136 NOTES ON THE GEOLOGY OF LAKE ST. CLAIR. 
Pearson, and common elsewhere throughout Eastern Tas- 
mania. . 
4. Upper Mesozoic Sandstones, Shales, and Opper Coat 
Measures (Tas.) with Zeugophyllites, Thinnfeldia, Sphenopteris, 
Pecopteris, Neuropteris, Alethopteris, Odontopteris, Teeniopteris, — 
Cyclopteris, Baiera, Salisburia, etc., as at Ben Lomond, 
Mount Nicholas, Fingal Tier, Mount Gray, slopes of Mount 
Wellington, and probably Mount Pelion and Coal Hill, and 
common elsewhere throughout Eastern Tasmania. 
5. Greenstones—Massive, Core Crest (?), or Covering Cap (?) 
—associated with mesozoic coal measures, and occupying the 
summit of Great Plateau and of most of our mountains in 
Eastern Tasmania. 
6. Occasionally lignites and Tertiary leaf beds, as on Magnet 
Range. 
7. Occasionally (in patches) olivine basalt sheets, as at 
Bronte, River Nive, and Lake Sorell. 
While I cannot but compliment Mr. Officer for his interest- 
ing notes on the geology of the Lake St. Clair region, and 
for the general accuracy of his observations, so far as they go, 
it is unfortunate that his lack of acquaintance with the 
literature of Tasmanian Geology should have led him to give 
so bald an account of the most familiar geological features of 
a region which is classic to the local observer as the field 
wherein one of Tasmania’s ablest geologists (Mr. Charles 
Gould, during the years 1860, 1861, and 1862) accomplished 
his best work as an explorer, geographer, and geologist. 
Even Mr. Officer’s geological sketch, with its details of lake- 
depth, mountain and ravine, would not now be possible, were 
it not almost entirely based upon the earlier elaborate 
investigations of Mr. Charles Gould, covering a period of two 
or three years, and aided by a field staff of about 32 men. 
This much-undervalued observer not only gave us all our 
existing routes and tracks in this western region, but, owing 
to his long and ably conducted explorations, he gave us, in his 
geological and physiographical maps and vertical sections of 
1860 and 1862, the knowledge of all the physiographical 
features and principal geological characteristics which 
we are possessed of at the present moment, and which form, 
for this region, the base of the delineations on our latest 
survey maps, which are partly reproduced by Mr. Officer. 
During my own later explorations in this region, I could only, 
by the aid of more definite paleontological data, confirm what 
Gould so well described and delineated over thirty years ago. 
Nor, in spite of some adverse conceptions of Mr. Officer, so far 
as I am concerned, as regards the still doubtful age of the 
greenstones of the Great Plateau, can I admit any novelty of 
