GENEEAL CHARACTER OF FORMATIONS. 



341 



Creek and Teton Eiver, forming a high ridge from which 

 tributaries of the Sheyenne and Teton take their rise. 

 The little streams flowing into the Sheyenne have a north- 

 westerly course, while those emptying into the Teton take 

 a south-easterly direction. We thus find that this bed 

 underlies an area of about 200 miles in length and fifty 

 miles in breadth, or about 10,000 square miles. 



The general character of Formation No. 5 is a yellow 

 arenaceous and argillaceous grit, containing much ferru- 

 ginous matter, and in localities a profusion of molluscous 

 fossils. It forms a much more fertile soil, more hearty and 

 luxuriant vegetation, sustains a finer growth of timber than 

 Formation No. 4, and abounds in springs of good water. 



Like No. 4, this bed yields a great abundance of quite 

 perfect and well-preserved organic remains. Many of 

 the species approximate so closely to Tertiary forms, that 

 did we not find them everywhere associated with Ammo- 

 nites, Scaphites and other genera which are not known to 

 have existed later than the Cretaceous epoch, we should 

 at once pronounce the formation in which they occur, 

 Tertiary, The whole thickness of this bed is estimated 

 at 100 to 150 feet] 



The rocks at La Eoche Percee near the boundary line 

 (long. 103° 59'), with their associated coal beds^described 

 by Dr. Hector, are probably of the age of No. 5, as well 

 as those seen by the same gentleman on the west side of 

 the outer range of hills close to the main chain of the 

 Eocky Mountains. 



An exposure of this formation occurs on the Eyebrow 

 Hill stream, where it joins the Qu'appelle Valley. A fer- 

 ruginous clay in yellow and red layers reposes on a hard 

 greenish-coloured sandstone, seamed with veins of selenite, 

 and containing huge concretions. No fossils were found 

 in the rock. 



z 3 



