Volcanic NecJtS at Anderson's Inlet. Ill 



silicitied wood. Most of these rocks are quite foreiis^u to the 

 district as far as known. Mr. Jas. Stirling records^ a small 

 outcrop of felsitic rocks at Waratah Bay, but no mica schistS) 

 cherts and jaspers have been recorded /« situ within at least 

 30 miles of the spot. Though inliers of Silurian, such as those 

 of Kongwak and the Powlett, do occur, there are no discovered 

 remnants of older or more altered rock masses within it such as 

 would furnish pebbles of the characters of some of those found. 

 The evidence, therefore, is in favour of a comparatively distant 

 origin for portion at least of the pebbles. 



The polishing is not due to running water. Of this there can 

 be no doubt. The only action to which it appears attributable 

 is that of wind-blown sand, or wind-blown frozen snow. 



The agency by wliich they were transported to their present 

 position cannot have been the same as that which brought the 

 finer sediments. Both on account of their size and the character 

 of the rock they are composed of, this is quite impossible. The 

 medium that conveyed or removed the material, chiefly fel- 

 spathic quartz sand, from its source in a plutonic (probably a 

 granite) area could not have brought down tlie heavy pebbles 

 such as are found. The nature of the pebbles, also, suggests their 

 derivation from a metamorphic area, which, if not more remote 

 than that from which the sediments were derived, was, perhaps, 

 quite a distinct one. Two means of transport suggest themselves : 

 1. That by driftwood ; 2. That by floating ice. 



Land Sukface during the Jurassic Period. 



Before briefly discussing these probable agencies, a few remarks 

 may be made on the probable nature of the land surface l)order- 

 ing part of the basin in which the Jura.ssic sediments were 

 deposited. 



It seems probable that the pebbles were originally of glacial 

 origin, and were derived indirectly from the disintegration of 

 pre-existing glacial deposits on the margin of the Jurassic basin. 



The occurrence of glacial deposits in north central and north 

 eastern Victoria, as at Carisbrook, Wild Duck Creek near Heath- 



1 Notes on the Silver Deposits and Limestone Beds of Waratah Bay. Proj^r. Rep. Geol. 

 Sur. Tic, No. viii. 



