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Robert’s
Arm
B A D G E R
B A Y
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Y
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AL
W i l d
B i g h t
S o p sA r m
N O R T H
T W I N L A K E
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r e s c e n tL a k e
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Side
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bour
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nys
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l
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Brook
Tommys
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360
5470000m. N.5470000m. N.
5470000m. N.5470000m. N.
5460000m. N5460000m. N
5480000m. N.5480000m. N.
5480000m. N5480000m. N
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.5483000m. N.5483000m. N.
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2 1
LATE ORDOVICIAN
MIDDLE AND LATE ORDOVICIAN
MIDDLE ORDOVICIAN (?)
BADGER GROUP (Unit 27)Gull Island Formation
Shoal Arm Formation
SOPS HEAD COMPLEX
Sparry Limestone:
Basalt Flows:
Mottled Turbidite and Variegated Chert:
Polymictic Conglomerate
Black Argillite - Pebbly Mudstone:
Massive Wacke:
Early Late Ordovician:
Late Middle Ordovician to Early Late Ordovician (?):
TECTONIZED BLOCK-IN-MATRIX MELANGE UNITMiddle Ordovician to Late Silurian (?):
Middle Ordovician:
Early to Middle Ordovician (?):
Early to Middle Ordovician (?):
Early to Middle Ordovician (?):
Early to Middle Ordovician (?):
Early to Middle Ordovician (?):
predominantly thin- and thick-bedded, light-grey sandstone turbidites; minordark-grey siltstone interbeds (near base of unit); rare beds of cobble conglomerate(with fossiliferouslimestone clasts) and pebbly wacke (along part of western flank of Badger Group synclinorium)
red radiolarian chert, red laminated argilliteand red siliceous siltstone with slump-folded nodules; red and green siltstone rhythmites (containingpyrolusite-bearing horizons) interbedded with turquoise chert; light-grey, thin-bedded to laminated,silicified wacke interbedded with green siliceous argillite; light-green, coticule-bearing, argillaceouslaminites and irregularly mottled manganiferous sandstone; light-grey bioturbated chert with rare blackshale partings; black graptolitic slate interstratified with very thin beds of pyritic carbonaceous siltstoneand dark-grey siliceous argillite
dark-grey melange dominated by small polylithic blockswith internal foliations or internal folds; platey, pyrite-rich, black phyllite or pelitic schist (locally formingthe matrix of the melange belt or representing an original mudstone-bearing map unit); minorporphyroclastic schist derived from semi-psammite and metabasite; minor red-matrix melange derivedfrom hematitic basalt and protomylonite; minor green-matrix melange derived from chloritic basalt andcataclastite
conodont-bearing limestone in stratigraphic contact with
various basalt types in discrete volcanic blocks; limestone beds forming solitary carbonate megablocksand smaller olistoliths in melange; limestone clasts resedimented along with monolithic basalt clasts inalternating muddy and calcareous debrites; banded marble interstratified or tectonically interlayered withpyritic black argillite. Similar lithodemes within large limestone clasts in Unit 8. Also in the basal MooresCove Formation of the Cottrells Cove Group, the Hummock Island Limestone of the Exploits Group, andthe Cutwell Group on Long Island.
internally fractured, marginally shattered
epidotized basalt (injected by green epiclastic wacke - itself impregnated with black mudstone);massive, light-green, fine-grained, silicified basalt (in depositional contact with siliciclastic andcalcareous sedimentary strata within map-scale blocks); pillow breccia and hematized basalt(resedimented with jasper and chert in red siliceous debrite); minor olistoliths of basalt breccia (chilledagainst mudstone) in a matrix of fractured volcaniclastic wacke; the above rock types are seen in thedominantly sand-matrix debrite belts. The dominantly mud-matrix debrite belts display light-green anddark-grey aphanitic basalt (injected by black mudstone) and porphyritic vesicular basalt (augened byfeatureless black mudstone, or wrapped by partially broken interbeds of pyritic black argillite and dark-grey laminated siltstone, or partly enclosed by black pebbly mudstone). Similar lithodemes in Unit 17.Also in the Pennys Brook Formation of the Wild Bight Group and the Crescent Lake Formation of theRoberts Arm Group.
green and grey,
parallel- and crosslaminated, rhythmically interbedded, siliceous turbidites with mottled and nodulartexture (forming mottled olistoliths within unmottled pebbly mudstone). Minor red, green and grey chertinterbedded with laminated siliceous argillite. Similar lithodemes in Unit 15 and Unit 18.
thickly stratified, poorly sorted,
graded conglomerate beds with distinctive basalt, limestone and granite boulders (partly or completelyenclosed by chaotically deformed sandy debrite); small, massive, buff-weathered conglomerate blocks(within muddy debrites); conglomeratic turbidite lenticles (preserving erosive bases above black pyriticargillite and channels within interstratified sandstone turbidites). Similar unbroken lithodemes in Unit 8.
sulphidic pebbly mudstone
(showing in-situ fragmentation of slumped grey siltstone and black argillite beds); basalt block-in-argillitewithin conglomerate block-in-argillite within pebbly mudstone or sandy debrite; stratiform intervals ofcoherently-bedded black argillite (forming a substrate, devoid of chert, to basalt or conglomeratesequences). Similar unbroken lithodemes in Unit 7.
buff-weathered, massive, granular wacke
completely or partially surrounding polylithic blocks in debrites; minor, partially disaggregated interbedsof light-grey wacke and dark-grey argillite. Unbroken successions of similar wacke (interstratified withthin-bedded sandstone and siltstone) may occur in Unit 6.
