BY A. J. SHEARSBY. 279 



as a couple of miles lower down the river I had previously 

 obtained fossils belonging to the Middle Devonian, but I did not 

 know how far the formation extended in the direction under 

 review. 



Seeing that the Silurian beds had dipped away under the 

 igneous belt, I came to the conclusion they had left me altogether 

 as far as that part of the country was concerned, so I turned my 

 attention to Clear Hill, which I mentioned before as one of the 

 boundaries of the river flat. This hill is about two miles north- 

 west from Glenbower anticline, and is a noticeable feature of the 

 landscape, as it forms an imposing escarpment rising to about 

 300 feet above the river, showing, even from a distance, bold 

 lines of stratification; and resting as it does on the volcanic rocks, 

 it struck me that I would find it of later origin than the Glen- 

 bower formation. 



On reaching the foot of the hill, I found its base consisted of 

 a porphyry of a similar nature to that which appeared to so much 

 advantage higher up the river and overlying the Silurian shales. 

 Resting on the porphyry are about 200 feet of shale, the lower 

 portion being of a hard silicious banded nature; to the north- 

 west of the hill the shale is followed by quartzite. Then comes 

 a bed of hard chert-like felsitic or trachytic tufif, about 30 or 

 40 feet thick. This tufif is overlaid by about 150 feet of shale, 

 somewhat calcareous, then limestone to the crown of the hill. 

 All these strata are inclined at an angle of about 50° south-west. 

 Amongst the loose material scattered about the slope of the hill 

 were many pieces of limestone which had been weathered and 

 displaced from the upper portions of the formation. One of 

 these pieces contained good specimens of Spirifera yassensis, 

 De Kon., so I knew at once I must expect to find fossils on the 

 crown of the hill of a more recent date than those I had obtained 

 higher up the river. 



On reaching the summit, the first specimen I picked up proved 

 to be Diphyphyllum gemmiforme, Eth. fil., a coral belonging to 

 the Middle Devonian age. This find was followed by Stroma- 

 topora, Cystiphyllum aastralasicum, Eth. fil., Favosites, Cyatho- 



