364 CONTRIBUTIONS TO THE GEOLOGY OF 



ginous sandstone, or of ferruginous sand and clay ; the whole covered 

 with a bed of diluvium. 



Near the end of this line a blackish, clayey substance rises into 

 view, from the base of the cliff, underlying the blue clay above 

 mentioned. This gradually becomes more exposed upon the bank, 

 until it attains the height of four feet, after which it slowly sinks, and 

 is again lost. The marl now makes its appearance, consisting of a 

 blue clay, with little sand, and multitudes of shells. This reaches 

 along the bank for about four hundred yards, when it is succeeded by 

 a shell rock, in which the shelly fragments are almost completely re- 

 placed by brown oxide of iron. This continues to near the end of the 

 bank, which now subsides into the flat, extending from Musqueto 

 Point to Windmill Point, on the bay shore. 



Locality one and a half Miles east of Lancaster Court House — Mr Benjamin Walker'' s. 



This exposure, which is in a ravine on the ridge of the neck, pre- 

 sents the following strata : 



1. A bed of blue marl, containing great numbers of shells, many of 

 which are of the larger species. The depth of this stratum is not 

 known. 



2. A similar stratum of a rather lighter colour, and containing chiefly 

 the small shells. Three feet thick. 



3. A layer of ferruginous matter, abounding in the casts and im- 

 pressions of shells. These casts are usually found in the interior of 

 spheroidal nodules or geodes of oxide of iron, and consist of this oxide, 

 replacing the shelly matter, and covered with a beautiful shining co- 

 vering of the carbonate or velvet iron ore. This bed is four feet 

 thick, and reaches to the surface. 



Locality four Miles south west from Northumberland Court House — Mr George Booth's. 



This exposure is in a hollow, about twenty-five feet below the level 

 of the ridge. The strata are: 



1. A layer of greenish blue marl, containing a notable amount of 

 green sand, in spots and blotches, and sometimes almost unmixed 

 with other materials. This stratum has been penetrated five or six 

 feet, and is supposed to extend to a much greater depth. The shells 