:
BROKEN OLISTOSTROMAL UNITS
27
25
26
24
23
22
21
20
19
interbedded red and green chert; deep-red and bright-red, thin-bedded,laminated argillite; green and grey, medium-bedded, fine-grained, siliceous, sandstone turbidite. Inplaces, Unit 18 is interlayered with Unit 17 or stratigraphically overlies Unit 17. Similar lithodemes occurin the lower Crescent Lake Formation of the Roberts Arm Group, the lower Moores Cove Formation ofthe Cottrells Cove Group, the lower Strong Island Chert of the Exploits Group, and the lower Shoal ArmFormation (as well as in Late Cambrian(?) to Middle Ordovician units such as the Omega PointFormation of the Wild Bight Group and the Saunders Cove Formation of the Exploits Group).
light-green, variably porphyritic, basalt flows; massive, poorly stratified and well-graded basalt breccias ; minor flow-foliated vesicular basalt; rare pillow breccia with epiclastic orcalcareous cement; rare, grey aphanitic, mafic to intermediate, volcanic flows
thinly bedded, grey, banded, microcrystalline chert interstratified with sulphidicand siliceous, black argillite; minor, buff-weathered, light-grey, netveined and recrystallized chert; theserocks are interlayered with Unit 15 or stratigraphically overlie Unit 15
mottled, green and grey, parallel- and crosslaminated, siliceous turbidites;nodular, fine-grained, thin-bedded, graded sandstone with mud microflakes and sandstone dykelets;rhythmic interbeds of dark-green cherty siltstone and dark-grey banded argillite. Unit 15 underlies andbut also overlies Unit 17 and is in depositional contact with Unit 7 and Unit 8; similar lithodemes arepresent in the upper Pennys Brook Formation of the Wild Bight Group, the lower Shoal Arm Formation,and the upper New Bay Formation of the Exploits Group
interbedded bright-red and dark-red chert; maroon, thin-bedded siltstoneand siliceous laminated argillite; light-green, medium-bedded, siliceous sandstone; grey-green, medium-to thick-bedded wacke with distinctive jasper, granite and basalt pebbles
light-green, massive, aphanitic, vesicular basalt; dark-green, fine-grained,pyroxene-porphyritic basalt; minor, green and red, variably hematized, pillowed basalt with red chertveins (possible thrust slice of Unit 11); rare interstitial red chert and interflow red argillite
gabbro sills; unseparated diorite sheets
pillow lava and pillow breccia; dark-green, massive, vesicular, variablyporphyritic, locally flow-foliated basalt; pillowed basalts with epidote-rich and hematite-rich zones inconcentric bands and as veinlets; variably hematized basalt with minor interstitial and interflow red chert
light-grey, massive, quartz-phyric felsite; buff to pink, felsic crystal tuff witheutaxitic quartz grains; variably chloritized, felsic lithic tuff (locally containing silicified rock fragments);felsic breccia with subordinate basalt blocks; minor quartz-feldspar porphyry
UNBROKEN LITHOSTRATIGRAPHIC UNITS
Middle Ordovician (?):
Middle Ordovician (?):
Middle Ordovician (?):
Middle Ordovician (?):
Early Middle Ordovician (?):
Late Early Ordovician (?):
Early or Middle Ordovician (?):
Late Early Ordovician (?):
Late Early Ordovician(?):
[Wild Bight Group / Exploits Group / Roberts Arm Group / Cottrells Cove Group]
EARLY TO MIDDLE ORDOVICIANROBERTS ARM GROUP
Crescent Lake Formation
Unseparated terranes/formations
18
17
16
15
14
13
12
11
10
LATE CAMBRIAN (?) TO MIDDLE ORDOVICIAN
medium-grained equigranular gabbro sills; minor dark-grey diorite sheets;glomeracrystic gabbro and diabase (in places cutting epidotized and saussuritized gabbro)
polymictic, cobble-to-boulder, clast-supported conglomerate with well-roundedsiliciclastic, calcareous and magmatic clasts; massive, light-grey pebbly wacke; depositional contactswith Unit 6 and Unit 7. Similar lithodemes are also presently assigned to the upper Moores CoveFormation of the Cottrells Cove Group and the upper Crescent Lake Formation of the Roberts Arm Group
dark-grey and black, laminated and siliceous, siltstone turbidites; black,pyritic argillite or pyritic slate; minor, light-green, slump-folded sandstone with interbedded or chaoticallymixed mudstone
thin interbeds of light green sandstone and dark grey siltstone; minor, lightgrey, medium-bedded granular wacke; rare, dark-grey and black sulphidic argillite; all the rocks aresiliceous and highly indurated
