574 Reports and Proceedings — Geological Society of London. 



in lengtb, and are made up essentially of magnetite interlaminated 

 with apatite. In addition to these mines, which are far north of 

 the Arctic Circle (70 miles N. and 120 miles W. of the Gulf 

 of Bothnia), he had had an opportunity of visitiog the deposits of 

 Kirunavara, 100 miles still farther north; here the rocks are of 

 a slaty character, and the magnetite is included in felsite-porphyry. 

 The Gellivara ores are contemporaneous with the surrounding rock, 

 while the Kirunavara ores appear to have been introduced at a later 

 period. Mr. Bauerman exhibited specimens from both districts, and 

 drew attention to the phenomena of polishing by wind-action, etc. 



The following communications were read : — 



1. " On the Palfeozoic Eadiolarian Eocks of New South Wales." 

 By Professor T. W. Edgeworth David, B.A., F.G.S., and E. F. 

 Pittman, Esq., Assoc. E.S.M., Government Geologist, New South 

 Wales. 



The first evidence of the presence of radiolaria in the rocks of 

 New South Wales was obtained by Professor David in 1895, as the 

 result of a microscopic examination of some red jaspers from 

 different areas. Further research by the same author was stimulated 

 and guided by seeing the radiolarian rocks recently discovered in 

 Mullion Island, Cornwall, and in the Culm districts of Devonshire, 

 during a visit to England in 1896 ; and on his return to Sydney he 

 recognized the existence of a series of cherts, lydites, and siliceous 

 limestones containing radiolaria in four distinct areas. A brief 

 preliminary account of these rocks was communicated to the 

 Linnean Society of New South Wales, and specimens were 

 forwarded to Dr. G. J. Hinde for determination of the radiolaria. 

 Subsequently, in conjunction with Mr. Pittman, a detailed examina- 

 tion of the rocks in the field was carried out, and the results are 

 given in the present paper. In this final investigation it was 

 ascertained that not only in the cherts and siliceous limestones, but 

 also in the jointed claystones which form the prevalent sedimentary 

 rocks of the Tamworth district, radiolaria were distributed in vast 

 numbers. 



The three chief areas of radiolarian rocks in New South Wales 

 are Bingara, Barraba, and Tamworth, situated in the New England 

 District, between 180 and 270 miles north of Sydney. Bingara, the 

 farthest locality, is 30 miles north of Barraba ; and this latter is 

 60 miles north of Tamworth. The character of the rocks in these 

 localities tends to show that they belong to the same series ; and in 

 this case its extension from south to north is about 85 miles. 



The fourth area of radiolarian rocks is at the well-known Jenolan 

 Caves, about 67 miles due west of Sydney and about 200 miles 

 south-by-west of Tamworth. It is probable that the Jenolan rocks 

 may be on a somewhat different, perhaps lower, horizon than those 

 of the northern district. 



At Bingara and Barraba the radiolarian rocks consist of red jaspers 

 and fine-grained jointed claj'stones, accompanied by thick coral- 

 limestones and numerous beds of interstratified tufaceous materials. 



