Geolixji/ of tlic Country o.bout Anglesea. 49 



here and there t'ra<rinents of what appear to be basaltic scoria 

 are to be found. They are, however, quite decomposed to clay, 

 and only the weathered face gives any clue to their nature. 

 Search aniontr the pebbles at the foot yielded a few fragments 

 of dense basalt, which may or may not have been derived from 

 this bed. The clay conglomerate contains a few quartz pebbles, 

 and sand grains are coinmon, while a few rock fragments occur 

 which all seem to be derived from rocks similar to the tinder- 

 lying series, and of tertiary age. 



The great bulk of the bed is evidently made up of fragments 

 of a basaltic rock, and I feel convinced, that it is a tutf. The 

 thick tuff beds associated with the Airey s Inlet basalt are, it 

 may be mentioned, only about three miles away along the 

 coast. Mr. A. G. Campbell, who noticed the basalt fragments 

 iibout here, believed that the bed was derived by denudation 

 from a basalt flow. 



If the clay bed be really a tuff, it then throws interesting 

 light on the Spi'ing Creek series, as well as on that of Airey's 

 Inlet. To this I shall refer after a short description of the 

 latter. 



In walking to the westward along the coast from Point 

 Koadknight, we see very little but sand dunes for about three 

 miles, when we encounter cliffs of yellowish and drab tuft's. 

 < )verlying these is a series of ferruginous sands and gravels. 

 The tuffs are splendidly shown in cliff' section for a couple of 

 miles to a thickness of from 20 to 30 feet. They vary much in 

 the size of the component fragments, and are very much de- 

 composed. In places basaltic fragniients up to two feet in 

 diameter are common, together with fragments of sandstone 

 and shale of doubtful age. Near Eagle's Nest solid basalt forms 

 the base of the cliffs, and underlies the ash beds. As a rule the 

 liasalt is black and dense, but occasionally its upper part is 

 vesicular, and tilled with amygdules of lime. It is possible that 

 a careful examination of the dip of the tuffs may fix the site 

 of the vent which cannot be very far away, if we may judge 

 by the size of the included fragments. It is probable that it 

 lies out to sea. 



The upper surface of the basalt has been deeply denuded, 

 and on thi'^ worn surface lie the Airey's Inlet Limestones. These 



