172 GREAT SERPENTINK BELT OF NEW SOUTH WALES, iv., 



P.573— Abundant radiolaria have now been found in lenticular limestone 

 beds in the clayshales near Nundle. 



Pp.578-9 — For reasons given in the paper herewith, the explanation 

 suggested for the mixture of tufifand chert is withdrawn. 



P. 592 — Another small pipe of basalt, about fifty yards in diameter, occurs 

 by Hyde's Creek, at the western side of the alluviated plain. 



P. 676 — The conclusion that serpentine does not increase in density to a 

 noteworthy extent in passing from chrysotile into antigorite is open 

 to question. Professor Becke* and Professor Grubenmannf hold 

 the contrary view. The former gives the specific gravities of 

 chr^^sotile and antigorite as 2 07 and 2 64 respectively; the latter 

 gives 250 and 2"60. Leitmeier's collection of data on this pointt 

 shows that the evidence is rather incomplete. 



P. 680. line 25 — Near the head of Oakenville Creek at Hanging Rock is a 

 pyroxenite that consists almost entirely of diallage, together with 

 a little hypersthene (1168). 



■p. 696, line 6 — To the list of porphyries may be added the following :-- 



Quartz-mica-porphyrite occurs on the eastern side of Munro's 

 Creek. It is a grey rock, spangled by abundant plates of biotite. 

 Under the microscope (1173), it shows idiomorphic plates of biotite, 

 which is almost uniaxial, and contains abundant inclusions of zircon 

 which are surrounded by dark haloes, also apatite and magnetite. 

 A few pheuocrysts of plagioclase and quartz are also developed. 

 The base consists of finely divided plagioclase, with a little quartz 

 and prisms of apatite and minute flakes of biotite. Carbonates occur 

 in abundance. In hand-specimen this rock resembles a minette. 



P.698, line 28— Insert :— An odinite dyke( 1 059) intersects the spilite on 

 the Hanging Rock road. It is remarkable for the frequency with 

 which the augite crystals occurred twinned on the (101) and (122) 

 planes, producing cruciform or star-like aggregates. 



P. 703— The detailed account of the Tertiary volcanic rocks of the Western 

 Coalfield§ shows their identity with the basalt-theralite teschenite 

 series of rocks which are developed in the Liverpool and Mount 

 Royal Ranges. The list of analyses given is especially worthy of 

 attentioij. 



* Becke, Die Krystallinen Schiefer. 1. " Ueber Miueralbestand und 

 Structur." Denkschr. Matt.-Naturw. Klasse, K. Akad. der VViss. Wien, 

 1903, p.21. 



tCrubenmann, Die Krystallinen iSchiefer, Second Edition, p.55. 



Ij: Leitmeier, Article on " tSerpentin." Handbuch der Mineralchemie, 

 Bd. ii., pp. 387-403. 



§ J. E. Carne, Memoirs of the (Geological Survey of New South Wales, 

 No. 6, pp.7 1 -152, and list of analyses on p. 93. 



