DEER ISLAND, LAKE WINNIPEG. 



13 



dominate over the shaly portions. Its thickness is six 

 feet. The character of these formations (1 and 2) is very 

 variable ; the green argillaceous portion sometimes pre- 

 dominates, and occasionally the sandstone. 



No. 3. Ten feet of sandstone with green bands of a 

 soft argillaceous rock, from one quarter to four inches in 

 thickness. The sandstone often white, but generally red. 

 A persistent green band, a few inches thick, filled with 



Exposure on Deer Island, near Grindstone Point. 



obscure forms resembling fucoids, is very characteristic. 

 The red-coloured sandstone is often soft and friable, the 

 white frequently embodied in the red. Both red and 

 white contain obscure organic forms. The green patches 

 which are found throughout the sandstone contain im- 

 pressions of fucoids ; an Orihoceratite was found in the 

 sandstone. In some parts of the exposure on Deer Island 

 the sandstone layers are much harder, although partaking 

 of the characters already described. When thus hard, 



