]76 F. L. StiUwell: 



The surrounding newer basalt forms the eastern fringe of the 

 extensive volcanic plains of the Western District. It is petro- 

 graphically described as an olivine anorthoclase (?) basalt. 



In the valley and creek beds in the north-east portion of the 

 area occurs a limestone. This limestone has an irregular dis- 

 tribution and shows great variability in character. It is im- 

 bedded and contains eroded boulders of newer basalt and shells 

 of living organisms. It is therefore of recent age, and younger 

 than the newer basalt, and has a chemical rather than a 

 mechanical origin. Chemical analyses show that it is impure 

 And highly magnesian, and a petrographical examination proves 

 the presence of dolomite in small amount. 



Literature. 



1. Hart, T. S.— The Volcanic Rocks of the Melbourne District. 



Vict. Nat., vol. xi., No. 5 (August, 1894), p. 75. 



2. Butler, F. H. — Kaolinisation and other changes in West of 



England Hocks. Min. Mag., Nov., 1908, vol. xv.. No. 

 69, pp. 128-146. 



3. Dunn, E. J, — Report on Kaolin Deposit, Bulla Creek, near 



Melbourne. Mon. Prog. Rept, Geol. Surv. Vic, Nos. 8 

 and 9, p. 52. 



4. Hall, T. S., and Pritchard, G. B.— Tertiaries in the neigh- 



bourhood of Melbourne. Proc. Roy. Soc. Vic, vol. ix. 

 (New Series, 1897). 



5. Hall, T. S,. and Pritchard, G. B.— The Older Tertiaries of 



Maude, etc Proc. Roy. Soc. Vic, vol. vii. (New Series, 

 1895), p. 192. 



6. Murray, R. A. F. — Victoria : Geology and Physical Geo- 



graphy (1887), p. 106. 



7. Daly, R. A.— Journ. of Geol., vol. xvi., 1908, p. 409. 



8. Selwyn, A. R. C. — Deiscriptive Catalogue of Rocks and 



Minerals in the National Museum, 1868. 



9. Ulrich. G. H. F. — Contribution to the Mineralogy of Vic- 



toria. D. 32 

 10. Armitage, R. W.^Notes on the Country about West Essen- 

 don. Vict. Nat., vol. xxvii., No. 5 (Sept., 1910). 



