QUATERNARY |
|
|
Q: QUATERNARY
unconsolidated glacial, glaciofluvial
and glaciolacustrine deposits; fluviatile silt, sand, and gravel, and local
volcanic ash, in part with cover of soil and organic deposits |
MIOCENE TO PLIOCENE AND(?) YOUNGER |
|
|
NW: WRANGELL LAVAS
mafic to felsic volcanic rocks (1) with
local conglomerate (2)
| 1. |
rusty red-brown,
phyric and non-phyric basaltic andesite flows (minor pillow lava), interbedded
with felsic tuff, volcanic sandstone and conglomerate; acid pyroclastics
related to intra-Wrangell intrusions; thin basaltic andesite and andesite
flows (Wrangell Lavas) |
| 2. |
volcanic conglomerate;
clasts all Wrangell derived (Wrangell Lavas) |
|
MID TO LATE MIOCENE |
|
|
MW: WRANGELL SUITE
fine to medium grained, hornblende +/-
biotite granodiorite and porphyritic (K-feldspar) hornblende granodiorite;
medium grained, uniform biotite diorite and pyroxene gabbro; subvolcanic
hornblende +/- biotite rhyolite, rhyodacite, dacite, and trachyte (Wrangell
Suite) |
OLIGOCENE |
|
|
OT: TKOPE SUITE
light pinkish-grey, medium- to coarse-grained,
homogeneous, biotite and/or hornblende granite (locally miarolitic); lesser
light creamy-grey biotite hornblende granodiorite, dark grey biotite hornblende
quartz diorite and gabbro-diorite (Tkope Suite) |
PALEOCENE TO OLIGOCENE |
|
|
OA: AMPHITHEATRE
yellow-buff to grey-buff sandstone, pebbly
sandstone, polymictic conglomerate, siltstone, mudstone; minor brown-grey
carbonaceous shale and thin lignitic coal; mostly fluvial and lacustrine
deposits, local debris-flow deposits; some shallow marine (Aphitheatre
; Kulthieth) |
EOCENE |
|
|
ES: SEWARD SUITE
non- to weakly foliated, light to mid-brownish-grey,
medium grained, biotite and hornblende-biotite tonalite and granodiorite;
rarer granite and quartz diorite (Seward Suite) |
LATE EARLY CRETACEOUS |
|
|
EKK: KLUANE RANGES SUITE
mid-grey, medium to coarse grained, biotite
hornblende granodiorite, quartz diorite, quartz monzonite, and hornblende
diorite (Kluane Ranges Plutonic Suite) |
LATE EARLY CRETACEOUS |
|
|
EKP: PYROXENITE CREEK ULTRAMAFIC
medium grained hornblende pyroxene gabbro,
and biotite hornblende diorite; olivine and hornblende clinopyroxenite
(Pyroxenite Creek Ultramafic) |
UPPER JURASSIC TO LOWER CRETACEOUS |
|
|
JKD: DEZADEASH
clastic succession (1) but locally including
undifferentiated younger strata (2)
| 1. |
interbedded light
to dark buff-grey lithic greywacke, sandstone, siltstone, thin dark grey
shale, argillite, phyllite and conglomerate; rare tuff (Dezadeash) |
| 2. |
sandstone, conglomerate,
shale, siliceous tuff: shallow-marine shelf deposits |
|
LATE JURASSIC TO EARLIEST CRETACEOUS |
|
|
JKS: SAINT ELIAS SUITE
nonporphyritic and porphyritic (K-feldspar),
biotite hornblende granodiorite; lesser nonporphyritic biotite and/or hornblende
tonalite; locally includes biotite hornblende quartz monzodiorite, quartz
diorite, granite, and quartz monzonite (Saint Elias Suite) |
CRETACEOUS AND (?) OLDER |
|
|
KY: YAKUTAT
greywacke and conglomerate in thick members
or interbedded with siltstone, argillite, or slate; melange with blocks
(to several km) of greenstone, limestone, marble, granitic rocks, chert,
and greywacke in a matrix of cherty and tuffaceous pelite (Yakutat Gp.) |
CRETACEOUS AND (?) OLDER |
|
|
KV: VALDEZ
dark grey argillite and greywacke: includes
granitoid dykes, sills, and locally plugs, green pillow lava, breccia,
and tuff; metamorphosed equivalents include brown schists, granitoid gneisses
and dark green amphibolite (Valdez Gp.) |
UPPER TRIASSIC |
|
|
uTrC: CHITISTONE
thin interbedded light to dark grey argillaceous
limestone and dark grey argillite; massive light grey limestone, limestone
breccia and darker grey, well-bedded limestone; white to creamy-white gypsum
and anhydrite (McCarthy, Chitistone and Nizina limestones) |
UPPER TRIASSIC |
|
|
uTrN: NICOLAI
amygdaloidal basaltic and andesitic flows,
with local tuff, breccia, shale and thin-bedded bioclastic limestone; volcanic
breccia, pillow lava and conglomerate at base; locally includes dark grey
phyllite and minor thin grey limestone of Middle Triassic (Nicolai Greenstone) |
PENNSYLVANIAN TO (?) LOWER PERMIAN |
|
|
CPS: SKOLAI
volcanics succeeded upward by clastic
strata (1) and including minor limestone (2)
| 1. |
tuff, breccia, argillite,
agglomerate, augite-phyric basaltic to andesitic flows (Station Cr. Fm);
succeeded by thin-bedded argillite, siltstone, minor greywacke and conglomerate
and local thin basaltic flows, breccia and tuff (Hasen Cr. Fm) (Skolai
Gp., Station Creek and Hasen Creek) |
| 2. |
buff bioclastic
limestone, calcarenite |
|
LATE TRIASSIC AND (?) OLDER |
|
|
PTrK: KLUANE ULTRAMAFIC
SUITE
mafic to ultramafic intrusions in 1) Wrangellia
terrane and 2) Alexander terrane
| 1. |
medium grey-green,
massive, medium grained, pyroxene gabbro and greenstone sills; sheeny black
peridotite, rare dunite (Kluane-type Mafic-Ultramafics; Squaw Datlasaka
Ranges Gabbro-Diabase Sills) |
| 2. |
medium grey-green,
massive, medium grained, pyroxene gabbro and greenstone sills; sheeny black
peridotite, rare dunite (Kluane-type Mafic-Ultramafics; Squaw Datlasaka
Ranges Gabbro-Diabase Sills) |
|
LATE PENNSYLVANIAN TO EARLY PERMIAN |
|
|
CPI: ICEFIELD RANGES SUITE
(270-290 MA)
mid- to dark greenish-grey, medium grained,
nonfoliated and foliated, biotite hornblende quartz monzodiorite-quartz
diorite-diorite, veined and intruded by leucocratic granodiorite and quartz
syenite (agmatite); pink hornblende syenite (Icefield Ranges Suite) |
PALEOZOIC, (?) DEVONIAN AND/OR YOUNGER |
|
|
PSC: STEEL CREEK
massive medium- to coarse-grained, rusty
grey-green hornblende pyroxene gabbro, minor medium grained gabbro-diabase
and gabbro-pegmatite intrusions; rare pods of black peridotite; screens
of flows, volcaniclastics, minor argillite, and rare chert (Mt. Cairnes
Gabbro-Greenstone Complex; Steel Ck-Mt Constantine Gabbro Complex) |
DEVONIAN TO UPPER TRIASSIC AND (?)
