84 



twi-'S jtiul bunches of the white cedar which is met with not uiifre- 

 queutly. Another mode of preservation of these fossils at Green's Cieek 

 is throuoh the infiltration of a siliceous solution, so that shells are 

 as thoroughly silicified in this deposit as they are in the Black River 

 formation at Paquette's Rapids, muriatic acid not affecting the shell in 

 the least. Others are preserved with but little change from the character 

 in which they were entombed, whilst others appear as if they were live 

 shells with the epidei-mis on and nicely preserved. 



Of the other fossils which characterize this formation a gi-eat deal 

 mioht be said, but passing over these important discoveries I will 

 mention that during the past season a large number oi foraminifora 

 were collected. Dr. G. M. Dawson, whose extensive researches in 

 Post- Tertiary Geology have enabled him to give valuable information 

 regarding the best mode of obtaining these very minute organisms from 

 the clays, and of working out their microscopic character, ha? very 

 kindly given the writer such hints as have provetl of utmost value in 

 this connection, so that by a series of percolations of a solution of clay 

 and water, on sheets of blotting-paper a largs number of specimens was 

 obtained. The largest of these, and a common species in nearly all the 

 collections from the Gulf ?nd elsewhere, is Folijstomella crispa, L., which 

 also occurs in our Ottawa deposits. Besides these forms there remains a 

 great deal of material ready to be worked up and awaiting identification. 

 It has already been hinted that the " Leda clay " formation, laid 

 down beneath the level of an ocean or sea which extended in this region 

 as far west as the Bonnechere River {loc. cit.), was followed by a period 

 of elevation. Whilst these clays were thus being deposited along the 

 bottom of th^ sea, i.e., at some distance from the shores, the sands and 

 gravels which usually mark the littoral deposits of an ocean were 

 being deposited in this vicinity in regular order. They are ai-enaceous 

 deposits in which distinct lines of stratification occur overlying the 

 clays in numerous localities, but their thickness varies considerably 

 in different places. This uprising of the continent which 

 exposed to view the former depths of the ocean, once begun 

 has continued on, and there is no index that points out whether this 

 elevation has, up to the present day, ceased. The sands and clays 

 which were laid along the shores and bottom of the old Ottawa Sea, up 



