69 



Enstatite", Basalt from Kangaroo island, 

 South Australia. 



By Evan R. Stanley. 



[Read August 2, 1910.] 

 Plate XX. 



Introduction and Previous Work. 



During the Christmas vacation of 1909 a trip was taken 

 to Kangaroo Island for the purpose of collecting specimens of 

 the basalt occurring in the Menzies District. One of the ob- 

 j 3cts of the present paper is to compare the Kangaroo Island 

 basalt with the other tertiary outflows occurring in the south- 

 eastern portions of South Australia. The paper also includes 

 a chemical analysis of the rock with petrographical descrip- 

 tions. 



About a quarter of a mile north of Kingscote the basalt 

 rests on an eroded valley of white friable sandstone, which 

 extends in a westerly direction towards the Bluff in the Bay 

 of Shoals. It forms a capping on the hills a few miles inland 

 to the west, extending from Rettie's Bluff to the western gap 

 hills near Smith's Bay. But since the geology of this part 

 of the district has already been published, no further refer- 

 ence will be made to it. 



Professor Tate's C 1 ) and Rev. W. Howchin's (2 > papers, and 

 the Report of Mr. H. Y. L. Brown on the geology pf 

 Kangaroo Island/ 3 ) have been referred to in the preparation 

 of this paper. 



Dr. Chewings ( 4 ) and Mr. J. C. Moulden < 5 > have each 

 described an olivine basalt from Kangaroo Island. 



I can find no further literature on the geology and occur- 

 rence of basalt on Kangaroo Island. 



Enstatite Basalt. Bochs 6-11. 

 Macroscopic Characters. 

 In hand specimens the rock is fine-grained, compact, show- 

 ing a few phenocryst of felspar and pyroxene not exceeding 3 



(l) Trans. Roy. Soc, S.A., vol. vi., p. 116. 

 (2)Proc. Roy. Soc, S.A., vol. xxiii., p. 198. 

 (3) Report by the Government Geologist, S.A., 1898. 

 _ (4) Geologie Slid- und Central- Australiens. Inaugural-Disser- 

 tation zur Erlangung der Doktorwurde — 1894. 

 (5) Trans. Roy. Soc, S.A., vol. xix., p. 70. 



