BY A. B. WALK0M. 181 



in the Clarence Scries, as the writer had an opportunity of <>li 

 serving- on a recent, very short visit to the Clarence River (lis 

 trict. The sandstones, which form very hold outcrops in the 

 Glenreagh district, certainly represent a very marked horizon in 

 the Series, reminding one of the sandstones of the Hawkesbury 

 Series physiographically as well as lithologically, and, having 

 seen them, it is easy to understand the former tendency to corre- 

 late them with the Hawkesbury sandstones: there is, however, 

 no sound evidence for such correlation, and it is practically 

 certain that they represent a much higher horizon than the 

 Hawkesbury sandstones. The massive sandstones at Maclean 

 also form a noticeable feature, and may represent the same 

 horizon as those at Glenreagh, My visit was too short to do any 

 Held work, but I was particularly struck by these two coarse, 

 massive sandstones. 



There is not much doubt that the Clarence Series is of Jurassic 

 age: the upper part certainly is, but some doubt has been ex- 

 pressed regarding the lower portion. Mr. B. Dunstan, Chief 

 Government Geologist of Queensland, in discussing this point 

 with me, has suggested the possibility of the lower portion of 

 the Clarence Series being the equivalent of the Ipswich Series in 

 Queensland, and therefore of Upper Triassic Age. So far, our 

 knowledge of the palaeontology docs not confirm this suggestion. 

 Carne has stated very definitely that Tceniopteris Daintreei ( = T. 

 spatulata) occurs in the basal part of the Series.* This species 

 has not yet been found in rocks older than Jurassic in Australia, 

 and so, if Carne's observation be correct, little hesitation is fell 

 in placing the whole of the Clarence Series in the Jurassic. 



In discussing the correlation of the Lower Mesozoic rocks in 

 Australia,! 1 could only find record of four species of fossil plants 

 from the Clarence Series, viz.: — Cladpphlebis australis, Thinn- 

 feldia odontoptei'oides, Sphenopteris sp., and Tceniopteris spatulata 

 ( = T. Daintreei). In addition, TcBniopteris Tenison-Woodsi had 

 been seen among specimens collected by Mr. I!. Dunstan. .Mr. 



( 'ai ne, op. cit., p. 34. 

 I Proc. Linn, Sue. N. S. Wales, l'.Hs. Vol. xliii., pp. 82-86. 



