384 PROCEEDINGS OF SECTION C. 
No. 15.—NOTES ON SOME NEW SOUTH WALES ROCKS. 
By W. J. Ciunies Ross, B.Sc., Lond., F.G.8. 
(Read Tuesday, January 11, 1898.) 
[ Abstract. ] 
THE rocks described were obtained from the Silurian country to 
the south of Bathurst, mostly from the neighbourhood of the 
mining village of Cow Flat. Near this place dolomite occurs 
associated with a white amphibole and a green chloritic mineral. 
_Analysis of the dolomite shows carbonate of lime and carbonate 
of magnesia in the proportions of 55:6 and 43°73 per cent. respec- 
tively. The amphibole rock is fibrous and radiating, containing 
55:2 per cent. of silica, 19°6 per cent. of lime, and 19:8 of magnesia, 
together with a little oxide of iron, and alumina. The green 
mineral has been examined microscopically and chemically. 
Analysis shows it to be essentially a hydrous silicate of alumina 
and magnesia. It is very soft and polarises under the microscope. 
A short distance from the dolomite extensive beds of limestone 
occur. Analysis shows these to be nearly pure calcite. At 
Bunnamagoo, about 15 miles south of Cow Flat, dolomitie lime- 
stones also occur. These have been analysed and shown to con- 
sist of carbonate of lime and carbonate of magnesia with a 
moderate amount of carbonate of iron. 
It is believed that this is the first occasion on which either 
dolomite or chlorite has been noted in the Bathurst district. 
No. 16.—NOTES ON THE AUSTRALIAN 
THENIOPTERIDEL. 
By W.S. Duy. 
(Read Wednesday, January 12, 1898.) 
INTRODUCTION. 
Ir we adopt the term 7eniopteridee, in the original sense, for ferns 
with a certain type of venation, the range of the family is from 
the Carboniferous to the Recent. But it will be found that, as 
now generally used, the range of the family has been somewhat 
restricted, and is typically Mesozoic, a few species belonging to the 
type genus 7@wnopteris, occurring in the Upper Coal Measures and 
Permian. ‘The distribution of the members of the family is world 
wide, and the greater number of species are found in the Jurassic 
and Oolite. In Australia, as well as an imperfect specimen from 
the Greta Coal Measures, of Permo-carboniferous age, the family is 
found in great abundance through the fresh water Lower Mesozoic 
beds of ages corresponding to the Trias and Jurassic, and in the 
