174 Proceedings of the Royal Society of Victoria. 



In the railway cuttings south of Creswick were noticed 

 isolated slate patches, probably due to both causes of squeezing 

 out and pinching off. Wedges of slate projecting into sandstone 

 were also noticed. 



Quartz was noticed associated with these conglomerates at the 

 Golden Pyke Mine and near Elphinstone tunnel, but not affected 

 by the breaking up. It is clearly of subsequent date. 



Conglomerates are also recorded in the Ordovician Rocks at 

 several patches near Lauriston, where the note probably refers to 

 some overlying rock, the areas being outlined, but not coloured 

 diflferently to the Ordovician. 



At Coimaidai there is a true conglomerate of small extent 

 described by Messrs. Officer and Hogg.^ 



On the Keilor Plains, Quarter-sheet 7 S.E., several bands of 

 conglomerate ai-e noticed. These are true conglomerate, but 

 their Ordovician age is not certain. 



An analogous mixing of beds of different character is noticed 

 by Professor David and Mr. Pittman near Tarn worth, N.S.W. 

 " Though as a rule the tuff beds are regularly'' and evenly inter- 

 bedded with the radiolarian clay shales, instances are not 

 infrequent where these rocks are confusedly intermingled 

 together." A reproduction of a photograph shows disturbed 

 masses of radiolarian shale enclosed and entangled in a thick bed 

 of submarine tuff. The two views figured are described as 

 *' laminated and contorted Radiolarian chert in submarine acidic 

 Tuff" and " Radiolarian chert with submarine Tuff crushed into 

 them."'^ 



Mr. Pittman describes certain conglomeratic rocks at Lynd- 

 hurst^ in which the included fragments of claystone are exceed- 

 ingly angular, and appear to be the remains of claystone which 

 have been intruded and broken up by the tuffaceous matrix 

 through which they are now scattered. The disturbance is 

 ascribed to injection of steam and other gases. 



The breccia from Maldon, in the Technological Museum, is 

 clearly due to brecciation of a rock subsequent to its formation. 



1 Proc. Royal Societj' Victoria, vol. x., New Series. 



2 Q.J.G.S., Iv., 1899. 



3 Records G.S. N.S.W., vol. vii. 



