brownish, slaty mudstone and pebbly conglomerate
Bellevue Beach Member: Pale greenish-grey, well-cemented, current-bedded, quartz-pebble conglomerate with thin siltstone beds; well-jointed blocks highly resistant toerosion
Golden Bay Member: Greenish-grey and brown arkose and siltstone interbedded withbrown and black slaty mudstone
MATURIN PONDS FORMATION
Lears Cove Member: Interbedded dark red arkose and siltstone with some gritty sandstonelayers
Young’s Port Member: Distinctive pale red, well-cemented, quartzose, polymicticconglomerate with diagnostic felsite pebbles, well-jointed blocks highly resistant toerosion; barite veins along joints
False Cape Member: Dark red, current-bedded and rippled interbedded siltstone,arkose, slaty mudstone and gritty sandstone
BIG HEAD FORMATION
BULL ARM FORMATION
Waterlain beds of highly calcareous, basaltic, lapilli tuff,ejecta and localized, thin, andesitic pillow lavasHay Cove Basaltic Flow:
Cape Dog Basaltic Flow: Spilitic, basaltic, pillow lava containing chert
BONAVISTA FORMATION
Geological survey by Terence P. Fletcher (University of Cambridge) at1:50 000 scale in 1968; and minor amendments up to 2004.
Mn, Cu, q, ba, ca
Note:
Disclaimer:
Open File reports and maps issued by the Geological Survey Divisionof the Newfoundland and Labrador Department of Natural Resourcesare made available for public use without being formally edited or peerreviewed. They are based upon preliminary data and evaluation.
The purchaser agrees not to provide a digital reproduction or copy ofthis product to a third party. Derivative products should acknowledgethe source of the data.
The Geological Survey, a division of the Department of NaturalResources (the “authors and publishers”), retains the sole right to theoriginal data and information found in any product produced. Theauthors and publishers assume no legal liability or responsibility forany alterations, changes or misrepresentations made by third partieswith respect to these products or the original data. Furthermore, theGeological Survey assumes no liability with respect to digitalreproductions or copies of original products or for derivative productsmade by third parties. Please consult with the Geological Survey inorder to ensure originality and correctness of data and/or products.
Department ofNatural Resources
Geological Survey
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10
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3
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23
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4
4
4
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4
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14
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4
4
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5a
5a
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9
Cross Point-Perch Cove cliff
Highway 100
Axis ofSt. Bride’s Syncline
Perch CoveFault
Bull Arm Formation ?
Highway 100
Axis ofCape St. Mary’s Anticline
Axis ofPoint Lance Synclinorium
Highway 100
minor axis ofBig Head Cove anticline
Axis ofGull CoveSyncline
Gull CoveThrust
Axis ofBranch
Anticline
Branch Head-Hay Cove
Cliff
Axis ofHay Cove Syncline
DIAGRAMMATIC CROSS SECTION OF THE BEDROCK GEOLOGY BETWEEN THE CROSS POINT-PERCH COVE CLIFF AND THE BRANCH HEAD-HAY COVE CLIFF
metres
152.5
-305
-610
sea level
A BF F
MAP 2006-02
Open File NFLD/2925
