35

Peace River Foothills now comprising the tentative lithological units of
‘Dark siltstones’, ‘Grey beds’, and Pardonet beds. :

Triassic formations, lithological units, and faunal zones are recorded in

the following table:

TABLE OF TRIASSIC FORMATIONS AND LITHOLOGICAL UNITS

Formation

Lithology

Faunal zones

Pardonet beds
250-2,000-+

Upper

‘Grey beds’
2,500 +

(Thickness in feet)

Dark calcareous silt-
stones and shales;
some dark lime-
stone

Grey, massive, thick-
bedded, calcareous
sandstone; grey
limestone

‘Dark siltstones’
75-430-+

Triassic

Thin-bedded cal-
careous siltstones;
dark limestone

Monotis subcircularis
Himavatites

Cyrtopleurites cf. bicrenatus
‘Styrites’ treneanus
Tropites

Stikinoceras

Lima? poyana
Mahaffy cliffs faunal zone

Nathorstites

Middle

‘Flagstones’
235-380 +

Liard

Thin-bedded silt-
stones, flagstones,
some massive
grey sandstone
and limestone

——|Toad
800-1,800

Dark, calcareous
siltstone, shales,
and dark lime-
stone

Beyrichites-Gymnotoceras

Wasatchites

Lower

Grayling
600-1,000

Dark shale

ef. Claraia stachet

a

GRAYLING FORMATION

Definition

The Grayling formation, named and described'by E. D. Kindle in 1944,

consists of marine, dark grey shale and some layers of sandstone.

It lies

conformably below the Toad formation and probably disconformably above
the highest Paleozoic rocks in the region.

Liard River Valley

In Liard River Valley, Kindle (1944) describes 600 to 1,000 feet of
soft, laminated, friable, grey shale, with in places layers of hard, ripple-

marked sandstone,
1 foot.

The formation is expose
of Grayling River, and this is the type locality. é
Liard, east and west of the mouth of Grayling River (See Figure 4).

1 inch to 10 feet thick, but commonly not exceeding
d in cliffs, 300 feet high, on the lower part

It is also exposed on the
It is

probably present in the Tetsa and more southern valleys, but has not yet

been recognized there.