QUATERNARY

TERTIARY

MESOZOIC

LOWER JURASSIC -

LEGEND

PLEISTOCENE
AND RECENT

Stratified gravel, sand and clay;
muuskeg.

Masset formation |
Basalt tlows and agglomerates.

PLIOCENE -
MIOCENE (?)

MIOCENE
Skonun formation
Sandstone, shale and conglomerate,
with. lignite; in part unconsolidated.
EOCENE (?)
Etheline formation
Dacite and. andesite dykes and sills;
trachyte of Masset formation om
Harrison Island, Juskatla Initet,
wn
Ww
c
Skidegate formation 5
Sandstone and shale.
w
b
—
UPPER g
CRETACEOUS Honna formation e
Conglomerate and. sandstone. 2
0
Pes a
w
LC 3 wu
Haida formation >
Sandstone and shale. o
Contains coal horizons.
UPPER 3
YURASSIC
Diabase
MIDDLE
JURASSIC

Yakoun formation
Basalt agglomerates and minor flows.

TRIASSIC (?)

Maude formation
Banded argillites and tuffaceous rocks.

Symbols

Geological boundary
(position. determined /

Geological boundary

(probable error off location:
less thare hal? a mila}

Geological boundary
eesti atone sulle

Geological boundary
(position. assumed)

Fault
(position. determined /

Fault :
(probable error of location
less than, one mile}

Fault
(position assumed)

Outcrop of coal horizon

seers

Borehole

Elevation in feet above sea-level

Dip and strike

To accompany Memoir by JD. MacKenxie

x
3
3
Oe

Dawson
Harbour

Canada
Departurent of Mines

_ Hon. P.E.BLonoin, MINISTER; R.G.M©CoNNELL, DEPUTY MINISTER

GEOLOGICAL SURVEY

Camp Wilson

Sections along lines AB, CD and EF.

Horizontal and vertical scale, same as map.

.~ Dawson |

13210 132"

131'so0

)
gue a
&
ol So se
at
z
i}

Wad
a

N

sy

~~

SS

C0. Senécal, Geographer and Chief Draughtsman.
A.MS Gregor, Dieta erneoe

oe

Scale: 35 Miles to 1 Inch

(South I)

40°

Ji

ot

Longitude West from Greenwich

MAP 177A
Issued 1916)

Southern portion of

AHA {SLAND
QUEEN CHARLOTTE ISLANDS
BRITISH COLUMBIA

7

4
Av 4
‘aA a

1
Seale 126,720
Miles

Kilometres
4 5

a o 1 2 3 6 7 8 2 10

2 MILES TO | INCH

TABLE MT
16/0"

1598

GEOLOGY

J. D. MACKENZIE 1913, 19/4.

GEOGRAPHY

BRITISH ADMIRALTY Ano
DEPARTMENT OF THE NAVAL
SERVICE OF CANADA,
DEPARTMENT OF LANDS,
BRITISH COLUMBIA,

J. D. MACKENZIE,

PUBLISHED CHARTS.
TOWNSHIP PLANS
AND SURVEYS.
SURVEYS 19/3, 19/4.

GEOLOGICAL NOTES

SUPERFICIAL DEPOSITS (Pleistocene and Recent). Glacial
till and stratified gravels, sands and clays, of glacial origin;
alluvial deposits and muskegs.

MASSET FORMATION (Pliocene-Miocene). Bedded basalt
flows, agglomerates and tuffs, with contemporaneous dykes
and sills; on Harrison island in Juskatla inlet there is a
trachyte flow in this formation, and there may be others.
Deformation of this formation is moderate but general and,
in places, is severe.

SKONUN FORMATION (Miocene). Sandstones, shales
and conglomerates: in part unconsolidated sands, hard clays
and gravets; lignite is widely distributed. The formation is
eee recy disturbed, though considerably folded and faulted

rally.

ETHELINE FORMATION (Eocene (?)). Dacite and an-
desite dykes and sills, intrusive into all older rocks and es-
pecially abundant in the Maude and Yakoun formations.
There are many areas of these intrusives that cannot be shown
on the map on account of their small size.

QUEEN CHARLOTTE SERIES (Upper Cretaceous) :—

SKIDEGATE FORMATION. Sandstones and shales,
largely of volcanic detritus, containing numerous calcareous
concretionary bands. . Many fossils have been found in the
formation.

HONNA FORMATION.—Mostly coarse conglomerates with
well rounded pebbles of various rocks; the central portion of
the formation is largely coarse, cross-bedded sandstone.

HAIDA FORMATION.—Fossiliferous sandstones and shales
of various textures and compositions largely of volcanic
detritus and, typically, in lenticular beds; coarser near the
base than elsewhere and greatly cross-bedded. Coal occurs at
two horizons, and possibly at others.

The Queen Charlotte series occupies synclinal basins
which are complicated by lesser folds and by faults.

BATHOLITHIC INTRUSIVES (Upper Jurassic). The Kano
and Langara quartz diorites are grey, medium even-grained,
plutonic rocks, and are intrusive into the formations of the
Vancouver group named below. The diabase also is considered
te have plutonic affinities.

YAKOUN FORMATION (Middle Jurassic). Basalt and
andesite agglomerates, tuffs and flows strongly folded and
Saulted. The beds near the base are finer and better stratified
than those above and are in many cases highly fossiliferous.

MAUDE FORMATION (Lower Jurassic, Triassic (?)).
Highly fossiliferous calcareous and carbonaceous, banded
argillites and slaty, carbonaceous shales. Tuffaceous beds
occur in the upper portion and, possibly, detrital conglomer-
ates at the base. Deformation is considerable and locally
intense, with severe minor crumpling and faulting.