356 GREAT SERPENTINE BELT Ot NEW SOUTH WALES, vii., 



length appears in Portion 54, Loomberali, and then no sign of 

 serpentine until Portion 39. Here, nearly six miles from the 

 last occurrence, the serpentine is found in intimate relation 

 with a mass of vesicular spilite. A single band of spilite has 

 apparently been broken by oblique faults, and, into these, 

 peridotite has been injected. The northernmost patch appears 

 actually to invade the spilite, but the rubbly nature of the ex- 

 posure renders this uncertain. The masses of serpentine to the 

 south have been thrust between the fragments of the sheared mass 

 of spilite, and, beyond these, .serpentine occurs here and there in 

 the line of shearing passing southwards up a small gully. Again 

 there is a gap of two miles free from serpentine. It then appears 

 south of Cope's Creek, as a narrow zone, widening to the south, 

 extending through a small saddle into the watershed of Pipeclay 

 Creek. This mass of serpentine contains abundant intrusions of 

 dolerite, of the type frequently present in such association, already 

 described from the neighbourhood of Bowling Alle3^ Point, and 

 Moonbi(5, pp.156-7; 6, pp. 6 15-6), 



No further serpentine is seen till on tlic soutbern side of the Hat 

 t>l)ening at the mouth of Hyde's Creek, when a small patch appears 

 on the north side of the Peel River in Portion 9, Parish of Dun- 

 gowan, and is continued south of the river for a couple of hundred 

 yards, until it is cut off by the southern boundary -fault of this 

 ancient senkungsfeld-area (see below, p. 360). Its further 

 development commences in 8heep ^Station Creek a mile east of 

 here, and continues to Hanging Rock, as already described (3, 

 pp. 582-5). 



Gratioithjire. 



A single narrow \ein of creamy-white granophyre occurs in 

 Portion 35, and is, perhaps, to be correlated with the veins of 

 granophyre and porphyry associated with the gi-anite in the 

 Nundle District, though the neare^^t known occurrence of this is ten 

 miles away. It consists of fairly idiomorphic but very kaolinised 

 plagioclase, zoned but appai*ently acid in the main. These form 

 prisms 0-8 x O'l mm. in cross-section, with interstitial quartz 

 and sometimes granophyric intergrowth. Small, brown-green 



