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



strong angular unconformity between these two horizons 

 at the above locality. 1 



The Eurydesma cordatum horizon therefore of Pokolbin 

 (identical with that of Allandale and Harpur's Hill, in the 

 lower Marine Series) does not belong to the Kuttung series, 

 but is distinctly newer. 



The thickness of the strata which intervene between the 

 top tillite of the Kuttung and the Allandale Eurydesma 

 beds is approximately 2500 feet. While hereafter it may 

 be found desirable to extend the Kuttung series upwards 

 to embrace part of these beds, it is considered best for the 

 present to consider them to be Uralian, i.e., Upper Car- 

 boniferous (see Plates XXIX and XXX). As regards the 

 important question of the age of the strata from the Eury- 

 desma beds upwards to the top of the Newcastle series it 

 is suggested that (a) the whole of this group may be termed 

 Permo-Oarboniferous or even Permian. The horizon of 

 Protoretepora ampla and Strophalosia Clarkei, which at 

 Allandale, immediately and conformably overlie the Eury- 

 desma beds is very suggestive of a Permian age, and as 

 shown on Plate XXX at Kashmir, the Protoretepora ampla 

 shales of the Zewan beds overlie Glossopteris beds con- 

 taining remains of the Permian labyrinthodont Archego- 

 saurus; or (b) as suggested by Professor J. W. Gregory 

 this group up to the top of the Upper Marine Series may 

 be considered Uralian (Upper Carboniferous), while the 

 remainder from the base of the Tomago Coal-measures 

 up to the top of the Newcastle series may be considered 

 Permian. The slight unconformity between the base of 

 the Tomago Coal-measures and the top of the Upper 

 Marine Series is an argument in favour of some break 

 coming in at that horizon, but the Palseontological evidence 

 on the whole seems distinctly at variance with this view, 



1 Geology of the Hunter Eiver Coal-fields, by T. W. Edgeworth David, 

 Plate VIII. 



