322 C. A. SUSSMILCH AND T. W. E DAVID 



6. India. — This and other extra-Australian evidence will 

 be reviewed very briefly. The main lines of correlation 

 are suggested in Plates XXIX and XXX. The glacial beds 

 of the Salt Range so closely associated with Eurydesma 

 and Oonularia can probably be correlated with the Eury- 

 desma glacial horizon about halfway down in the Lower 

 Marine Series of New South Wales. This would make its 

 age about Uralian (Upper Carboniferous), as already main- 

 tained by Vredenburg and G. de P. Cotter. 1 The entire 

 absence of forms like Fusulina, Schwagerina, Archimedes 

 etc. from the Australian Permo-Carboniferous rocks renders 

 their correlation with strata in the Northern Hemisphere 

 more difficult. It is important that Lyttonia has been 

 recorded by Diener from the Fenestella shales with Proto- 

 retepora ampla of the upper division of the Po Series in 

 the Himalayas. Lyttonia is specially characteristic of 

 the middle Productus limestone of the Salt Range, where 

 its age is considered to belong to Rothliegende. On the 

 other hand the Lyttoniidae have been found as low down as 

 the Uralian in Russia, but the form described from there 

 by Tschernzschew is ascribed to the genus Keyserlingina 

 rather than Lyttonia. It may be provisionally concluded 

 that the Protoretepora ampla shales of the Po Series in 

 the Himalayas are approximately of Rothliegende age. 



Vredenburg considers the Lower Productus limestone of 

 the Salt Range as Artinsk and the Talchir boulder bed also 

 as Artinsk. The " Speckled Sandstone" with its boulder 

 beds he considers to be Upper Uralian. He thus recognises 

 two distinct geological horizons for the late Palaeozoic 

 glacial beds of India, viz., Upper Uralian and Artinsk, 

 respectively. 



Cotter (op. cit. p. 33) in his table of Gondwanaland 

 deposits does not appear to recognise two glacial horizons 



1 Geology of India, Table of Geol. For. in the Indian Empire, and Rec. 

 Geol. Sur. Ind. Vol. xlviii, pt. 1, 1917, pp. 23-33. 