OLDER |
|
|
DTrI: ICEFIELD
a grouping of diverse, dominantly upper
Paleozoic partly equivalent strata subdivided into three dominant facies
including pelitic rocks (1), carbonate (2) and volcanics (3)
| 1. |
thin to medium-bedded,
fine- to medium-grained, quartz-rich, micaceous, calcareous siltstone to
sandstone, mica quartzite, or schist; minor interbedded phyllite, argillite
and schist; rare limestone, marble, basic volcanics, and gypsum-anhydrite |
| 2. |
white to creamy-white
gypsum and anhydrite; thin-bedded to massive, light grey to dark bluish-grey
limestone or marble; minor dark grey calcareous argillite, calcareous siltstone-sandstone;
local buff-grey crinoidal limestone |
| 3. |
dark green (locally
purple), porphyritic (augite) and non-porphyritic basaltic to andesitic
flows and pillow lava; local volcaniclastic sediments, agglomerate, breccia,
cherty tuff, grey limestone or marble, gypsum and basic intrusions |
|
SILURIAN AND DEVONIAN |
|
|
SDB: BULLION
a grouping of carbonate (1) and clastic
(2) strata that may be in part equivalent
| 1. |
massive to well-bedded
light grey limestone or marble, thin-bedded dark grey limestone or marble;
minor dark blue-grey calcareous argillite or phyllite (Bullion Creek
Limestone) |
| 2. |
dark blue-grey argillite,
phyllite, and minor greywacke siltstone-sandstone; upper part more calcareous,
lower part more greywacke; locally may include massive limestone and greenstone |
|
LOWER ORDOVICIAN TO DEVONIAN AND (?)
OLDER |
|
|
ODG: GOATHERD
a grouping of carbonate (1) and clastic
(2) strata that may be in part equivalent
| 1. |
yellow to ochre-buff
calcareous mudstone-siltstone, grey silty limestone and platy to thick
bedded, cryptocrystalline limestone; local well-bedded, limestone; thick
to massive-bedded limestone in upper parts of unit probably equivalent
to SDB1 (Goatherd Mtn. assem.) |
| 2. |
dull rusty-buff
or green-grey greywacke siltstone-sandstone, and argillite or phyllite;
minor grit; rarer limestone, pebble conglomerate, conglomerate; locally
includes quartzite |
|
CAMBRIAN TO ORDOVICIAN AND (?) YOUNGER |
|
|
COD: DONJEK
greywacke greenstone assemblage (1) with
minor carbonate (2)
| 1. |
massive to well-bedded,
coarse- to medium-grained greywacke; minor siltstone-sandstone, argillite,
phyllite or schist, and basic intrusions; conglomerate, basic flows (some
pillowed), pyroclastics(?), and volcanic breccia; greenstone, amphibolite
(N. Alsek Ranges Greywacke-Gabbro assem.; Donjek Range Greywacke-Greenstone
assem.; Field Creek Volcanics) |
| 2. |
light grey to rusty
brown laminated silty limestone and limy siltstone, and well-bedded limestone
or marble; minor greenstone |
|
TERTIARY(?) AND QUATERNARY |
|
|
TQS: SELKIRK
resistant, brown weathering, columnar
jointed, vesicular to massive basalt flows; minor pillow basalt; basaltic
tuff and breccia (Selkirk Volcanics) |
PLIOCENE |
|
|
PW: WALSH
undivided felsic volcanics (1) and conglomerate,
sandstone, and mudstone (2)
| 1. |
resistant, white
weathering, massive rhyolite. (Walsh Creek) |
| 2. |
resistant, thick
bedded to massive, well-indurated conglomerate with minor interbedded sandstone;
white mudstone with interbedded gritty sandstone and minor coal (Walsh
Creek) |
|
MIOCENE TO PLIOCENE |
|
|
MPMC: MILES CANYON
dark red to brown weathering, columnar
jointed olivine basalt flows, commonly amygdaloidal and vesicular; ultramafic
xenoliths (Miles Canyon Basalt) |
LOWER EOCENE |
|
|
lES: SKUKUM
various felsic volcanic dykes, plugs,
domes, laccoliths and flows (1) and (2)
| 1. |
flow banded rhyolite
flows and breccia, andesite flows and breccia, tuff, pyroclastic and epiclastic
rocks, granite conglomerate; rhyolite feldspar porphyry domes, plugs and
laccoliths; feldspar +/- hornblende +/- quartz-phyric felsite dykes and
plugs (Skukum Gp. including Boudette Creek, Butte Creek, Cleft Mountain,
Crozier Breccia, Crozier Tuff and Lava, Gault, Jones Creek, Lemieux Creek,
MacCauley Creek, Mount Reid, Partridge Lake, Vesuvius and Watson River) |
| 2. |
heterogeneous intermediate
to felsic, hornblende-feldspar porphyritic tuff, flow breccia; volcaniclastic
mudstone, sandstone and conglomerate; aphanitic to feldspar porphyritic
dacite flows and dykes; flow-banded rhyolite and felsic dykes and sills
(Mount Creedon Volcanics, some strata formerly mapped as Mt. Nansen Gp.) |
|
EARLY TERTIARY |
|
|
ETN: NISLING RANGE SUITE
medium to coarse grained equigranular
to porphyritic rocks of intermediate composition (g), fine to coarse grained,
equigranular and porphyritic granitic rocks of felsic composition (q) and
felsic dyke rocks (f)
| f. |
orange and buff
weathering light-coloured feldspar porphyry dyke and flow rocks of intermediate
to acid composition |
| g. |
biotite-hornblende
granodiorite (locally K-feldspar megacrysts), quartz monzonite, quartz
diorite; minor granodiorite-gneiss; hornblende and biotite hornblende diorite;
biotite quartz feldspar porphyry and porphyritic biotite quartz monzonite
(Ruby Range Suite) |
| q. |
leucocratic, biotite
granite; miarolitic alaskite; saccharoidal textured, mafic-poor biotite
granite; biotite-hornblende granite to leucocratic granodiorite with sparse,
white, alkali feldspar phenocrysts; biotite quartz monzonite (Nisling
Range Suite, Nisling Range Alaskite, Coffee Creek Granite, Annie Ned Granite) |
|
UPPER CRETACEOUS |
|
|
uKC: CARMACKS
a volcanic succession dominated by basic
volcanic strata (1), but including felsic volcanic rocks dominantly (?)