thin-bedded, green and grey, variably mottled, concretionaryturbidites; thin- and thick-bedded, grey-green sandstone with imbricated rip-up clasts of slump-foldedbanded argillite grading to parallel-laminated sandstone; thickly-stratified, dark-green, tuffaceous wackewith predominant vesicular basalt and subordinate intermediate to felsic volcanic clasts; massive tothickly bedded epiclastic wacke with mixed sedimentary and volcanic clasts; minor pebbly wacke withdistinctive jasper and red argillite clasts. 5a; laterally discontinuous lenticles of pillow lava, pillowbreccia and massive vesicular basalt breccia; associated sand-matrix olistostromes and choaticallyslumped mixtites with various volcanic and sedimentary intraclasts
dark-green, porphyritic pillow lava with some interstitial chert; minor, thin-bedded light-green, graded sandstone and light-grey, parallel-laminated argillite; rare gabbro sills; rarebeds of mafic and possibly felsic tuff
red, massive to thickly stratified, poorly sorted gravel beds with sub-rounded cobbles and boulders of hematized volcanic and intrusive rocks; chaotically slumped debriteand red conglomeratic wacke; red chert, red siliceous argillite and hematitic banded iron formation;interbedded, red and green, parallel- and crosslaminated siltstone turbidites; dark grey shale; light grey,thickly stratified, polymictic, conglomeratic turbidite
Variably hematized vesicular basalt; red and green, pillow lavaand pillow breccia; minor, mafic lithic tuff; rare, red, interpillow argillite; rare diorite sills
buff-weathered, flow-banded rhyolite breccia; massive, pyritizedand hematized rhyolite; dark-green pillow lava and basalt breccia; mixed mafic - felsic volcanic breccia;minor, chloritic lithic tuff; minor, light-green, quartz-phyric crystal tuff; rare, purplish-red rhyolite dykes;rare, light-grey, crosslaminated sandstone
ORDOVICIAN INTRUSIVE ROCKSGummy Brook Gabbro
EXPLOITS GROUPNew Bay Formation
WILD BIGHT GROUPPennys Brook Formation
Sparrow Cove Formation
Omega Point Formation
Side Harbour Formation
Seal Bay Brook Formation
Middle Ordovician (?):
Late Early Ordovician:
Late Early Ordovician (?):
Late Early Ordovician (?):
Early Middle to Late Middle Ordovician:
Early to Middle Ordovician (?):
Early to Middle Ordovician (?):
Late Cambrian (?) to Early Ordovician:
Late Cambrian (?) to Early Ordovician:
9
8
7
6
5
4
3
2
1
5a
MAP 2000-06OPEN FILE 002E/05/1073
GEOLOGY OF THE BADGER BAY REGION (NTS 2E/5),
WESTERN NOTRE DAME BAY
LEGEND
GOVERNMENT OFNEWFOUNDLANDAND LABRADOR
Department ofMines and Energy
Geological Survey
0 1 2 3 4 5
kilometres
Scale 1:50 000
2L12I
12B12B 2D
1N1N
60� 52�
51�
50�
49�
48�
47�
51�
50�
49�
48�
47�
7
58� 56� 54�
58� 56� 54�
12H
12A
1M1M
2E2E
2M
2C2C
1K
11P11O
2F
St.Anthony
Port auxBasques
DeerLake
StephenvilleStephenville
GrandFalls
Gander
St.John's
�
12G
Labrador
1L11I
NEWFOUNDLAND
0 150
km
50 100
INDEX MAP
12P12P
CornerBrook
CornerBrook
Exposure location ................................................................................
Strike and dip of bedding (tops known) ...............................................
Strike and dip of bedding (tops unknown) ...........................................
Strike and dip of bedding (overturned) ................................................
Stratigraphic boundary or intrusive contact (approximate) ..................
Pseudoporphyroblast-bearing alteration zone .....................................
Anticline [locally neutral or synformal] with plunge direction
indicated (upright, overturned) ............................................................
Syncline [locally neutral or antiformal]
with plunge direction indicated (upright, overturned) ...........................
Reverse faults [relative age unspecified] (barbs drawn on
original hangingwall sequence) ...........................................................
Strike-slip component of fault movement (sinistral, dextral) ................
Cross fault (post-thrusting and folding) ................................................
Note: Only selected bedding symbols shown on map; other measurements onminor structures are omitted. Bedding symbols are offset in position fromexposure location.
SYMBOLS
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