322 GREAT SERPENtlNE BELT OP NEW SOUTH WALES, vii., 



masses of keratophyre, which extend into the Nundle District, 

 but are barely represented in the Tamworth District. Several 

 varieties of dolerites, not yet seen elsewhere in the Devonian 

 rocks of New South Wales, appear in this area. Again, we 

 have the most typical instance of highly altered pillow-lavas yet 

 discovered in the Serpentine Belt. The serpentine, too, is by 

 no means as continuous in this region as elsewhere, but is 

 broken into small, isolated lenticles, and the line of separation 

 of the Eastern and \^'estern series becomes obscure. Finally, 

 we may note the occurrence of peculiar tectonic features in this 

 region, developed to a greater degree than in adjacent areas. 



The writer is much indebted to Mr. G. McA. King, the 

 General Manager of the Peel River Company, for permission to 

 enter and study the geology of portion of the estate of that Com- 

 pany, and to numerous farmers in the Parish of Loomberah for 

 similar kindness. In particular, he is indebted to Mr. Ponto, 

 of Pendene, for kind hospitality, and to Mr. David Carter for 

 help in securing the rich collection of fossils obtained from his 

 property. This was supplemented by specimens from the collec- 

 tion of Mr. S. M. Tout, who was the first to bring the Loom- 

 berah limestones under scientific notice. 



Mr. Etheridge has very kindly examined the Tryplasmas re- 

 corded herein, and Mr. F. Chapman, the Chtetetesand Foramin- 

 ifera. To Mr. Dun, the writer is indebted, not only for the 

 determination of all the other fossils, aiid the valuable notes 

 included in this paper, but also for his constant interest in the 

 work, and helpful discussion of the stratigraphic problems that 

 arose. To the chemists of the Geological Survey are due the 

 analyses of the limestones cited on pp.334 and 338, which were 

 obtained from specimens collected by the writer. To all these 

 gentlemen, his best thanks are due. Mr. Mingaye's very com- 

 plete rock-analyses, cited on p. 368, add great value to the petro- 

 logical studies. 



Previous Literature. 



The references to this region by previous writers have been 

 very scanty. It was visited b}^ the Rev. W. B. Clarke in 1853, 

 and the occurrence of Phillipsastrcea on Cope's Creek was ob- 



