BY W. N. BENSON. 595 



Moore Creek, Loomberah, or Nemingha horizons respectively. 

 Favosites gothlatidica ... 

 F. basaltica var. '^yiooiibiensis 

 F. salebrosa 

 F. multitabulata 

 A Stromatoporoid 

 Diphyphyllum porteri ... 

 D. sp.nov. 

 * Sanidophyllum davidis 

 IVyplastna, sp.nov. 



* Spongophyllani yiyanteum 

 *AcHnocystis cornubovis 



Cyathophyllum sp. 

 Cystiphyllwn auslralasiciim 



* Microplasma parallehtm 

 Heliolites po7'osa 



*Sy7'ingopo7-a auloporoides 



Litophylhiin konincki ... 



Alveolites sp. ... 



Endophyllum schlueteri. 



Atrypa sp. 



Euomphalus sp. 



The association of tlie species marked with an asterisk, and 

 the abundance of Heliolites are features very characteristic of 

 the Moore Creek limestone, with which the great development 

 of pure grey or white limestone also accords. The absence of 

 the great abundance of Stromatoporoids, or Pentameroid shells, 

 or of the signs of shallow water, distinguishes this from the 

 Loomberah Limestone; and the want of association with frag- 

 mental igneous rocks, or with banded cherts, separates it from 

 the Nemingha Limestone. It seems permissible, therefore, to 

 correlate it with the Moore Creek Limestone. 



East from here, across the Main Divide, the (Serpentine Belt 

 extends across the headwaters of the Manning River, through 

 extremely rugged and broken country. It is the deeply dissected 

 remnant of a plateau, over which extends a widespread series of 

 more or less alkaline basic rocks, which were described by Mr. 