at the base of the succession (2) and locally, basal clastic strata (3)
(70 ma approx)
| 1. |
augite olivine basalt
and breccia; hornblende feldspar porphyry andesite and dacite flows; vesicular,
augite phyric andesite and trachyte; minor sandy tuff, granite boulder
conglomerate, agglomerate and associated epiclastic rocks (Carmacks
Gp., Little Ridge Volcanics, Casino Volcanics) |
| 2. |
acid vitric crystal
tuff, lapilli tuff and welded tuff including feeder plugs and necks; felsic
volcanic flow rocks and quartz feldspar porphyries; green and purple massive
tuff-breccia with feldspar phyric fragments (Carmacks Gp., Donjek Volcanics,
some rocks formerly mapped as Mt. Nansen Gp.; the felsic part of the Carmacks
Gp. is difficult to distinguish from similar Tertiary and mid-Cretaceous
(Mt. Nansen) felsic volcanic strata) |
| 3. |
medium-bedded, poorly
sorted, coarse- to fine-grained sandstone, pebble conglomerate, shale,
tuff, and coal; massive to thick bedded locally derived granite or quartzite
pebble to boulder conglomerate (Carmacks Gp.) |
|
UPPER CRETACEOUS |
|
|
uKW: WINDY-TABLE
resistant, columnar jointed, quartz-phyric
dacite flows, ash and lapilli tuff; maroon weathering, basal sedimentary
and epiclastic rocks; dacite flows and flow breccia; brown basalt flows;
includes dykes of quartz feldspar porphyry (80 ma approx) (Open Creek
Volcanics) |
LATE CRETACEOUS TO TERTIARY |
|
|
LKP: PROSPECTOR MOUNTAIN
SUITE
grey, fine to coarse grained, massive,
granitic rocks of felsic (q) intermediate (g) rarely mafic (d) composition
and related felsic dykes (f)
| d. |
coarsely crystalline
gabbro and diorite |
| g. |
hornblende-biotite
granodiorite, hornblende diorite, quartz diorite (Wheaton Valley Granodiorite) |
| q. |
quartz monzonite,
biotite quartz-rich granite; porphyritic alaskite and granite with plagioclase
and quartz-eye phenocrysts; biotite and hornblende quartz monzodiorite,
granite, and leucocratic granodiorite with local alkali feldspar phenocrysts
(Prospector Mountain Suite, Carcross Pluton) |
| y. |
syenite |
| f. |
quartz-feldspar
porphyry |
|
MID-CRETACEOUS |
|
|
mKN: MOUNT NANSEN
massive aphyric or feldspar-phyric andesite
to dacite flows, breccia and tuff; massive, heterolithic, quartz- and feldspar-phyric,
felsic lapilli tuff; flow-banded quartz-phyric rhyolite and quartz-feldspar
porphyry plugs, dykes, sills and breccia (Mount Nansen Gp., Byng Creek
Volcanics, Hutshi Gp.) |
MID-CRETACEOUS |
|
|
mKW: WHITEHORSE SUITE
grey, medium to coarse grained, generally
equigranular granitic rocks of felsic (q), intermediate (g), locally mafic
(d) and rarely syenitic (y) composition
| d. |
hornblende diorite,
biotite-hornblende quartz diorite and mesocratic, often strongly magnetic,
hypersthene-hornblende diorite, quartz diorite and gabbro (Whitehorse
Suite, Coast Intrusions) |
| g. |
biotite-hornblende
granodiorite, hornblende quartz diorite and hornblende diorite; leucocratic,
biotite hornblende granodiorite locally with sparse grey and pink potassium
feldspar phenocrysts (Whitehorse Suite, Casino granodiorite, McClintock
granodiodrite, Nisling Range granodiorite) |
| q. |
biotite quartz-monzonite,
biotite granite and leucogranite, pink granophyric quartz monzonite, porphyritic
biotite leucogranite, locally porphyritic (K-feldspar) hornblende monzonite
to syenite, and locally porphyritic leucocratic quartz monzonite (Mt.
McIntyre Suite, Whitehorse Suite, Casino Intrusions, Mt. Ward Granite,
Coffee Creek Granite) |
| y. |
hornblende syenite,
grading to granite or granodiorite (Whitehorse Suite) |
|
EARLY CRETACEOUS |
|
|
EKgT: TESLIN SUITE
leucocratic, fine to coarse-grained, equigranular,
hornblende- biotite granite, granodiorite, quartz monzonite and quartz
monzodiorite, locally with sparse grey and pink potassium feldspar phenocrysts;
associated aplitic phases and dykes (Teslin Suite) |
UPPER JURASSIC AND LOWER CRETACEOUS |
|
|
uJKT: TANTALUS
massive to thickly bedded chert pebble
conglomerate and gritty quartz-chert-feldspar sandstone; interbedded dark
grey shale, argillite, siltstone, arkose and coal; at one locality includes
red-weathering dacite to andesite flows at base (Tantalus) |
MID-JURASSIC |
|
|
MJB: BRYDE SUITE
undeformed granitic rocks from two plutonic
bodies one of predominantly felsic (q) and the other of intermediate composition
(g)
| q. |
medium to fine grained,
equigranular, leucocratic monzonite, syenite and granite and related dykes
of dacite to andesite porphyry with euhedral andesine, hornblende and locally
quartz in aphanitic greenish, or grey groundmass (Teslin Crossing Stock) |
| g. |
medium grained,
hornblende monzodiorite, hornblende-biotite quartz monzodiorite and minor
hornblendite; pink, potassium feldspar megacrystic, hornblende granite
to granodiorite and associated easterly trending mafic dyke swarms (Mt.
