34 Proceedings of the Royal Society of Victoria. 



They also show numerous intrusions of igneous rocks of several 

 kinds, occurring as dykes and lenticular patches, probably plugs. 

 These can be seen specially between Cooee Creek and Burnie. 

 The rock in some cases is of fine texture, and has a granitic 

 appearance; in others it is like basalt, but very much decomposed. 

 The intruded rocks are considerably altered along the contact, 

 especially, as might be expected, in the case of the larger 

 intruding masses, which have entangled among them blocks and 

 pieces of the sedimentary rocks. Several of these igneous rocks 

 have been examined by Mr. W. H. Twelvetrees, F.G.S., Govern- 

 ment Geologist of Tasmania, and Mr. W. F. Petterd, who 

 describe' them as gabbro. 



The relation of these glacial beds of Permo-Carboniferous age 

 to those of early Palaeozoic (Cambro-Silurian) age was not 

 noticed by section anywhere along this part of the coast. Near 

 Seabrook Creek their contact with the folded rocks was obscured 

 owing to the flat nature of the beach, and its sandy character. 

 Perhaps it may be visible at low tide. 



The only place back from the coast where the glacial beds were 

 noticed by me is in a small section about half a mile inland, near 

 the bridge over the Inglis River on the Table Cape road. Here 

 the rocks are shaly mudstones with pebbles, showing a dip of 

 about 4° 30' to N. 25° W. The contained pebbles are of rocks 

 similar to those before mentioned. Mr. Montgomery, however, 

 states- that the conglomerates, which he calls the "Wynyard 

 Formation," occupy an extensive area to the south of Wynyard, 

 between the Inglis and Cam Rivers, and as far back as the 

 Campbell Range, and the Arthur River. He also says: — "It is 

 possible that the Wynyard Formation is the base of the Coal 

 Measures." Mr. Waller holds the same opinion, for he says* : — 

 "There is now little reason to doubt that the 'Wynyard 

 Formation' forms the base of the Permo-Carboniferous system." 



The occurrence of coal seams in the same series as contains the 

 glacial deposits is a matter "of interest as tending to show the 

 close relationship between the glacial deposits of Permo- 



1 The Igneous Rocks of Tasmania— Trans. Aus. Inst. Mining Engineers, vol. v., 1898. 



2 Loc. cit. 

 s Loc. cit. 



