Ollie
The spiriferoid fauna is higher Byatt ehiea lye Its
correlation would be with the Rundle. or younger-limestones” of more
southern sections, although the two faunes fees different facies,
and have little in common. —

Renn Sy Nea or Permian °

‘The rocks. assigned to this age consist iof lack chert beds
that. weather grey or brow. They overlie the "iis si ssippian! Nv séries,
in the vicinity of miles. 91 and 92, The contact is abrupt, but no Hs
structural discordance is Niet Rae relationship being disconformable.

The upper contact of the chert beds has not been seene
Triassic strata oecur to the west, at mile 93, toward which the chert
_-beds’dip. The chert beds form a pr oninent Hill (to.the north of the ’
wees pene oe and appear to be 200 to;300 IK ‘thick. aoe

So far.as seen, this formation consists entirely ce black, |
hackly chert. Jointing has reduced the rock to angular masses that
break out and form rough talus slopes. No fossils have been found: in
the cherts, nor do they appear likely to contain evidences of organic
remains o Lithologically the chert beds resemble the upper beds of the
Rocky Mountain’ quartzite ‘of the Jasper. Park area, which Warren dated
as Pennsylvanian by analogy with the fossiliferous: beds of Banff, Warren
suggests an overlap at Jasper where the lower beds as represented at
Banff are missing. The section on the Alaska Highway appears to represent
a further: overlap, as only the upper chert-beds are present. Cherty beds
occur in the’ Pennsylvanian beds of the upper Pine River Valley of the
Peace River area, but until more detailed studies of that section have
been -made. no. ‘definite, ‘correlation, can be. attempted. Chert beds 150. feet
thick, overlain conforma bly by fossiliferous Permian. ‘sandstone, are balay
exposed on Beaver ee pe southeastern Yukon and sage be correlative

Somaee E.De:' Geol. Surv., Canada, Paper 44-16 (1944).

with the chert formation on the Highway section.

_ Black: Shamen: calcareous argillites,: and: Soijeneens sandstones
ueocy in road-cuts and nearby hills between miles 94 and 101%.’ Cher’
beds and hard sandstones: are present in places, but-all the rocks are
high in lime, except in outcrops where the lime is largely dissolved out,
leaving grey or light-coloured, saccharoidal sandstone. The formation |
is sharply folded and drift and forest cover obscure the séction.
Minimum thicknesses are indicated, however, in the anticlinal ‘hills,
which contain fossils of about the same age from-botto to-top. One Hof
these rises 1,600:feet above its base at mile 98. The broad section (ovis
outcrops of this. formation suggests that the total eth may be as
much as 3,000 feet, eae

The age of these rocks is based upon a number of fossil
collections made in the hills north of miles 93-94 and 97-98. At
the former locality, and 650 feet aveve the Highwey, Dielasmas
were found in brown, calcareous sandstone. They suggest that
Mississippian beds form the base of the hill, which is ‘clearly faulted
and folded... At the top of the hill the Nathorstites fauna is represented
by Nathorstites meconnelli Whiteaves, N. meconnelli var. lenticularis
Whiteaves, and Dielasma liardense Whiteaves. F.H.McLearn ©