dose

The peds ‘are crushed, folded, and faulted: On the west they lie,close.
to the, eastern ‘side of a pronounced anticline. in adjoining Middlo.
Triassic. ‘strata. The variability of strike and dip of the, two groups.
suggests & faulted contact ot the front of the anticline, which is.
closely folded and faulted on its western limb. The absence of Upper ..
Triossic and Jurassic strata would also lend support to the occurrence
of such a fault were it not possible that ate of these og08 may never
have been deposited in this region. | seen:

Farther east, near mile 17, shunping sandstone ‘occurs din a
road-cut . - ; Best

‘One poorly preserved Cardium sp. was found near mile 86 in
dork grey sandstone. lLignitic beds measure as much as 4 feot in

thickness, but no true coal was found. The proximity.of these bedg to.

the Middle Triassic rocks on the west suggests a low position for them
in the Cretaceous section. Their relationships on the ¢ast are unknown,
but they appear to assume the regular regional dip.toward.the east, and .
the br oad: valley of Mill -Croek is: suggestive of erosion of soft beds
such ®8 shales of the’ Fort St. John group. The assumed age is lower
Lower’: Eee ioe ox about the Loget Matrtag he of the’ pug group of the
Peace: River ‘area .
aah ot $s flake . , pace 5

Fort St. jenehoude The wide. plains area extending 57 wglivey
westward.:fron Fort Nelson is underlain ‘by. sort, sandy, dark brown or
black shale. Because of its. softness it is etary exposed er the
Highway . i phigh

At mile 8 (R. Melville Smith Goristruntion Camp) a small eeecatn Gees

flows: southward from a hill that rises 200 to 300 feet above the plain.

The hill consists of black, sandy shale, with small. concretions in some »

of the beds. =A bore-hole, drilled for! water, had penetrated to a depth
of 208 feet in this shale. ~The formation~heré” ds*nearly horizontal. “At
mile 27, black shale occurs in oa road-cut, and Sone ae mile 39 a largo
shat ‘outcrop occurs: in Kledo Rivers — ae E

West of mile 50 the hae enters the Foothills, Beier con~
sisting ‘of horizontal dark shale. About 200 feet of shale is: exposed

between mile 50 and mile 51 where it is overlain by sandstone. The shale .

is nodular, commonly rusty weathering, with sheared vertical ‘surfaces, .

striking south 50 degrees west. At the forks of Tetsa and Muskwa: Rivers;

south of mile 52, exposures of dark shale show in the banks. Along the
old road, south of mile 54, a 500-foot section is in part exposed. This
consists of several ledges of thin-bedded, grey-blue sandstone weathering
buff, with covered intervals above and below strongly suggestive.of shale

interbeds, At the top of the section sandstone occurs interbedded with.

shale. Worm burrows are numerous on some slabs, and again near mile 53.
and mile 54 on the new location of the road Posidonomya nahwisi var. --::
moberliensis and P. nahwisi var. goodrichensis were found. Just below
these fossiliferous béds poorly preserved plant remains and & 3-inch
coal seam occur in the sandstone. McLearn correlates this part of the
section with the Goodrich formation of Pine River Valley. . At: Commotion
Creek this is classified:as the second highest member of the Fort St.
John group. Along the Highwny south of Fort Nelson the shale is ap- ©
perently continuous with’ the Buckinghorse formation of the same group
(Hage, 1944).

To the west, the sandstone beds dip downward to a syncline,
beyond which they rise gently into Teepee Mountain. This somewhat
round-topped hill is situated between miles 60 and 61 on the new’road
and mile 61 on the old location. The strike of the strata varies from
north to northwest, the dip being easterly at from 5s to 10 degrees.
Pepper and salt sandstone outcrops along the road on the south side of
the mountain, soft sandstone and shale beds continuing upward. About.

SSS Gc