



Rey, as ‘BOUNDARY saiertionrt 

cleat 
ROSS 
the base it consists of sandy clays, but as we ascend to the higher ie 3 
we find the arenaceous matter increasing, so: that at some places th 
whole passes into a sandstone. It is not separated by any stror 
defined line of demarcation from the formation below, the res fi 
the fine clays of the latter to the more sandy material above, 
very gradual.”** Nor does the transition appear to be marked tv any 
great change in life, as indeed this division might almost as well be 
considered the closing epoch of the last, but for the lithological brea 1k, 
and the persistency of these upper sandstones over great areas. In t h Te’ | 
Black Hills region, and along the base of the mountains, they are well 
developed, with similar lithological character. er x 
360. Though this division must border the eastern ie of the Lignite 8 4 
x Tertiary, its rocks are not there exposed in the vicinity of the forty-— B 
=. ninth parallel. The first beds distinctly referable to it, were met with — rs. 
-.- in the Bad Lands south of Wood Mountain, and in the general section oa 
there designated by the letter y. Their outcrop is again seen on the. ("4 
White Mud River, and they must follow continuously along the southern ; a 
base of the Tertiary plateau, though seldom exposed. They were not 
seen at the junction of the Cretaceous and Tertiary, east of Milk River, 
but their position was marked by sand-hills. On the flanks of the Buttes, — a 
a they are again brought to the surface, and consist of rather hard sand- — ri 








>. 





























stone, with some softer and more argillaceous beds near the base. > 
. Judging from the few localities where they were observed, the extent of a : 
* their induration appears to increase westward, being greater in the ‘ 
White Mud River sections than the Bad Lands, and still more pronounced a. s 
near the Buttes. 
f 361. Prof. Hind notes the occurrence of these rocks in two places: ae a 
o only, both situated on the northern edge of the Wood Mountain ie 
“@ plateau. The first is at the junction of the Eyebrow Hill stream, on the | 
a Qu’ Appelle, where ferruginous clays, and hard greenish sandstones, with — 
some veins of selenite, appear. The second locality is the Elbow of the hs 
South Saskatchewan,} where the rocks consist of greenish, and yellowish- _ 
fi: grey sandstones, with some clays, and large imbedded concretions. The — 
fossils obtained from these were submitted to Prof. Meek, and by him q 
stated to be characteristic of group 5; the following species being repre- a 
sented: Scaphites Conradi, Nautilus Deckyi, Avicula linguiformis, Avicula ; Yin 
P * Geological Report Yellowstone and Missouri Expedition, p. 29, a 
. a 
-< firghy is probably also the locality described by Prof. Bell. Report Progress Geol. Sury. Canada, p. ad. 
‘ 73 74 

