211 



and parallel to the Franklin Eiver, seems to follow in the 

 line of the West Coast Eange, including the following rugged 

 peaks, composed mainly of slates, conglomerated °and 

 quartzite, viz. : — Elliot Eange, Craycroft Eange, Mount 

 Darwin, Mount Jukes, Mount Huxley, Mount Owen, Mount 

 Lyell, Mount Sedgwick, Mount Tyndal, Mount Murchison. 

 The line seems to disappear near the waters of the Mackintosh 

 Valley, which trends westward to the Pieman. It is on the 

 eastern and western slopes of the Elliot Eange anticline 

 where the lower Gordon Eiver Group crops up to the surface. 

 Between Mount Jukes and Mount Huxley the King Eiver 

 cuts through the same great axis on its westward course to 

 the head of Macquarie Harbour. At a short distance west of 

 the northern extremity of Mount Jukes the King Eiver 

 receives a tributary — the Queen Eiver, — which flows 

 southward from the southern slopes ef Mount Sedgwick. 

 The Queen Eiver, like the Franklin, runs parallel to the 

 ranges named which compose the crest of the anticlinal 

 axis. 



On the western side of the Queen Eiver a subordinate 

 ridge, sometimes rising into conspicuous prominences, as at 

 Honeysuckle Hill, runs parallel to the Queen Eiver and to 

 the axis referred to. Thus, the Queen Eiver runs in a trough 

 formed along the strike of the Gordon Eiver Group. The 

 subordinate ridge referred to is composed of an interesting 

 series of rocks, principally hydro-mica slates, with casts of 

 encrinites and fenestellce, and a fine greyish white gritty 

 sandstone, replete with imperfect impressions of brachiopods. 

 The brachiopod sandstones and hydro-mica slates are grouped 

 as " The Queen Eiver hydro-mica schists and slates," and 

 from their position in relation to the main axis, and from the 

 facies of the fossil organisms, I am inclined to believe that 

 they not only succeed the members of the Gordon Eiver 

 Group, but mark the lower limits of the Hpper Silurian 

 division, and it is worthy of observation that the recently 

 discovered auriferous "lodes" at Mount Lyell occur 

 traversing rocks which appear to be identical with the hydro- 

 mica schists of the group found a little further to the 

 south. 



The first evidence of the fossiliferous rocks in this part of 

 the country was obtained by Mr. T. B. Moore, while 

 engaged in opening up new tracks in this rugged country in 

 the neighbourhood of the King Eiver in the year 1884. 

 Specimens of the " brachiopod sandstone " were also obtained 

 for me by Mr. Atkins, of Hobart, from the same vicinity, 

 but at a point nearer the Macquarie Harbour. 



Although the impressions of casts of brachiopods are very 

 numerous, they are invariably imperfect, and rarely exhibit 



