LEGEND

TERTIARY

CRETACEOUS
UPPER CRETACEOUS

Conglomerate, sandstone

CENOZOIC

LOWER CRETACEOUS
siustterzrseees] FORT ST. JOHN GROUP: shale,

sandstone, sandy shale

MESOZOIC

BULLHEAD GROUP: siltstone, sandstone,

lignitic shale

Shales, calcareous argillite and sandstone,

argillaceous limestone; some chert

CARBONIFEROUS AND (? ) PERMIAN

V/ Limy sandstone, black shale, limestone;
“YW black chert j

Dottie at eee ac

UPPER DEVONIAN AND MISSISSIPPIAN

CT Dark shales; argillite, sandstone, limestone

SILURIAN AND DEVONIAN

MIDDLE SILURIAN AND MIDDLE DEVONIAN
[1 }}_ Limestone, interbedded sandstone;

[Tf basal shale

PALAEOZOIC

CAMBRIAN (? )

Grey sandstone, red conglomerate
i i | Quarizite, slate, argillite; basic dykes

PRECAMBRIAN

Geology by M. Y. Williams, 1943

59° 30°

‘DEVONIAN AND CARBONIFEROUS

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CANADA G

DEPARTMENT OF MINES AND RESOURCES Ee

MINES AND GEOLOGY BRANCH
GEOLOGICAL SURVEY BUREAU OF GEOLOGY AND TOPOGRAPHY

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59° 30

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Compiled by the Topographical 8urvey
Issued 1944

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FORT NELSON TO WATSON LAKE ( se
BRITISH COLUMBIA anp YUKON ®
ADORE Scale: linch to8 miles \
8 4 0) h eA} 16 24 32 ‘ é
| Note:- Mileages along highway are approximate ; \ i a