CENOZOIC

MESOZOIC

LEGEND

y
MODERN
PLEISTOCENE ano RECENT

Recent aluwium and glacial dritt

TERTIARY

| Basaltic lava

(JURASSIC AND,OR, CRETACEOUS
UPPER JURASSIC anpb,or, LOWER CRETACEOUS

5600’
Bett of quartz porph and
eee quartz diorite LY
Coast Range Intrusives ; granite, granodiorite,
JURASSIC
Hazelton. Group; possibly tr part Triasste, av part
Lower Cretaceous. |= sediments; 2=tgneous rocks.
|: angillite,greywacke, quartzite, la tone, turf
2a: mainly massive thagmental rhyolite -dacite
and related types
2b: massive and fragmental rhyolite-dacite and
aug ite porphyrite 4
2c: augite porphyrite and allied tragmental rocks,
augite syenitte,gabbro
2d: amphibolite,minor amounts of fragmental
amphibolite, sediments (mainly as inclusions }
Symbols
Geological boundary ( datineds ie ane 2
Geologtcal boundary (approwWtmate) oo... a SS ee
Fault (detined,approximate) om
Bedding (inclined, vertical, horizontal )...i.unnmonsivin A DS oh
45
SOURCES OF INFORMATION
pee by RG. Me Connell, /9/0, 1911; J.J.O' Neill
1919; "F Sthofield.1920:and by G.Hanson,1920,
1921,and 1926 to 19382.
RELATED PUBLICATIONS
Memoir 175-Portland Canal Area, British Columbia’,
1935 -by G:Hanson; and Map 315 A-~“Mining Properties
in the Portland Canal Area, Cassiar District, British
Columbia’- scale,l inch to 4 miles.
30°

MT. JOHN JAY

ays

_ MT.UPSHUR ~*.
—<

MT. JEFFERSON
COOLIDGE

Scale,l Inch to 100 Miles

Ea:

((

SS

\

|
é

SA

gS

ia \ |
;
IN

Canada
Department of Mines

Hon. W.A.GORDON, MINISTER; CHARLES CAMSELL,DEPUTY MINISTER.

BUREAU OF ECONOMIC GEOLOGY
GEOLOGICAL SURVEY

Issued 1935

eee AN COW SKE

ie ig in
GNSS
yy, f.

5600

45

Dewi ie TA ie

ne m

30’

MAP 307A

PORTLAND CANAL AREA

CASSIAR DISTRICT
BRITISH COLUMBIA

Scale 253-440 or 1 Inch to 4 Miles
Miles

4 o 8 12

Kilometres
5 ° 5 10 15 20

Contour trterval 500 Feet

Legend

International BOURAARY 00.00.0000...
Lake and stream (position approximate),..— <= 2- ~
Boundary of glacier or snow?fteld.......... Bs

Contours (posttion ApprowTnate ) 00.0.0... aE

Surveys and topography by lopographical Division, Bureau
of Economic Geology, Department of Mines; International
Boundary Commissior, Department of the Interior; and by
Canadian Hydrographic Service , Department of Marine.