612 GREAT SERPENTINE-BELT OF NEW SOUTH WALES, V,, 



These samples came from the following localities : — 

 Nemingha limestone 



1146. Portion 118, Nemingha. 



1147. Portion 63, Nemingha (formerly Heedle's Freehold). 

 164 5. White marble, Portion 134, Nemingha. 



1646. Red marble, Portion 134, Nemingha, (known as the 

 "Nemingha red marble"). 

 Loomberah limestone(?). 



1395. Portion 121, Nemingha. 

 Moore Creek limestone. 



1 1 45. Portion 41, Woolomol. 



1148. Municipal Quarry, Spring Creek, Tamworth. 



1149. Reserve 1472, Woolomol. 



It will be seen that the rocks, as a whole, are very free from 

 dolomitisation, and that the limestones of the Nemingha horizon 

 differ from those of the Moore Creek horizon in the slightly 

 greater content of iron, alumina, magnesia, and manganese. 

 This is probably due to their association with igneous rocks, par- 

 ticularly the ferruginous brecciated keratophyres. It is clear 

 that the intrusion of the ferruginous keratophyres was accom- 

 panied by the emission of iron-bearing solutions (17, pp. 14-1 5). A 

 red colour is a frequent feature of the limestones of this horizon. 



The description of the radiolarian limestone given by the 

 previous authorsO, 10) need not be supplemented here. Mr. 

 Mingaye's analysis of this rock is cited below. 



Around the margin of the granite, the limestones have suffered 

 much alteration. This was briefly described in an earlier 

 paper(16), and also in the paper by Messrs. David and PittmanO). 

 A number of additional slices made subsequently, have added 

 but little to the information here given. The pyroxene developed 

 seems, however, to be a green variety of diopside rather than 

 omphaciie. One new type of rock has been discovered in the 

 northern, sharply b^nt anticline, in Seven-Mile Creek. It con- 

 sists almost entirely of silky-wdiite wollastonite. Its interstices 

 contain diopside, calcite, and a doubly refracting garnet. In 

 another sainple, diopside and garnet predominate over the woll- 

 astonite, and the garnet forms aggregates, half an inch in 

 diameter. A third rock contains a little scapolite. 



