82 GEOLOGY. 
, Inches. 
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| Re a ee ee Oe ee ee ee eee ee ee Pissed ete cield ww 3 ssm Soe at ezene 9 
11. Bituminous shale ---. .-...... er State Die ele eo eye bie Seine een: 8 : Petes wa SIG wig 18 
1 Geek ei i oii tito bie Ko Wee bie we ee 
13. Clays -e see cece ee cree eee teen ee 
14. Bituminous shale -.---- +--+ +++. 
$5; Coal bGesdGiweei Gs Cupane « 
162 Bituminous shale -«'sise cess Hed ie Sopa wie 0 eye 
Rigen on TR eng age D nape Sie: 3 
All the fissures in the coal and clays are studded with tufts of fibrous gypsum. The sandstone 
below the coal is white and coarse, but hard; and is similar to the sandstone found beneath the 
fire clay of the first coal seam in the Alleghany coal field. 
The marls, red and green, which lie below this are precisely like many of those found near 
the base of the series. As is the case with all the rocks of this region, they contain gypsum 
and salts which effloresce on exposed surfaces. The sandstone below the shales is pure white, 
very soft, and looks like white sugar. It contains a large quantity of lime and is curiously 
eroded by the action of the weather, as shown in the accompanying sketch. 
Fig. 20.—ERODED SANDSTONE, NEAR THE MOQUI VILLAGES, (CAMP 92.) 
Fossil plants—The coal seam of Camp 92 varies greatly in thickness even within the limits 
of the section there exposed. Five miles north I found it occupying the same position, but 
thin ; and in several localities further east, where the exposures included its place in the series, 
it was not to be found. Wherever it appears it would probably form an important guide in the 
determination of geological structure, as it contains numbers of fossil plants very beautifully 
preserved and of peculiar -and unmistakable character. I deeply regret that the time I had 
for the examination of this locality was so short, and the means at command for excavating 