Bryde Pluton; Bennett Granite) |
|
EARLY JURASSIC |
|
|
EJgA: AISHIHIK SUITE
medium- to coarse- grained, foliated biotite-hornblende
granodiorite; biotite rich screens and gneiss schlieren; foliated hornblende
diorite to monzodiorite with local K-feldspar megacrysts; may include unfoliated
monzonite of the Long Lake Suite (Aishihik Suite) |
EARLY JURASSIC |
|
|
EJL: LONG LAKE SUITE
mostly felsic granitic rocks (q) but locally
grading to syenitic (y)
| y. |
resistant, dark
weathering, massive, coarse- to very coarse- grained and porphyritic, mesocratic
hornblende syenite; locally sheared, commonly fractured and saussuritized;
locally has well developed layering of aligned pink K-feldspar tablets
(Big Creek Syenite) |
| q. |
massive to weakly
foliated, fine to coarse grained biotite, biotite-muscovite and biotite-hornblende
quartz monzonite to granite, including abundant pegmatite and aplite phases;
commonly K-feldspar megacrystic (Long Lake Suite) |
|
LOWER AND MIDDLE JURASSIC, HETTANGIAN
TO BAJOCIAN |
|
|
JL: LABERGE
poorly sorted, medium bedded to massive
arkosic sandstone and minor shale with interbeds and thick members of resistant
heterolithic pebble and boulder conglomerate; recessive, dark brown weathering,
thin bedded, dark brown to greenish, silty shale (Laberge Gp.) |
LOWER JURASSIC, PLEINSBACHIAN TO TOARCIAN |
|
|
lJN: NORDENSKIOLD
resistant, reddish brown weathering, massive,
khaki-green dacite tuff with fresh plagioclase, hornblende and biotite;
grades locally to pale green, punky weathering, salt and pepper textured,
massive sandstone; interbedded conglomerate (Nordenskiold Dacite) |
MESOZOIC |
|
|
Mg: MESOZOIC GRANITIC ROCKS
UNDIVIDED
poorly described granitic rocks of uncertain
age including diorite, quartz monzonite, and monzonite |
LATE TRIASSIC |
|
|
LTrgS: STIKINE SUITE
coarse-grained, foliated, gabbroic hornblende
orthogneiss; coarse-grained hornblende-biotite granite and granodiorite
with K-feldspar megacrysts; foliated, fine- to medium-grained hornblende
quartz diorite to diorite with minor biotite (Tally Ho Leucogabbro,
Little River Batholith, Friday Creek diorite) |
UPPER TRIASSIC, CARNIAN TO NORIAN |
|
|
uTrAK: AKSALA
mixed clastic-carbonate assemblage divisible
into three dominant facies including calcareous greywacke (1), locally
thick carbonate (2) and red-coloured clastics (3) (Aksala)
| 1. |
brown shale, black
and minor red siltstone, greenish, calcareous greywacke and interbedded
bioclastic, argillaceous limestone; igneous- or limestone-clast pebble
and cobble conglomerate; lahaaric debris flows; rare feldspar-augite porphyry
flows (Casca mb. of Aksala) |
| 2. |
massive to thick
bedded limestone; minor thin bedded argillaceous to sooty limestone; coarsely
crystalline, massive dolostone; minor laminated chert; massive to poorly
bedded, limestone conglomerate debris flows and fanglomerate (Hancock
mb. of Aksala) |
| 3. |
red weathering,
medium bedded, green and red greywacke and pebble conglomerate; red shale
partings and minor interbedded, red, bioturbated siltstone; crystal-rich
greywacke and shale; coarse-grained, tan to brown, massive, lithic arenite
(Mandanna mb. of Aksala) |
|
UPPER TRIASSIC, CARNIAN AND OLDER (?) |
|
|
uTrP: POVOAS
augite or feldspar phyric, locally pillowed
andesitic basalt flows, breccia, tuff, sandstone and argillite; local dacitic
breccia and tuff with minor limestone; greenschist, chlorite schist, chlorite-augite-feldspar
gneiss, amphibolite (Povoas) |
MIDDLE TRIASSIC |
|
|
mTrJ: JOE MOUNTAIN
massive basalt flows; fine- to locally
medium-grained feldspar and pyroxene?-phyric, pillowed andesite; variably
altered massive microdiorite; heterolithic diamictite; coarse-grained and
locally pegmatitic, hornblende gabbro and diorite (Joe Mountain Volcanics) |
UPPER PALEOZOIC |
|
|
uPT: TAKHINI
variably sheared and metamorphosed metabasite,
amphibolite gneiss, tuff, wacke and marble with minor quartz mica schist
and orthogneiss |
PROTEROZOIC TO MESOZOIC |
|
|
PMm: UNDIVIDED METAMORPHICS
dark purplish brown staurolite cordierite
biotite hornfels with relict schistose texture; quartz-sericite-chlorite
schist; minor quartzite (metamorphosed Jura-Cretaceous Dezadeash Gp.?
and undivided Nisling assem.) |
DEVONIAN TO CRETACEOUS? |
|
|
PMW: WINDY
oceanic assemblage of ultramafic rocks
(1), greenstone (2), chert (3) and carbonate (4) and metamorphosed equivalents?
(5)
| 1. |
dun-brown weathering,
dark green to black, partly serpentinized massive harzburgite and dunite |
| 2. |
sheared and foliated
greenstone and related volcanic rocks; minor cherty tuff |
| 3. |
interbedded brown
argillite, cherty slate and quartzite |
| 4. |
thin-bedded limestone
and marble |
| 5. |
quartz-chlorite-sericite
schist, epidote-actinolite greenschist, quartzite, slate, quartz-mica schist,
limestone |
|
MIDDLE PERMIAN |
|
|
PqS: SULPHUR CREEK SUITE
moderately to strongly foliated biotite
quartz monzonite gneiss, the Sulphur Creek Orthogneiss; coarse grained,
homogeneous, hornblende-biotite-bearing granite, granodiorite and quartz-monzonite
with narrow foliated and mylonitic zones of the Ram Stock (Sulphur Creek
Orthogneiss, Ram Stock) |
CARBONIFEROUS AND PERMIAN |
|
|
CPK: KLONDIKE SCHIST
