280 REPORTS OF COMMITTEES. 



2.— NOTE ON GLACIATION IN TASMANIA. 

 By W. H. TWELVETREE8. 



Permo-Carhoniferous Glaciation. — At Easter last year the Permo- 

 Carboniferous boulder- till near Wynyard was visited by Professor 

 T. W. E. David, who, besides establishing the existence of an ice pave- 

 ment, made a collection of many of the stones embedded in the clay 

 matrix, with the idea that by their means the locality of their parent 

 rocks might possibly be recognised. 



An examination of the specimens gathered, however, has not 

 disclosed any very distinctive criteria. 



Some indurated dark shale or slate was submitted to Mr. T. S. 

 Hall, M.A., by Professor David for the determination of some impres- 

 sions of graptolites which were visible, and that observer has identified 

 some of them as belonging to Phyllograptus typus (J. Hall), Tetragraptus 

 serra (Brong.), both of Lower Ordovician age. Mr. Hall says the rest 

 are indeterminate, though there appears to be a Diplograptus among 

 them. 



The same stone contained a Brachiopod and some Phyllocarids 

 which have been determined by Mr. F. Chapman, F.L.S., &c., of the 

 National Museum, Melbourne, as Siphonotreta Maccoyi (Chapman), 

 and Caryocaris Wrightii (Salter) respectively. Mr. Chapman's paper 

 describing these fossils accompanies this note. He fixes the age as 

 Lower Ordovician. 



Fossils found previously in the blocks of stone or boulders of this 

 Wynyard bed were submitted to Mr. R. Etheridge by Mr. T. Stephens, 

 M.A., and described by the former in a paper published in the proceed- 

 ings of the Royal Society of Tasmania for 1882. These were Penta- 

 merus Tasmaniensis (R. Etheridge, jun.) ; Spirifer sp. ; Spirifer 

 resembling S. plicatdla (Linn.) ; Spirifer not unlike S. crispa 

 (Hisinger) or S. elevata (Dalman) ; Orthis, resembling Orthis hiforata 

 (Schlotheim) ; fragment resembling a Strophomena ; Ophileta 

 (probably) ; Tentaculites. Mr. Etheridge concluded that it might 

 be said that at least some of the Table Cape boulders are of Upper 

 Silurian age, the Upper Llandovery beds, or May Hill sandstone, 

 putting in a very strong claim for recognition. 



Upper Silurian calcareous and sandstone beds, fossiliferous, occur 

 upwards of 30 miles south-west of Wynyard, and slates and schists 

 of undetermined age occupy the valley bottoms not far to the south ; 

 but the exact parent rocks of these fragments have not been identified. 

 The pink granite occurring as stones and boulders in the conglomerate 

 is not now seen nearer than the Upper Bhiihe and the Dial Range. 

 The slate ii not quite like any that I have seen in that part of the 

 island, while the evidence obtainable from the numerous specimens 

 of quartzite in the till ii too vague for use. 



