572 GREAT SERPENTINE BELT OF NEW SOUTH WALES, ti., 



the true dip is seen, like the cleavage-plane, it has a general 

 strike of N.20°W., and a dip varying from the vertical to 70° to 

 the east, or occasionally to the west. In the Swamp Oak dis- 

 trict, some fifteen miles to the north-east, Stonier(26) has shown 

 that the rocks (presumably of the Woolomin Series) are in normal 

 folds quite independently of the cleavage, which is parallel to 

 that at Nundle. At present, however, there is no means of 

 checking this assumed identity; the Swamp Oak rocks may be 

 even a Permo-Carboniferous mass nipped in like those at Emma- 

 ville(27). 



The thickness of the Woolomin Series is quite indefinite, and 

 without doubt there is much repetition by faulting and folding. 

 The presence of so many parallel jasper bands is evidence of this, 

 but it would need a careful study, yard by yard, with much 

 microscopical work, of the section from Warden's to Duncan's 

 Creeks, to determine the horizons, and how often they are 

 repeated. Even then the thickness will be unknown. There is 

 no base, and the series is terminated by the fault of the serpentine- 

 line. 



(2). Bowling Alley Series. 



This occupies the central portion of the map, and may be 

 directly correlated with the Tamworth Series. It may be divided 

 into five portions, the horizon of the limestone being taken as 

 the line of reference, though it is true, that the limestone is not 

 confined to one narrow zone. 



The line of section at Bowling Alley Point, westward from 

 Chrome Hill, is the most typical, and, on this, the subdivisions 

 have been erected. Further north, the succession is less well 

 known; further south, it is more disturbed, but, throughout, the 

 limestone serves as a good horizon of reference for mapping. 



(a). Lower, Banded, Radiolarian Clay stones. — These occur next 

 to the serpentine on Chrome Hill, one mile east of Nundle, may 

 be traced thence up the west side of Munro's Creek, where they 

 are much disturbed, and occur again south of Hanging Rock, in 

 the small triangle of Bowling Alley rocks that lie east of the 

 serpentine. In all three localities, the rocks are rather cherty. 



