404 
The records of the boring at Tarleton call for little remark. 
The coal measures proper were found to continue to a depth 
of a little over 200ft. below the seam of coal, being succeeded 
by Upper Paleozoic marine beds apparently conformable to 
them and reaching to a further depth of 105ft., where, at 
370ft. 6in. from the surface, the Silurian limestone easily 
recognisable by anyone acquainted with the district was 
struck, and the question of the existence of another seam of 
coal definitely settled there at least. It may be well to note 
the circumstance of the absence from the records of any 
mention of the marine beds usually found overlying the 
Mersey coal seam. These beds, as was first pomted out by 
Mr. Hainsworth, are never found nearer the coal than 50ft., 
and, therefore, would not be met with in a section which 
begins only 41ft. 9in. above the seam. 
In my former notes on this subject I gave a brief sketch 
of the possible relations of the coal measures of Tasmania to 
those of New South Wales, in which I ought, perhaps, to. 
have pointed out that the presence of Gangamopteris in the 
Mersey beds suggests a comparison with the Bacchus Marsh - 
sandstone, and that the Thinnfeldia and Hquwisetacee of the 
upper coal measures of Tasmania indicate some relationship 
between them and the Wianamatta beds of New South Wales, 
or even the upper coal measures of Victoria and Queensland. 
Until, however, the order of succession and the continuity of 
our own rock system has been more thoroughly investigated 
and determined, and the fossil fawna and flora of its various 
formations more fully identified and described, there will be 
no sufficient basis for any satisfactory geological comparison ; 
and this defect will not be adequately remedied until the 
Geological Survey of Tasmania is again taken m hand. 
