GEOLOGY OF THE COOMA DISTRICT, N.S.W. 217 
and eventually merges into the Berridale fault-block to the 
south and §8.W. of Cooma. This Colinton senkungsfeld is 
tilted towards the north. 
It was probably the same series of earth movements as 
caused the faulting and differential elevation which also 
shifted the divide and altered the drainage system of the 
region. The present divide, which runs roughly EK. 30° S. 
at a distance of about 9 miles from Cooma, is very low, 
and is the result of recent slight tilting of the whole 
country towards the N.H. The old divide is placed by 
Stissmilch between Bredbo and Colinton, and by Taylor at — 
Tharwa, 25 miles farther north. Both authors are, how- 
ever, agreed that the Upper Murrumbidgee used to form 
part of the Snowy River system, and that for the part of 
the river between Mittagang Bridge and the old divide 
there has been a reversal of flow, or in other words that 
this part also of the river used to belong to the Snowy 
system, and is now really an obsequent stream. 
The above is in the main an abstract of Sussmilch’s views 
as outlined in his extremely interesting and suggestive 
paper, and there can be little doubt as to their general 
accuracy. 
It might be urged that the so-called Berridale fault-block 
is due to differential erosion. It is certainly remarkable 
that to the west of the scarp the rocks are schist and 
gneiss, while to the east the country is composed mainly 
of less resistant slates, etc., so that one might expect a 
greater degree of erosion to the east than to the west. 
And again the Berridale fault-block merges to the south 
into the general level of the Colinton senkungsfeld just 
about where the gneiss-injected crystalline schists cease. 
But on the other hand we have evidence of recent uplift 
and dissection of the fault-block in the presence of the 
youthful Murrumbidgee valley, which is in places a veritable 