poorly understood assemblage of metamorphosed
pelitic/volcanic rocks (1) and minor marble (2), including phyllite of
uncertain association (3)
| 1. |
tan to rusty and
black weathering muscovitic and/or chloritic quartzite and quartz-muscovite-chlorite
schist; quartz and/or feldspar augen-bearing quartz-muscovite (+/-chlorite)
schist; includes augen gneiss and amphibolite (Klondike Schist) |
| 2. |
resistant, white
weathering, white sugary marble with a ductile flow fabric; crystalline
marble (Klondike Schist) |
| 3. |
silvery grey muscovite
chlorite quartz phyllite |
|
PROTEROZOIC AND PALEOZOIC |
|
|
PPa: AMPHIBOLITE
metamorphosed mafic rocks including amphibolite
(1) and ultramafic rocks (2) of unknown association; i.e.) may belong in
part or entirely to Nisling, Nasina, and Slide Mountain assemblages and
(3), mafic-ultramafic intrusions within Nasina assemblage
| 1. |
medium to dark green
weathering chlorite (+/-biotite) schist, amphibolite, banded amphibolite
gneiss, garnet amphibolite; minor chloritic quartz-mica schist, graphitic
quartz-mica schist, quartzite, and limestone |
| 2. |
variably altered
and serpentinized ultramafic rocks |
| 3. |
calcareous actinolite-plagioclase-chlorite-biotite
schist, plagioclase-actinolite-chlorite schist, and lesser carbonaceous
phyllite and quartzite; metamorphosed ultramafic rocks including dunite
and pyroxenite, locally serpentinized |
|
LATE DEVONIAN TO MISSISSIPPIAN |
|
|
DMPE: PELLY GNEISS SUITE
- NORTHEAST
variably deformed granitic rocks of predominantly
felsic (q) to intermediate composition (g) northeast of Tintina Fault
(Simpson Range Suite)
| q. |
resistant, medium
grey weathering, porphyritic (pink K-feldspar) biotite quartz monzonite;
generally fresh to weakly saussuritized, locally shattered and recemented |
| g. |
massive, resistant.,
medium grey weathering, blocky, dark green protomylonite and mylonite derived
from hornblende granodiorite to quartz diorite; granitic gneiss |
|
LATE DEVONIAN TO MISSISSIPPIAN |
|
|
DMPW: PELLY GNEISS SUITE
- SOUTHWEST
variably deformed granitic rocks of predominantly
felsic (q) to intermediate composition (g) southwest of Tintina Fault
| q. |
foliated equigranular
medium-grained muscovite quartz monzonite; moderately to strongly foliated
K-feldspar augen-hearing quartz monzonitic to granitic gneiss (S. Fiftymile
Batholith, Mt. Burnham Orthogneiss,) |
| g. |
foliated medium
grained, homogeneous biotite granite gneiss to biotite or hornblende granodiorite
gneiss; massive to strongly foliated dioritic to granodioritic gneiss;
includes interfoliated amphibolite, quartz-mica schist and phyllite
(Selwyn Gneiss, Pelly Gneiss, N. Fiftymile Batholith, Moose Creek Orthogneiss) |
|
DEVONIAN, MISSISSIPPIAN AND(?) OLDER |
|
|
DMN: NASINA
graphitic quartzite and muscovite quartz-rich
schist (1), (3)-(5), and(?) (6) with interspersed marble (2) and probable
correlative successions (7) - (9)
| 1. |
dark grey to black,
fine grained graphitic and non-graphitic quartzite, grey micaceous quartzite
and quartz muscovite (+/-chlorite; +/- feldspar augen) schist, locally
garnetiferous; minor graphitic stretched metaconglomerate and metagrit
(Nasina assem.) |
| 2. |
marble (Nasina
assem.) |
| 3. |
quartzite, micaceous
quartzite, quartz muscovite (+/-chlorite; +/- feldspar augen) schist, and
minor metaconglomerate and metagrit as in (1), but may locally include
significant Nisling Assemblage |
| 4. |
quartzite, micaceous
quartzite, quartz muscovite (+/-chlorite; +/- feldspar augen) schist, and
minor metaconglomerate and metagrit as in (1), but may locally include
significant Klondike Schist Assemblage |
| 5. |
black-weathering,
massive, dark grey to black strongly graphitic quartzite with lesser grey
micaceous quartzite and quartz mica schist; commonly shows alternating
light and dark grey colour lamination (Nasina quartzite) |
| 6. |
biotite schist or
gneiss; association uncertain, may belong to Nisling Assemblage |
| 7. |
medium green to
yellow green muscovite-chlorite-actinolite-epidote-albite +/-biotite schist
to quartz-rich schist, local albite porphyroblasts; green and yellow banded
biotite+/-magnetite schist (metatuff?); micaceous quartzite; minor metachert
(Hazel) |
| 8. |
hornblende-oligoclase-quartz+/-biotite
+/-actinolite mafic gneiss and schist; hornblende amphibolite; sheared
metaplutonic rock with interleaved quartzite and muscovite+/- biotite+/-oligoclase+/-garnet
schist; bands of quartzofeldspathic melt (Dorsey) |
| 9. |
fine grained actinolite+chlorite-muscovite+/-epidote
phyllite and schist; calcareous metavolcanic rocks; quartzite; marble;
sheared felsic to intermediated metaplutonic rocks; minor calcareous green
metasiltstone or metatuff and sandy metacarbonate (Ram Creek) |
| 10. |
eclogite |
|
LATE PROTEROZOIC AND PALEOZOIC |
|
|
PPN: NISLING
assemblage characterized by mica quartz
feldspar schist (1) and abundant locally thick limestone members (2); (3)
includes possibly equivalent strata northeast of Tintina Fault
| 1. |
dark grey to brown,
biotite-muscovite-quartz-feldspar schist, quartzite and micaceous quartzite,
garnetiferous; felsic chlorite-biotite orthogneiss; rare amphibolite; minor(?)
two-mica gneiss and hornblende diorite gneiss; may include Nasina Assem.
