32 On the occurrence of Enhydros. 



Art. VII — On the Brilliant Aurora of the 5th April, 1870. 

 By R. L. J. Ellert, Esq. 



[Read llth April, 1870.] 



Art. YIIT. — Hotes on the occurrence of Enhydros or Water 

 Stones at Beechivorth. By E.' J. Dunn, Esq. 



[Read by G. H. F. Uleich, Esq., on llth April, 1870.] 



The locality in which the enhydros occur, is on Spring 

 Creek, on the south side and close to the town of Beech worth. 



The rock is line grained gTanite, with a small outlier of 

 Silurian ; this was originally covered by 10 or ].2 feet of 

 drift, but in the course of mining operations the rock was 

 laid bare. 



A miner who worked this portion of the creek 10 years 

 since informed me that he had observed large numbers of 

 enhydros in clearing the bottom of the claim, and showed 

 me some he had saved ; after his party had ceased working, 

 another started, and cut a tail race through the granite, the 

 more effectually to drain and work the ground in the bed of 

 the creek. It was in the cutting of this tail race that they 

 were again brought to light in June 1864. 



A tunnel has recently been driven in the line of section 

 A B on^ tracing, about ] 8 feet below the surface of the rock, 

 giving an excellent opportunity for observation, and it is 

 quite obvious from what the tunnel and cutting have laid 

 open, that this has been in the line of great dislocating 

 forces of which the dyke marked on the tracing was most 

 probably the centre. 



This dyke is of singular formation. It is composed of 

 fragments of granite and occasional pieces of sandstone 

 cemented by crystallised quartz, and there are also large masses 

 of coarse chalcedony. The whole appearance of this dyke 

 suggests the idea of a chasm filled with small loose fragments 

 of rock into which a siliceous solution had penetrated, 

 coating each piece with quartz and gradually cementing 

 them into a solid mass. 



The Silurian outlier is a yellowish brown and bluish grey 

 sandstone, soft near the surface, but very hard near the 

 granite, and full of joints. It is intersected by numerous 

 blue quartz veins and straight veins of chalcedony scales 

 with clay. 



