170 Proceedings of the Royal Society of Victoria. 



obtained as, owing to surface material, the identification of any 

 particular bed is a matter of doubt and difficulty. 



The beach outcrops show the Jurassic strata here to form part 

 of a dome of wJaich the north-western, northern, and north- 

 eastern portions are revealed by the dips near Neck 1, and the 

 south-eastern portion by the dip east of the jetty. 



The southern and south-western portion is of course hidden 

 under the sands of the Inlet. The necks have thus been formed 

 in an original dome of the Jurassics, or perhaps the dome has 

 been caused by the raising of the strata due to volcanic action 

 prior to the outburst of the neck. 



Polished Pebbles in the adjacent Jurassic Strata. 



As bearing directly upon the occurrence of pebbles in the necks 

 a few special remarks must be made upon the presence of pebbles 

 in the Jurassic sandstones among which these necks occur, or in 

 the locality at and near Savage's Hill. 



Lying on the surface, or in water channels, or exposed in 

 natural section in cliffs, pebbles of similar rocks to those described 

 from Necks 2, 3 and 4 are by no means uncommon. I have 

 found numbers of them myself close to the eastern and western 

 margins of Neck 4, and have also received a small collection from 

 Masters John and Tom Cuttriss. These pebbles have such an 

 exceedingly high polish as to attract attention immediately when 

 seen. Here, as in the necks, they occur both as entire pebbles,, 

 and as fragments. Frequently they have been broken across their 

 greater lengths, or have flakes and chips missing from their sides. 

 This has been caused by perfectly natural means, and is not due 

 to chipping by aboriginals, as pebbles are being found in channels,, 

 which are at present deepening through decomposing rock in situ, 

 and under conditions which preclude their transport from younger 

 deposits. They are also found in the decomposing rock in road 

 cuttings and other excavations. 



These pebbles are most interesting, both on account of their 

 origin, the agencies responsible for their excellent polish, and 

 their transport to the localities where found. They comprise 

 felsites, mica schists, jaspers, agates, chalcedony, carnelians, 

 cherts, quartzites, quartz, lydianite, altered sandstones, and 