(Nisling assem.) |
| 2. |
bleached white-weathering,
white to grey, coarsely crystalline, flow banded, fetid marble; graphite,
chert, metabasite and calc-silicate lamina are common (Nisling assem.) |
| 3. |
calcareous quartz
psammite, marble, calcareous chlorite-biotite schist and calcsilicate;
calcareous garnet-biotite-muscovite schist, rare amphibolite; biotite-quartz-muscovite
schist and lesser quartz-feldspar-muscovite augen schist (assignment
uncertain, could belong to DMN (Nasina)) |
|
QUATERNARY |
|
|
Q: QUATERNARY
unconsolidated glacial, glaciofluvial
and glaciolacustrine deposits; fluviatile silt, sand, and gravel, and local
volcanic ash, in part with cover of soil and organic deposits |
UPPER TRIASSIC |
|
|
uTrS: SYNOROGENIC CLASTICS
resistant, massive, poorly sorted, conglomerate
with pebble to cobble size clasts varying locally but including basalt,
chert, mylonite, limestone, foliated hornblende granodiorite and quartz
monzonite |
TRIASSIC |
|
|
uTrA: ANVIL
weakly deformed, thin bedded argillite,
fine grained quartz sandstone and argillaceous limestone |
CARBONIFEROUS AND PERMIAN |
|
|
CPA: ANVIL
dominantly oceanic assemblage of mafic
volcanics (1), ultramafics (4), chert and pelite (2), limestone (3) and
gabbroic rocks (5)
| 1. |
variably altered
and foliated, locally augite-phyric basalt (local pillows), diorite and
gabbro, chloritic greenstone, amphibolitic greenstone and amphibolite;
minor metachert, siliceous argillite or siltstone, greywacke, tuff, and
siliceous limestone |
| 2. |
varicoloured metachert
with partings or interbeds of phyllite and tuffaceous argillite; interbedded
jasper red and apple green chert and cherty tuff; chert breccia; shale,
minor greenstone, agglomerate, limestone, quartzite(?) and greywacke |
| 3. |
light grey to buff
weathering, massive fine crystalline, light to dark grey limestone and
minor dolomite; light grey, massive, crinoidal limestone; limestone and
polymictic conglomerate; sandy limestone, cherty limestone; marble, phyllite,
meta-siltstone |
| 4. |
dunite, peridotite,
gabbro, pyroxenite, harzburgite and minor diorite, hornblendite and diabase;
serpentinite, orange weathering quartz carbonate rock with minor green
chromian muscovite, talc-carbonate schist and carbonatized ultramafic rocks |
| 5. |
dominantly diorite,
quartz diorite, and gabbro with lesser pyroxenite or other ultramafic rocks;
variably altered and foliated; local dioritic orthogneiss |
| 6. |
eclogite |
|
CARBONIFEROUS TO PERMIAN |
|
|
CPSR: SWIFT RIVER
black to rusty-red siliceous graphite-muscovite
phyllite and interlayered black ribbon chert and black massive chert; white
to black quartzite (metachert?); minor quartz-feldspar grit and sandstone;
minor matrix supported chert-pebble conglomerate |
UPPER TRIASSIC TO LOWER JURASSIC |
|
|
uTrJS: SHONEKTAW
augite-bearing greywacke and lesser siltstone
and shale, possibly resedimented pyroclastic deposits; minor(?) augite-feldspar
crystal tuff; minor volcanic breccia with clasts of augite (+/- feldspar)
porphyry (equivalent to Shonektaw, northern B.C.) |
CARBONIFEROUS |
|
|
CK: KLINKIT
little metamorphosed assemblage divided
into dominant lithologies including mafic volcanics (1), epiclastics (3),
phyllite and quartzite (4) and carbonate lenses and horizons (2) dispersed
within these
| 1. |
medium to dark green
to purple-grey, locally amygdaloidal or vesicular intermediate to mafic
volcanic flows, flow breccias, volcanic fragmentals and tuffs; blocks of
calc-silicate common in the breccias and fragmentals |
| 2. |
grey to black, fine
crystalline to recrystallized, bedded, locally crinoidal and coralline,
limestone and reddish dolostone with beds, lenses and nodules of white
to green chert; beds and lenses of volcanic rocks; cherty limestone; |
| 3. |
epiclastic siltstone,
sandstone and conglomerate; welded and siliceous, tuffaceous siltstone,
sandstone and conglomerate; banded tuff and cherty tuff; ribbon chert,
calc-silicate; glassy quartz-grit, quartzite, shale, slate; local rapid
facies changes |
| 4. |
muscovite-chlorite
phyllite; impure, fine-grained quartzite and siltstone, locally limey;
local massive, sheared, dark, fine grained quartzite; limestone lenses
(2); in uncertain contact overlying(?) lithologically similar Road River
Cassiar (Nasina) |
|
UPPER CARBONIFEROUS, LOWER AND MIDDLE
PENNSYLVANIAN |
|
|
uCS: SEMENOF
resistant, massive, dark green, altered
andesite and basalt, volcanic breccia, tuff and greenstone; minor rhyolite
breccia and argillite; possibly equivalent ot the Klinkit assemblage?
(Semenof) |
UPPER CARBONIFEROUS, LOWER AND MIDDLE
PENNSYLVANIAN |
|
|
uCB: BOSWELL
assemblage of recessive mixed clastic
strata and minor greenstone (1), altered mafic volcanics (2), gabbro (3)
and limestone (4); possibly equivalent to the Klinkit assemblage? (Boswell)
| 1. |
recessive, dark
weathering, slate, phyllite, greywacke chert, chert conglomerate and breccia,
volcanic breccia, greenstone and limestone (Boswell) |
| 2. |
resistant, massive,
dark green, altered basalt, volcanic breccia and greenstone; distinguished
from Semenof volcanics by stratigraphic context. (Boswell) |
| 3. |
massive, dark weathering,
coarse to medium grained, hornblendite-gabbro (Boswell) |
| 4. |
white weathering,
massive to thick bedded, resistant, grey, micritic limestone (Boswell) |
|
MIDDLE TRIASSIC TO LOWER JURASSIC |
|
|
mTrlJC: CACHE CREEK
well bedded ribbon chert interbedded with
shale, siltstone and greywacke (Cache Creek Gp.) |
CARBONIFEROUS TO JURASSIC |
|
|
CTrC: CACHE CREEK
oceanic assemblage of ultramafic rocks
(1), volcanics (2), carbonate (3) and ribbon chert (4)
| 1. |
dark rusty to dun
brown weathering, strongly magnetic, variably tectonized, serpentinized
and chloritized ultramafic rocks including medium to coarse grained hornblende-pyroxene
diorite gabbro, peridotite, dunite, serpentinite, and pyroxenite (Cache
Creek Gp.) |
| 2. |
andesitic and basaltic
spherulitic greenstone, locally pillowed; aphanitic, tuffaceous(?) greenstone
with clasts of limestone and chert; altered volcanic rocks with numerous
serpentine bodies; massive, fine-grained metabasite and hornblende diorite
(Cache Creek Gp., Nakina) |
| 3. |
massive, finely
crystalline, locally crinoidal and fusiline grey limestone; limestone,
limestone breccia; massive to poorly bedded, medium-grained, recrystallized
