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NEWFOUNDLAND
0 150
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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
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10ev
10d
10c
10b
10a
9
9c
9b
9a
8
7
6
5b
5a
4c
4b
4a
3c
3b
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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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5a
5a
5a
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
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