42 PROF. J. W. GREGORY OX THE [Feb. I904, 



Montgomery adduced further evidence of glacial deposits in the 

 same district of Tasmania, but he adopted somewhat extreme views 

 as to the powers of ice. He remarked that * 



' the great lakes on the Central Plateau are almost prima-facie evidence of 

 glaciation,' 



and attributed to ice-erosion the formation of the deep river-gorges 

 in the north-westeru plateau of Tasmania. He argued that 



' if we allow that the deep valleys at the head of the Pieman were once occupied 

 by glaciers, we must admit that the ice came down to within 500 or 600 feet of 

 the present sea-level.' 2 



Further, he remarked that the lower limit was possibly at places 

 which are now 500 or 600 feet above sea-level, and he considered 

 that the country then stood at a lower level than at the present time. 

 Finally, he quotes Johnston's view 



' that there is no evidence of glacial actiun in the lower lying lauds, and regards 

 the glaciers as having been of small extent. While inclined to believe that the 

 ice-covering has been more extensive than he is disposed to allow, in the main 

 I agree with his view, and do not think that the whole country could have been 

 ice-bound.' A 



While Montgomery disputed part of Moore's interpretation of the 

 deposits on Mount Sedgwick, Messrs. Graham Officer, L. Balfour, 

 and E. G. Hogg denied the glacial origin of his low-level deposits 

 in the Linda Valley. They themselves reported the evidence of a 

 boulder-clay, with scratched boulders, only 1 mile from Strahan on 

 Macquarie Harbour. 4 They described this deposit as very hard, and as 

 possessing that peculiar pinkish-purple colour characteristic of some 

 of the ancient glacial beds of Victoria. They apparently regarded 

 these low-level glacial deposits near Strahan as of the same age as 

 those of Bacchus Marsh. They carefully examined the moraines 

 described by Moore in the Linda and King Valleys, and disputed 

 their glacial origin. They described the moraine at Gormanston, 

 in the Linda Valley, regarding which Moore gave most details, as 



' a great accumulation of angular debris which has gravitated from the adjoining 

 heights. We are inclined to think that much of the morainal matter referred 

 to by Mr. Moore is simply this gravitated debris.' (Loc. cit.) 



They regarded it rather as a talus-heap than a glacial deposit. The 

 moraines reported at a still lower level in the King Valley they 

 also doubted, and they suggested that the greenstone-boulders found 

 there might have been derived from local dykes. They supported 

 their explanation by the remark 



' we may add that other evidence of glaciation iu the form of roches mou- 

 tonnees and ground-moraines seemed to be quite absent.' 5 



1 Proc. Roy. Soc. Tasm. vol. iv, 1893 (1894) p. 165. 



2 Ibid. p. 104. 3 Rid. pp. 168-09. 



1 ' Geological Notes on the Country between Strahan & Lake St. Clair (Tas- 

 mania) ' Proc. Roy. Soc. Vict. n. s. vol. vii, 1894 (1895) pp. 123-24. 

 5 Ibid. p. 125. 



