14 



specimens. The forms common to One Tree Point, Geilston, 

 Pipe Clay Bluff, Burnet-street, and elsewhere, are found 

 here in the greatest abundance (see figs. 1, 34.) 



The sapindaceous-like form so common about Launceston, is 

 also found throughout the local formations where the beds 

 have been exposed. Between the sandy point referred to, 

 and the elevated diabasic bluff to the north against which the 

 fossiliferous clayey beds are again seen to rejDOse, there is 

 evidence of the great thickness of the system, although the 

 denudation, which has been great, together with superficial 

 drifts, have obscured the junction with the series to the 

 southward. There is every reason for the belief that the 

 district known as Sandy Bay proper was almost altogether 

 beneath the waters of this ancient lake. 



PIPECLAY BLUFF, CORNELIAN BAY. 



The next important section illustrative of the nature and 

 extent of the system is to be found in Cornelian Bay, at a 

 place called the Pipeclay Bluff. The beds at this j^lace are 

 nearly horizontal, and they quietly repose upon the Domain 

 diabase at a short distance beyond a small gravelly point 

 which juts out into the bay. The lower members are com- 

 posed of a fine whitish pipeclay, which is sometimes used 

 by the poorer classes as a whitewash. These clays are 

 readily reduced to a milky state in water, and have most 

 probably been derived from the waste of the white mud- 

 stone rocks of palaeozoic age, which abound in the immediate 

 neighbourhood, e.g., Geilston. It is in these white clayey beds 

 where the leaf impressions of many extinct species of trees 

 are most perfect and abundant. The impression of ' the fine 

 secondary veinlets of the leaves are preserved with faithful 

 delicacy. The impression of fruit valves are also seen 

 occasionally. I have on several occasions obtained the casts 

 of Pleisiocapparis leptocelyphis, F.V.M., both here and at 

 One Tree Point. This particular fruit is very common on 

 the opposite shore in the Geilston travertin beds. There is 

 no doubt of the identity of some of the leaf forms with 

 those found at Breadalbane and Muddy Creek on the Tamar, 

 while their relations with all the local leaf dejDosits, which I 

 believe to be members of the same lake system, are so 

 abundant as to j^lace the matter beyond reasonable dispute. 

 The upper members of the Pipeclay Bluff series are of a 

 more arenaceous character, and they are coloured red with 

 the surface water from the diabase above on the Domain. 



They are, however, rich in similar leaf impressions, though 

 of course less perfectly preserved. 



The sketch 4, although not drawn to scale, gives a fair idea 

 of the section at this point. It is most probable that had 