white to pale yellow limestone and crinoidal bioclastic limestone; rare
dolostone (Cache Creek Gp., Horsefeed) |
| 4. |
resistant, well-bedded,
thin bedded, grey, black, red and brown chert, with lesser cherty sandstone
and siltstone; minor thin limestone beds and pillow lava (Cache Creek
Gp., Kedahda) |
|
QUATERNARY |
|
|
Q: QUATERNARY
unconsolidated glacial, glaciofluvial
and glaciolacustrine deposits; fluviatile silt, sand, and gravel, and local
volcanic ash, in part with cover of soil and organic deposits |
MID-CRETACEOUS |
|
|
mKC: CASSIAR SUITE
medium to coarse grained, equigranular
to porphyritic rocks of largely felsic (q) composition; includes minor
(?) amounts questionably of more intermediate composition (g)
| g. |
granodiorite, biotite-muscovite
granodiorite, quartz diorite, biotite quartz monzonite, granite (Cassiar
Suite) |
| q. |
medium to coarse
grained, equigranular to porphyritic (K-feldspar) granite and biotite quartz
monzonite; biotite-hornblende quartz monzonite and granodiorite (Cassiar
Suite) |
|
MISSISSIPPIAN |
|
|
MyP: PELLY MOUNTAINS SUITE
resistant, massive, medium to fine grained
equigranular syenite; magmatic hornblende replaced by actinolite, but K-feldspar
is fresh perthite; gradational to trachyte; intrusive equivalents to felsic
volcanics of the Earn assemblage |
UPPER TRIASSIC |
|
|
TrJC: JONES LAKE - CASSIAR
calcareous siltstone and shale, commonly
finely cross laminated; dark grey and buff weathering, recessive, thin
bedded locally bioclastic limestone and interbedded sandy or silty limestone |
CARBONIFEROUS |
|
|
CTC: TAY - CASSIAR
dark brown, thin bedded shale and buff-yellow
calcareous siltstone, fine grained sandstone, and medium beds of black
finely crystalline argillaceous limestone; strongly bioturbated |
UPPER DEVONIAN TO LOWER MISSISSIPPIAN |
|
|
DMEC: EARN - CASSIAR
consists upwards of dark clastic rocks
(1) capped by tuffaceous chert (2) and felsic volcanic rocks (3), the chert
and volcanics in part laterally equivalent; intrusive equivalents of the
volcanics are the Pelly Mountains Suite
| 1. |
dark grey, recessive
weathering, thin bedded, black siliceous slate with interbeds and members
of quartz-chert greywacke, chert granule grit and chert pebble to cobble
conglomerate; may include lenses of intermediate to felsic volcaniclastic
rocks |
| 2. |
rusty orange weathering,
resistant, apple green and dark grey, thin bedded chert and cherty tuff;
local nodular and bedded barite |
| 3. |
heterogeneous, rusty,
black, white, and orange weathering rhyolite-trachyte to andesite flows,
breccias and tuffs; locally highly pyritic; local black slate and grey-green
cherty tuff; minor fine crystalline limestone; locally abundant trachyte
dykes |
|
MIDDLE SILURIAN TO MIDDLE DEVONIAN |
|
|
SDA: ASKIN
platy dolomitic siltstone (1) overlain
by dolostone and orthoquartzite (2) with rare volcanics (3)
| 1. |
tan, medium grey
and locally maroon weathering, light grey, thin bedded to platy dolomitic
siltstone, dolomitic fine grained sandstone and minor silty dolomite
(Askin Gp.) |
| 2. |
medium grey to buff
weathering, medium to thick bedded dolomite, silty and sandy dolomite,
limestone; medium to thick bedded, medium grained mature orthoquartzite;
dolomitized laminated mudstone and dolomite with vugs, birdseye and fenestral
cavities (Askin Gp.) |
| 3. |
orange weathering,
recessive, maroon and green lapilli tuff and volcanic breccia with interbedded
bioclastic dolomite (Askin Gp.) |
|
CAMBRIAN TO DEVONIAN OR YOUNGER |
|
|
CDS: ST. CYR
poorly understood, fine clastic and carbonate
assemblage, (1) to (5), with only general similarities to equivalent strata
elsewhere in Cassiar Mountains; overlain by strata typical of Earn, Tay
and Jones Lake assemblages elsewhere
| 1. |
orange to brown
weathering, recessive, medium grey interlaminated calcareous shale and
silty limestone or calcareous siltstone; proportion of carbonate to clastic
material varies widely; includes slaty and phyllitic equivalents (Cambro-Ordovician?) |
| 2. |
orange brown weathering,
recessive, thin bedded, medium to dark grey, calcareous. shale, siltstone
and argillaceous. limestone; includes slate and phyllitic slate (Cambrian
to Lower Devonian?) |
| 3. |
black, recessive
weathering, calcareous graphitic "sooty" slate and silty shale; includes
thin beds of dark grey graphitic, very fine grained quartzite and black
"sooty" crinoidal limestone (Ordovician and Silurian?) |
| 4. |
orange buff weathering,
medium grey, thin to medium bedded, finely laminated and cross-laminated
calcareous quartz siltstone and very fine grained orthoquartzite, with
slaty phyllite partings; minor massive, light grey orthoquartzite (Siluro-Devonian?) |
| 5. |
orange to dark blue-grey
phyllite and thinly laminated phyllitic limestone; minor laminated siltstone,
green slate, and rare chert; platy, fetid limestone, locally crinoidal;
minor shale, basalt, tuff and breccia (Upper Devonian or younger?) |
|
ORDOVICIAN TO DEVONIAN, LOCALLY ?MISSISSIPPIAN |
|
|
ODRC: ROAD RIVER - CASSIAR
fine grained, graphitic clastics of dominantly
Ordovician and Silurian age (1), but in places including Upper Silurian
and Devonian equivalents (2)
| 1. |
recessive, black,
locally calcareous, fissile, graptolitic shale; local thick to very thick
interbeds of grey quartz arenite; includes thin sills or flows of dark
green basalt undifferentiated |
| 2. |
recessive, dark
grey to black "sooty" limey or dolomitic thin-bedded to platy graphitic
siltstone and fine grained impure quartzite with interbedded graphitic
silty shale (Nasina) |
|
UPPER CAMBRIAN AND LOWER ORDOVICIAN |
|
|
COK: KECHIKA
basinal fine grained calcareous pelitic
strata (1) with locally intercalated mafic volcanics (2)
| 1. |
thin bedded, lustrous,
calcareous, grey slate, phyllite, limestone, minor grey dolomite and dolomitic
limestone; quartz-carbonate veins; minor sills and flows of basalt and
basaltic tuff ; may include Ordovician black slate at top of succession
(Kechika) |
| 2. |
massive, dark green
and maroon amygdaloidal basalt flows and volcaniclastics; medium to fine
grained diabase or diorite sills with chilled margins; medium grey, chlorite
muscovite quartz phyllite with abundant undifferentiated lenses of "greenstone" |
|
LOWER CAMBRIAN |
|
|
lCR: ROSELLA
