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THE GEOLOGY AND PETROLOGY OF THE GllEAT 

 SERPENTINE BELT OF NEW SOUTH AY ALES. 



Part viii. The Extension of the Great Serpentine Belt 



FROM THE NUNDLE DISTRICT TO THE CoAST. 



By W. N. Benson, B.A., D.Sc, F.G.S., Professor of Geology 

 AND Mineralogy in the University of Otago, N.Z., late 



LiNNEAN MaCLEAY FeLLOW OF THE SOCIETY IN GeOLOGY, 



(With one Text-figure). 



Tlie previous parts published liave described, in greater or less 

 detail, the whole of the country along the Serpenthie Belt, ex- 

 tending from Warialda to I fanging Rock, a distance of nearly 

 150 miles. Some facts, however, have been collected with regard 

 to the further extension of the Belt, which may be wortljy of 

 record before this series of papers is concluded. 



Somewhat to the west of the Serpentine-line, and about twelve 

 miles south of Nundle, commences, on Wombramurra Creek, one 

 of the largest masses of limestone in the State, which mass con- 

 tinues for some miles across the Main Divide, at Crawney Pass, 

 into the head of the Isis River. This has, as yet, been little 

 studied. It was briefly described by Phillips, in 1875(1). Mr. 

 Etheridge described a new coral therefrom, in 1898(2); and Mr. 

 Dun, two years later, determined a large collection of fossils ob- 

 tained by Mr. Cullen(3). It was visited by the writer in 1910, 

 and has recently been studied by Mr. Came, and is to be de- 

 scribed in his forthcoming account of the limestones of New 

 South Wales (4). Yery little is known of its stratigraphical re- 

 lationships to the other Devonian rocks; it seems to occur among 

 a series of banded claystones like those of the upper portion of 

 the Taraworth Series, or even of the Barraba Series, though, as 



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