586 GREAT SERPENTINE BELT OF NEW SOUTH WALES, ii., 



winn. The intrusions are noteworthy in that they are roughly oval 

 in shape rather than in definite dykes, indeed, few, narrow, lengthy 

 dykes have been observed. Naturally the intrusions are less abun- 

 dant at a distance from the granodiorite. A remarkable increase 

 in the number of intrusions, on Frenchman's Spur, may be taken 

 as evidence of approach of the underlying batholith towards the 

 surface in that neighbourhood. An intrusion of porphyry into 

 dolerite, near Moonlight Hill, is perhaps worthy of mention. 



Granite occurs again at Mount Ephraim, and may be traced 

 thence towards Yellow Rock Hill. The complicated geology of this 

 portion has not yet been mapped. In these rocks, orthoclase is 

 present in greater amount, and the rock is strictly a granite. 



Lastly, there is a mass of porphyry intruding the Nundle mud- 

 stones, near the head of Jimmie's Creek, and a few small dykes 

 have been noted between this and the river. These are all very 

 decomposed, so much so that one sill-like intrusion of porphyry, on 

 the main road, is locally termed sandstone. 



There are also rarely dykes of odinite and vosgesite, which occur 

 on Frenchman's Spur, and in Daylight Creek Gully. It is very 

 possible that these are differentiates of the granodiorite magma. 



Mention may here be made of a neck of light grey andesite 

 about 30 yards in diameter, by Oakenville Creek, on the south 

 side of Hanging Rock. Its appearance suggests that it is of some 

 considerable age, and the acidity of the plagioclase is perhaps 

 sufficient to place it in the keratophyres, in which case it may be 

 comagmatic with the Devonian spilites. 



(7). Permo-Carboniferous. — In 1891, Stonier(69) recorded 

 the occurrence of Glossopteris in shales met with in a shaft sunk 

 on Anderson's Flat, which is the area by the river, stretching from 

 Sheep Station Creek northwards. Recently, Mr. Tooth, the local 

 schoolmaster, drew the writer's attention to the occurrence of fos- 

 sils resembling those of the Permo-Carboniferous, revealed in dig- 

 ging some fence-post holes at Reichel's homestead, on Portions 11 

 and 144, at the northern end of Anderson's Flat. All the material 

 available was searched, and Mr. Tooth's discovery was fully con- 

 firmed. The rock is an impure sandstone, and contained Deltopec- 



