of Missouri developments:

Argillite of similor character occurs in tilted position
some 12 miles down Liard River at the head of the canyon at Devils
Portage.

West along the Highway to mile 221, 9 dark argillite hill
rises northeast of vate road. The rock is hard and weathers rusty.

A rounded argillite hill occupies the angle between Tiara
River and the creek from Fishing Lakes.

Black, rusty weathoring shale outcrops in the road just east
of Smith River, and similar shale is down-faulted against massive
RENAE at the falls about 13 miles up the river.

“At mile 261 peaeniie sandstone occurs ne the felt sae
of Liard River. Fractured and sheared shale occurs near te 264 and
mile 268. Shale also outcrops ae mile 2774. :

West and north of a series of limestone ridges, shales occur
in road-cuts at-miles 305, 506, and 309.. Sandstone beds occur in the
last, outcrop. “At, mile 316, soft banded shale.occurs in a road-cut and
black ee shale cours from mile 320 to caealiy

Hest of Hylana’ Hivon: nd: ; rock is erpored! along the Highway
below Lower Post. McConnell réports * “three outcrops of: shale, RAS Hoe
and quartzite in Liard River between these points. al

About a mile up Dease River, dark shale occurs in, the. onan
bank, and” farther up, Two Mile Rapids are formed. over black argillite see
resting on black ‘chert. ees acer mee :

Black shale outcrops. in the canyon of the Liard just south ‘of
the British Columbia boundary, and limestone and soft weathered shale
Ca eOnee, for more. than halt 8 mile along the Oe nae

‘No fossils were found. in the shales and associated beds west
of as Liard bridge and their age is, therefore, based upon lithology
and their relationship to the older limestone series. West of Hyland
River, hard sandstone beds and limestones appear-in-the shale series,
and the Siluro-Devonian limestones do not appear. Dawson found Ordovician
graptolites in shales about 12 miles southwest of Lower Post, suggesting
the possibility that the western shales may underlie the Siluro-Devonian
series, The shales along tho lower Dease and upper Liard Rivers, however,
do not suggest graptolite shales to the writer, and their rather close
resemblance to the more.casterly outcrops makes it seem desirable to
include them tentatively with the Devono-Mississippian series.

‘The thickness of this series is not know, but it is evidently
some 2,000:feet thick at the Liard crossing. Its widespread occurrence
Suggests that it may be much thicker. As pointed qut, Upper Devonian
shales make up the base of the series, and Mississippian (Kinderhook)
argillites, sandstones, and limestones its higher member Se

Mississippian and (?) Later

Mississippian and, possibly, later Palaeozoic shaly sandstones,
black shales, and grey limestones, 600 feet or more in thickness, occupy
a belt crossing Tetsa River and the Alaska Highway between miles 90 and
94. The eastern half of the section has prevailing vertical dips and the
contact of the series is clearly in faulted relation with Triassic beds