140 NOTES ON THE GEOLOGY OF LAKE ST. CLAIR, 
Mr. Gould assures us that the Metamorphic rocks (not car- 
boniferous sandstones, as in Mr. Officer’s chart) form the 
deepest bed of the lake, which he had sounded so carefully in 
every direction in 1860, it is impossible from direct observa- 
tion to confirm or disprove his statement. It is when we 
leave the Lake and its affluents (the Cuvier and Narcissus), 
and traverse the region of mountain and valley, beginning 
with that of the Lakes Dixon and Undine, and thence pro- 
ceeding westward, along Gould’s well-known section, by way 
of Mount Gell, Coal Hill, Gould’s Pyramid, Rocky Hill, Camp. 
Hill, Last Hill, and Eldon Peak, across to North Eldon, that 
we have a fairly complete glimpse of the grand range and 
sequence of the varied and interesting geological formations. 
of the Western Highlands of Tasmania. The region of Lake 
St. Clair proper, with the valleys of its northern affluents, the 
Cuvier and Narcissus, disclose the merest fragment of this 
splendid sequence of rock formation; a fragment, moreover, 
which can be studied with greater advantage and in much 
greater perfection within one mile of the City of Hobart, and 
nearly everywhere in the more accessible regions of the east. 
I can say no more of this fragment of Tasmanian geology— 
which, however, embraces all our rich and interesting Permo- 
Carboniferous and Mesozoic formations—than has been so 
fully described by me already in numerous geological papers 
to this Society, and whose study has occupied my own close 
attention for a period of nearly a quarter of a centur y- The 
fact that in my work on “The Geology of Tasmania” alone 
I have devoted 123 royal quarto pages to its history, accom- 
panied by numerous plates and sections, and illustrated also 
by over 230 figures of typical fossils, is surely sufficient 
evidence that it has not been neglected, and that we have 
acquired aconsiderable knowledge ofits leading characteristics. 
Between the North Eldon River bed and Lake Dixon valley, 
however, we have, as shown in accompanyixg section, a grand 
development of rocks, embracing probably a complete series 
of all the older formations from the Archean to the Upper 
Silurian, and possibly also—in the upper conglomerates of 
some of the mountains, such as Mounts Lyell and Owen—the 
equivalents of the Devonian of other countries. The general 
character and relationship of this grand series of rocks, as 
disclosed by Mr. Gould’s section, part of which I have myself 
verified from paleontological and lithological data, may be 
summarised as follows : 
1. Row or Granite Tor—granite azis. 
2. Row Tor, across the Murchison Valley to North Eldon 
River, metamorphic schists, ete.—apparently devoid of fossils. 
3. North Eldon River, across Eldon Peak, Camp Hill, 
and Rocky Hill to Jnkerman River: base Lower 
