CHURCHILL AND NELSON RIVERS. 25 C 



pebbles at the bottom, overlaid by ninety feet of sand and gravel. On FirstLimestone 



the same side of the river, at the foot of the rapid itself, 100 feet of the pi 



hard drift clay, which here shows uneven joints with rusty surfaces, 



rest upon twenty feet of buff-coloured fossiliferous dolomite in nearly fogtffiferoua 



horizontal beds. It is shaly at the base, but at the top some of the dolomite. 



beds are two feet thick. These hold flinty and white chalky nodules. 



A cliff, twenty feet high, of greyish-buff dolomite, mottled with yellow, 



runs along the edge of the rapid on the other side of the river. Among 



the fossils observed here was an Orthoceras two and a-half feet long and a ... 



° second Lime- 



six inches in diameter. On the south-east side, just below the Second stone Rapid. 

 Limestone Rapid, nine miles above the first, a cliff, twelve feet high, 

 at the edge of the river, is formed of horizontal beds of crumbling buff 

 and greyish dolomite. At about a mile below this locality these beds 

 were observed to be slightly undulating. At the Third Limestone Third Lime . 

 Eapid the rock is exposed in horizontal beds at the foot of the clay stone Rapid- 

 bank along the south-east side of the river, and consists of bluish-grey, 

 drab and buff, somewhat arenaceous dolomite. Near the foot of this , 



7 Arenaceous 



rapid a considerable stream, which I took to be the Limestone River, dolomite. 

 enters on the opposite side. 



For the next eleven miles the river is very swift, and then a rapid, 

 two miles wide and full of knobs and little ridges of gneiss, begins, and 

 continues for five miles, or to the Twelve-feet Chute already men- 

 tioned. This might be appropriately termed the Broad Rapid. In Broad Rapid, 

 going from the lowest of these rapids to the other, the banks on 

 both sides diminish from a height of about one hundred feet at Diminution in 



9 height of banks 



the former to about fifty or sixty at the latter ; yet the surface of over river-bed. 



the ground probably slopes in the same direction as the river, the g lope f r j yer . 



descent in the latter being apparently greater than would be accounted bed- 



for by the difference in the altitude of the banks, supposing the tops 



of the latter to be horizontal. On the north-west side, the clay bank 



is quite continuous and almost bare all the way to within a mile of 



the Twelve-feet Chute, a distance of over sixteen miles by the river. 



Near the Third Limestone Rapid the bank was observed to be more or 



less distinctly stratified throughout its whole height. On the opposite 



side, the upper part, and sometimes its whole depth, consists of 



gravel and sand. 



Along the above interval between the rapids, ledges of the dolomite 

 crop out from beneath the banks here and there on both sides. The 

 last exposure is on the south-east side at the bottom of the Broad (five 

 miles) Rapid. Here it is finely arenaceous, of a mottled light bluish- Arenaceous 

 grey color, and holds some of the same fossils as those found further 

 down the river. The fossils collected at the three Limestone Rapids 



