Table of Formations

General Geology

Lithology
Till, gravel, sand, clay,
alluvium

Basalt, tuff; gabbro dyke

Rhyolite,
basalt; breccia, tuff; minor
conglomerate

dacite, andesite,

Argillite, arkose, breccia, tuff,
andesite, basalt

Granodiorite, diorite, granite,

syenite,
mon-

quartz  diorite,
quartz monzonite,
zonite, gabbro

Era Period or epoch Group or formation
Pleistocene and Recent
Cenozoic |——
UNCONFORMITY
Oligocene or later
UNCONFORMITY
|
Mesozoic | Upper Cretaceous to Ootsa Lake group
Or. Oligocene
Cenozoic |,
|
Norv IN CONTACT
Lower Cretaceous |
NoONCONFORMITY, POSSIBLY FAULT CONTACT, WITH HAZELTON GROUP, INTRUSIVE
CONTACT WITH PART oF Coast INTRUSIONS
Upper Jurassic (?) and] Coast Intrusions
later
INTRUSIVE CONTACT
Mesozoic

Middle Jurassic (main-|, Hazelton group

ly)

Breccia, tuff, andesite, dacite,
rhyolite, basalt; argillite,
greywacke, chert, conglo-
merate; minor limestone

UNCONFORMITY BETWEEN LOWER JURASSIC ROCKS AND HazELTON GROUP
FAULT CONTACT BETWEEN Upper TRIASSIC ROCKS AND HaZzELTON GROUP

Lower Jurassic
Upper Triassic

and

Takla group

Breccia, tuff, andesite, argil-
lite

Jurassic and older

Metamorphic complex;
largely Hazelton group
but may include older
rocks; cut by Coast In-
trusions

Greenstone, amphibolite,
phyllite, schist, gneiss, re-
crystallized limestone; un-
differentiated minor granite
and diorite

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