MrREAT— wallabies' HOLES IN AUSTRALIA. 



63 

















Nummulma 



N. laevigata. 













Nummulina 





N. scabra. 



N. scabra. 





scabra. 













Nummulina 



N. variolaria. 





N. variolaria. 





variolaria. 











Miliola (Trilo- 







Miliola (Quin- 





culina). 







queloculina). 







Guttuliiia. 





Guttulina. 











Rotalia obscura 











(and others). 



Lignite. 









Lignite. 



Pyrites. 



Pyrites. 







Pyrites. 



Should one wish to take in hand the examination of a series of the 

 tertiary strata of any part of the Isle of Wight basin, in the manner 

 above suggested, well assorted samples, collected and labelled with 

 care, can be readily obtained of Henry Keeping, of Freshwater, who 

 is an intelligent and trustworthy collector, and whose charges are 

 moderate. 



ON THE OCCIJEEENCE OF A PECIJLIAE SUBSTANCE 

 IN THE LIMESTONE OF SOUTH AUSTRALIA. 



By W. Mueeat, Esq., C.E. 



Taking a section across the Murray River Valley, in South Austra- 

 lia, for a distance of about forty miles from west to east, we have (as 

 shown in the accompanying diagram) two parallel ranges, and on the 



Fig. 1. 



outer flank of the western range there are at some places micaceous 

 strata (a), having a steep inclination, resting against the contorted 

 strata of the range, sections of which are seen in gaps and gullies, 

 with steep sides, in some instances 800 to 1000 feet deep. These 



