CARBONIFEROUS AND PE RM0-0ARBONIFEROU8 ROCKS, N.S.VV. 305 



tillites of Victoria and the Hallett's Cove Beds of South 

 Australia are certainly to be correlated witli the Wynyard 

 beds of Tasmania. It is probable that the Wynyard, the 

 Bacchus Marsh and the Hallett's Cove tillites are on the 

 same horizon as the tillites at the top of the Kuttung 

 series, while there is quite a possibility that the Irwin 

 tillites belong not so much to the topmost tillite of the 

 Kuttung series, as to a somewhat newer glacial horizon 

 near to the chief zone of Enrydesma cordatum, at Allandale 

 and Harper's Hill in the Maitland District. 



Enrydesma cordatum is of course associated with the 

 tillite and boulder beds of India at the Salt Range, and 

 Eurydesma globosum is associated with the Dwyka series 

 of South Africa in South West Africa. But Eurydesma is 

 a Pacific genus, and in order to refer its age to some reliable 

 Northern Hemisphere standard it is necessary to examine 

 a place like the Salt Range of India, where sediments of 

 the Tethys actually make contact with the Eurydesma 

 beds and their associated tillite. In Australia the "Permo- 

 Oarboniferous" sediments of the Tethys are well developed 

 along the old shore line shown on the map on Plate XXX. 

 But unfortunately no spot has yet been discovered in Aus- 

 tralia where the Pacific type of Permo-Oarboniferous fauna 

 actually comes in direct contact with the Tethyan type. 

 Nevertheless, as at the Irwin and Gascoyne River areas in 

 West Australia, there is an immense development of the 

 tillites and an extensive Tethyan marine fauna associated 

 with them, it is very important to consider this critical 

 area in some detail. 



5. Irwin River and Gascoyne River areas West Australia # 

 — With the aid of the reports of the Geological Survey of 

 West Australia and notes kindly supplied me by Professor 

 W. G. Woolnough, d.Sc, the following descending section 



T— December 3, 1919. 



