54:8 THE GEOLOGY OF NEWBRIDGE, NEAR BATHURST, N.S.W., 



chlorite occur as before, but ores are rarer. A few unmistak- 

 able traces of Pentanierus Knightii are to be seen on weathered 

 surfaces. This fixes the age as Upper Silurian, Other markings 

 occur, which may be corals but are very doubtful. 



In extent this patch of limestone may be the largest of the 

 group. To the north it is overlain by alluvium, while to the 

 south it runs into a hill for some distance, for slate does not 

 appear to outcrop for a long way to the south of it. 



iv. (Occurs in the fl-bend of the Caloola Creek, op[)Osite Por- 

 tions 100 and 99, Parish of Lowry). This is shown by a block of 

 marble in the creek-bed, visible onl}' at low water. If it is 

 really in situ, it can be part onl}^ of a very small lens, for the 

 slates appear to be in situ within 20 j^ards of it. 



V. (At the northern end of Portion 99, Parish of Lowry). A 

 small almost circular patch, about a chain across, and one-quarter 

 of a mile south-west of the first occurrence here described. The 

 marble is of good qualit3\ 



In none of the quarries has the junction between the slates 

 and limestones been exposed, so that the dip of the strata here 

 cannot, by this means, be determined yet. The strike, however, 

 is N.N.E., as is shown by the direction of the major axes of the 

 lenses of limestone. On the eastern side of Queen Charlotte 

 Yale there is a series of limestone patches, some containing 

 Pentamerus knightii, running approximately in this jST.N.E. 

 direction through Cow Flat, and terminating on the Mount, 

 where they are highly dolomitised, and contain 43*73 per cent, 

 of mao^nesium carbonate.* If we continue on the same direction 

 from here across the granites of the Bathurst Plains, we again 

 come on limestones at Fernbrook, and at Limekilns, very rich in 

 fossil content, Stromatojyora, Favosites, Phillipsastrcea and some 

 Pentameri.f There thus appears to have been a continuous 

 horizon, with a N.N.E. strike, extending for 30 miles. As to 

 its dip, there is little definite evidence. The Belmore copper lode 



* W. Clunies Ross, Kept. Aust. Assoc. Adv. Sci. 1898, p. 384. 

 t W. Clunies Ross, Q.J.G.S. 1894, p. 1 13. 



