of

fine grey shales, medium-grained sandstones, and arkosic con-
glomerates, a great deal of the detrital material having been
derived from the Yakoun volcanics. These rocks are best
exposed in Robertson creek, but a fair idea of their character
may be obtained from the following columnar section measured
in a small creek northeast of Camp Robertson:

Feet Inches

Hinecorey sandstone sseudtad seas Sa, © vate bo. SH ik ;
C OAtEe oreuicdNGstOnen usa asi i es. We ee iA is 66
Missive. Mae Grey SADC SOM oi 55-3 sso: sueehauene gia ave 20
Mostly concealed, probably coarse light grey sandstone. . 60
Fine; lamimated, crushed shale... 02 Soros Poe oe eee 0 1
Very fine; drab; jointed sandstone: 23.3.5 606d ee daes bos 8
HUATMIN ADEM EK, SHALE) lo. S.k CAGES cccldu pid OS OTE S eseie ces 0 1
Coarse pebbly sandstoneds,. toi avid sie ccd ws eee «ite 20
IML OCMteor adel SANGSLOMG Ge ci. vss ste wet care wee Sele ce 0 1
Baninated grey sandstone: +7. SP oS 5 OSE 2 3
Fine; drab samdstones. i 2 ok Re ST eee Ee 10
Coatsetienb) y.eandstone: oc. tyis. bao Cate ere ee ne 4
NEARY SANG SEOUE Sieh cele as eG) sos ouduata yeas cna uieeaeat a i
PAMimeveds Guey SAGStONG:y. go. : Gk cs aa ace seas oe Z
Wats Prey GANGGONG ek SIM soe on. ST eh ne 4
Bightisrey sandstone sl. Sai. Gas. SES aE 4
Dark grey sandstones sc co sag. are ceo Riga Syke, Svs Bets 8
LENCO RCT es, ACEI G £055 eae ee US PRD UIE Se emer ieee TIES. SF 3
Wark: Grey GanG@utaner aus vw ee Gand 3 6 ec Oe was bet 6 0
Fine-grained, drab sandstone, partly concealed.......... 45
Finer-grained, drab sandstone: .. 2.2.2.2... 00.05 cece es 12
Medium-grained, grey sandstone............00cccceeee 50

PMO Os cs caencits 5 orale -aie'y Ke OM eha A eee 302 5

The upper member is much more homogeneous, and con-
sists of very massive fine, even-grained, bluish and greenish,
quartzose, grey sandstone, often beautifully laminated, and
occasionally showing signs of irregular current bedding. In-
terbeds of thin bedded, flaggy sandstone occur. Throughout
the area in which the thick-bedded sandstone is found, the dips
are flat or gentle. The recognition of this massive band of
sandstone is important for prospectors, for the known coal
horizon is found about 200 feet below its base.

RI Nr ee