Oil the Marine Rooks underlying Warrn.amhool. 97 



Marine marls generally represent old oyster banks. Either 

 origin is possible for this stratum, as there are no organic 

 remains to be identified in the sample from the bore. 



Beds No. 12 and 1G. Beds of Green Sand, full of 

 Fossils. 



These deposits are of a deeper water type than those just 

 considered, the particles being coated with glauconite. This 

 deposit is generally supposed to indicate a depth of from 100 

 to 700 fathoms ; on the other hand, a species of green-sand 

 is found opposite to the mouths of streams which traverse 

 volcanic country, such as the Hopkins does. In this latter 

 case, the green colour is due to a part of the pyroxene having 

 been changed into chlorite. Such a deposit has been 

 described by Professor Hutton as occurrmg at Waihao, in 

 New Zealand. 



I sent the fossiliferous sand to Dr. MacGillivray, of 

 Sandhurst, for identification, and his report on it is, that 

 there are no undoubted polyzoa in it, although one or two 

 small masses in the parcel sent might be such, but none of 

 the remains were sufiiciently distinct to enable him to 

 identify them. There were amongst the broken fossils some 

 small calcareous tubes, which he did not understand the 

 nature of.* 



Bed No. 13. Blue Gravel, 22 ft. Thick. 



No specimen of this was preserved, but from the descrip- 

 tion given, I think it may have been derived from slate rock. 

 As no such rock outcrops, as ftir as I can learn, less than 

 thirty miles away, this deposit must represent a river-borne 

 material, and it must have reached its place of deposit at a 

 time when the coast line was near by, as it would require a 

 current of some swiftness to move it. 



Beds 11 and 14. Blue Clays. 



This material was probably derived from the same slate 

 rocks that yielded the blue gravel, being the finer washings 

 produced by the grinding up of the pebbles. 



* Dr. Dendy, who has seen these fossils, thinks that he can identify them 

 with those of an early Tertiary deposit found in the Isle of Wight. 



H 