resistant, thick bedded to massive, limestone
and argillaceous limestone; local archaeocyathid buildups, trilobite fragments,
oolites, and pisolites; pisolitic massive dolomite and limestone; marble,
calc-silicate, calcareous phyllite and minor schist (Rosella) |
LOWER CAMBRIAN |
|
|
lCB: BOYA
light grey to medium brown, fine to medium
grained quartz arenite and interbedded argillite, slate, siltstone, phyllite
and minor limestone (Boya) |
UPPER PROTEROZOIC TO LOWER CAMBRIAN |
|
|
PCI: INGENIKA
consists upwards of coarse quartzose clastics
overlain by fine clastics (1), a marble horizon (2), and fine clastic strata
(3); laterally equivalent similar fine clastics (4) are mostly (?) correlative
to the upper part of this succession
| 1. |
calcareous sandstone,
shale, quartz-eye grit, quartzite, micaceous quartzite and minor grey limestone
generally overlain by phyllite, quartzite, and dolomitic marble; muscovite-chlorite
schist, biotite schist, meta-sandstone and minor calc-silicate (Swannel
and Tsaydiz of the Ingenika Gp.) |
| 2. |
marble, minor dolomite,
calc phyllite (Espee of the Ingenika Gp.) |
| 3. |
phyllite, quartzite,
minor micaceous meta-sandstone (Stekluz of the Ingenika Gp.) |
| 4. |
thin bedded slate,
siltstone, quartzite and minor limestone with local medium to coarse grained,
feldspathic sandstone to orthoquartzite; muscovite biotite +/- garnet schist,
micaceous quartzite, minor amphibolite and marble; rare granodiorite gneiss
(Ketza Gp., Harvey Gp.) |
|
QUATERNARY |
|
|
Q: QUATERNARY
unconsolidated glacial, glaciofluvial
and glaciolacustrine deposits; fluviatile silt, sand, and gravel, and local
volcanic ash, in part with cover of soil and organic deposits |
LOWER TERTIARY, MOSTLY(?) EOCENE |
|
|
lTR: ROSS
mixed bimodal volcanics (basalt (1), rhyolite
(2)) and terrestrial clastics (3), dominantly along or near Tintina Fault;
farther removed, scattered occurrences of rhyolitic lava and dikes (4)
are also included
| 1. |
locally amygdaloidal,
dark grey-green olivine basalt necks and flows; subaerial and subaqueous
(locally pillowed); volcaniclastic rocks; minor olivine gabbro; locally
plagioclase-phyric basalt and diabase dykes; minor shale and conglomerate |
| 2. |
rhyolite flows,
tuffs, ash-flow tuffs and breccias, locally laminated; small stocks and
necks of white weathering, flow-banded, quartz-sanidine porphyry to granite
porphyry, locally obsidian bearing; local shale, sandstone and conglomerate |
| 3. |
brown, thin bedded,
claystone, siltstone, shale and coal; arkosic or chert rich, thick bedded
micaceous sandstone; thick bedded to massive pebble to boulder, chert-quartz
conglomerate |
| 4. |
light coloured felsic
quartz feldspar porphyry and rhyolite; minor acid tuff breccia, crystal
lithic tuff and ignimbrite; quartz-feldspar porphyry stocks and dykes |
|
LATE CRETACEOUS |
|
|
LKqM: MCQUESTON SUITE
medium- to coarse-grained, locally porphyritic
and K-feldspar megacrystic biotite +/- muscovite granite and quartz monzonite; |
MID-CRETACEOUS |
|
|
mKT: TOMBSTONE SUITE
plutonic suite dominated by felsic (q)
to syenitic (y) compositions
| y. |
medium- to coarse-grained
biotite-hornblende-clinopyroxene syenite, quartz syenite; tourmaline orbicular
granite; hornblende +/- biotite alkali-feldspar syenite; hornblende-biotite
monzogranite; clinopyroxenite, diorite, and pseudoleucite tinguaite
(Tombstone Suite) |
| q. |
medium- to coarse-grained,
locally porphyritic biotite +/- horn-blende, clinopyroxene granite, quartz
monzonite and granodiorite (Tombstone Suite) |
|
MID-CRETACEOUS |
|
|
mKS: SELWYN SUITE
plutonic suite of intermediate (g) to
more felsic composition (q) and rarely syenitic (y); equivalent felsic
dykes (f); complete compositional gradation so that these designations
are somewhat arbitrary
| f. |
felsic dykes
(Selwyn Suite) |
| y. |
mainly hornblende
and hornblende/biotite syenite, commonly porphyritic (potassium feldspar
phenocrysts), uneven textured, mostly medium grained, locally fine or coarse
grained; minor diorite; hornblende syenite (Selwyn Suite) |
| q. |
equigranular to
porphyritic (K-feldspar) biotite +/- hornblende +/- muscovite granite,
quartz monzonite and granodiorite; porphyritic biotite hornblende granite
with large smoky grey quartz phenocrysts and locally K-feldspar phenocrysts
(Selwyn Suite) |
| g. |
resistant, blocky,
fine to coarse grained equigranular to porphyritic (K-feldspasr) biotite
quartz monzonite and granodiorite and minor quartz diorite; minor leuco-quartz
monzonite and syenite (Selwyn Suite) |
|
MID-CRETACEOUS |
|
|
KSF: SOUTH FORK
dark brown weathering, locally columnar
jointed, massive, densely welded, biotite-quartz-hornblende-feldspar crystal
tuff (South Fork Volcanics) |
TRIASSIC |
|
|
TrG: GALENA SUITE
massive, medium-grained hornblende diorite
and gabbro sills; massive chloritic and locally serpentinized greenstone
(diorite, gabbro, and altered equivalents) sills; minor occurrences of
possible mid- to Late Paleozoic age |
MIDDLE TO UPPER TRIASSIC |
|
|
TrJ: JONES LAKE
brown to buff weathering, calcareous fine
grained sandstone, argillite and shale; extensive ripple cross-lamination
and bioturbation; massive,light grey weathering, fine crystalline, dark
grey limestone; minor orange weathering platy limestone (Jones Lake) |
CARBONIFEROUS TO PERMIAN |
|
|
CPMC: MOUNT CHRISTIE
burrowed, interbedded greenish grey cherty
shale and green shale; thin to medium bedded, light grey-green to black
chert; black siliceous slate and siltstone; minor quartzite, limestone
and dolostone; locally abundant, large grey barite nodules (Mount Christie) |
CARBONIFEROUS TO PERMIAN |
|
|
CPT: TSICHU
thin to medium bedded, siliceous calcarenite,
dolomite, sandy dolomite and minor grey quartzite; buff and grey weathering,
thick bedded, dark grey bioclastic limestone; black to silvery shale; minor
chert, and chert-pebble conglomerate (Tsichu) |
MISSISSIPPIAN |
|
|
MK: KENO HILL
massive to thick bedded quartz arenite;
thin to medium bedded quartz arenite interstratified with black shale or
carbonaceous phyllite; local scour surfaces and shale intraclasts; locally
foliated and lineated (Keno Hill Quartzite) |
MISSISSIPPIAN |
|
|
MT: TAY
mixed, generally fine clastic and carbonate
assemblage (1) with locally thick regionally mappable carbonate horizons
(2)
| 1. |
recessive, dark
brown weathering, | |