334 



GREAT SERPENTINE BELT OF NEW SOUTH WALES, Vll., 



pink, reddish or mottled: less commonly, it is grey. It is often 

 highly brecciated, and in particular in Cope's Creek, the rock is 

 clearly made up of fragments of corals and of crinoids. The 

 colouration of the rock appears due to the introduction of ferru- 

 ginous solutions. The composition of the stone is shown in the 

 following Table; the analyses are due to the chemists of the 

 Geological Survey (13). 



1781-2 — Red Marble, Portion 58, Loomberah. 



1783 — Pink Marble, Portion 58, Loomberah. 



1785— Pink Marble, U miles N.N.W. of Black Jack Mountain. 



1786— Red Marble, 1^ miles N.N.W. of Black Jack Mountain. 



1787 — Pink Marble, Portion 35, Loomberah. 



1788 — Pink Marble, east side of Black Jack Mountain. 



Concerning the depth of origin of this limestone, we have to 

 note the absence of evidence of littoral conditions though the 

 limestone is often brecciated. Radiolarian chert is directly 

 associated with it. Mr. Chapman's remarks on this point may 

 be noted. {See Appendix i.). 



The Loomberah Limestone. 

 A second definite zone is that of the Loomberah Limestone. 

 Just beyond the north-western corner of the Parish of Loom- 

 berah, namely, in Portion 10, Parish of Calala, is a belt of lime- 

 stone about a hundred yards long and ten to twelve feet thick, 

 containing HelioliUs, Tryiilasma., and crinoids. It dips W.5°S. 

 at 70'. To the east of it are several bands of tuff and a sill of 

 dolerite, the whole lying within normal radiolarian cherty clay- 

 stones. Followed to tlie south east, the limestone ceases, and 

 the tuff-breccia becomes ricli in fragments of limestone. It is 



