Deposits, Limestone Creek. 11 
fossils common to the Devonian and Silurian systems. He 
also states that some crinoidal stems — which are very 
abundant in the Stony Creek beds — are apparently “ Acti- 
nocrinus,” and that there is a small undescribed species of 
Atrypa and a species of Beyrichia. He also remarks that 
the evidence points to these specimens being either Upper 
Silurian or Lower Devonian, the geological interval between 
these two being very small. Among many highly scientific 
problems arising out of an examination of the rock masses 
in this rugged portion of our Australian Alps, that which 
relates to the metamorphism of the sedimentary rocks into 
crystalline schists is, perhaps, one of the most important. 
Of the relations between the pateozoic sediments of the 
Limestone Creek and the regional metamorphic schists of 
the Mitta Mitta source basin, I shall, I hope, have more to 
say when dealing with the geological structure of the Indi 
River and the Mitta Mitta source basin. The facts elicited 
in this paper may pave the way for more extended observa- 
tions and determinations in that respect. 
Mason, Firth & M'Cutcheon, Printers, Flinders Lane West, Melbourne. 
