Volcanic Necks at Anderson's Inlet. 175 



in several cases even the characteristic polisli, though it is not so 

 hi<jjh as that of those in tlie Jurassics, and also the peculiar and 

 numerous small semi-circular and circular fractures without 

 separation, so common among some of these pebbles, and also of 

 those among the glacial deposits of Victoria. One may be 

 specially mentioned as it is of silicitied wood, similar to that 

 from the sediments, and possesses a consideral)le polish. It is, 

 therefore, of particular interest, and assists materially in 

 supporting the opinion held. 



It is but to be expected that polished stones subjected to the 

 treatment meted out to the constituents of agglomerates and 

 tuffs would soon lose their polish through the attrition caused by 

 the volcanic and other material. There is, however, one difficulty 

 in the way of unreservedly accepting this mode of origin. This 

 is the fact that the visible ash contains comparatively little fine 

 quartz sand, such as would be expected to be found in it, were 

 similar sandstones to those forming Jurassic sediments absorbed 

 by a volcano, subsequently pulverised and mixed up, and finally 

 allowed to settle. It is perhaps probable, however, that the bulk 

 of the visible material derived from the Jurassics may have been 

 obtained from the mudstone beds of the system. 



General Remarks. 



As far as I am aware, these Anderson's Inlet necks are the first 

 of their kind, i.e., those composed of clastic volcanic materials, 

 to be described in Victoria. Messrs. T. S. Hall, M.A., and 

 G. B. Pritchard, have described^ certain clastic volcanic rocks at 

 Curlewis, near Geelong, as a spot close to a vent of the Older 

 Volcanoes, while Mr. Hall has further recorded'- two volcanic 

 necks of basalt at Mount Consultation and Diamond Hill, 

 Castlemaine. 



In New South Wales, in the neighbourhood of Sydney, at the 

 prismatic sandstone quarry in the cliffs at Bondi, there is an 

 occurrence of volcanic material, which has been briefly described^ 

 by Professor David, B.A., P.R.S. 



1 Notes on the Eocene Strata of the Bellarine Peninsula, with brief reference to other 

 deposits. Proc. Roy. Soc. Vic, vol. vi. (n.s.), 189-1, p. 3. 



2 The Geology of Castlemaine, with a sub-division of the Lower Silurian Rocks of Vic- 

 toria, and a list of Minerals. Proc. Roy. Soc. Vic, vol. vii. (N.S.), 1895, p. 81. 



3 Notes on Some Points of Basalt Eruption in New South Wales. Trans. Geol. Soc. 

 Aust., vol. i., pt. 1, p. 25. Melbourne, 1880. 



