F5Y A. N. LKWIS, M.C., LL.B. 39 



posits can be traced at that height above the lake round 

 the north-western and western shores. But as the lack 

 of sediments flowing from the lake is a factor against the 

 Lady Barron Creek, probably the Broad River will win 

 eventually. 



Then, again, the Broad River flows past the south- 

 western end of the lake at a distance of less than a mile, and 

 at least 100 feet lower. Each year its tributaries push far- 

 ther and farther up Mt. Monash, diverting more and more 

 water, and pushing back the narrow divide on Wombat 

 Moor. 



Lake Fenton in the future will be quite drained, 

 and is to-day an excellent example of a "Wind-Gap" in 

 the making. It also provides an example of the capture of 

 portion of the drainage of one river system by another, the 

 capture being effected not by water, but by frost and a 

 glacier, a form of river piracy which does not appear to 

 have been much noticed in Tasmania. 



I have little further information to bring forward about 

 any of the other lakes in the park, although much field 

 work yet remains to be done, and there are many problems 

 yet awaiting solution. 



The Tyenna Peak-Mt. Field West ridge appears to 

 be a sill of diabase which has forced its way horizontally 

 west from the main plateau, and now overlies beds of Knock- 

 lofty series sandstone. The valley in which the Lakes 

 Belcher and Belton lie appears to have cut right through 

 the diabase, and enlarged itself in the softer sandstone 

 below. The floor of the valley is covered with morainal 

 material, which makes it diflficult to tell whether the sand- 

 stone extends right up to the shores of the lakes, but a 

 mile below the lakes the floor of the valley consists of this 

 rock. 



REFERENCES. 



1921. Lewis, A. N. A Preliminary Survey of the Glacial 

 Remains preserved in the National Park of 

 Tasmania. Pap. and Proc. Royal Society of 

 Tasmania, 1921. 



1921. Taylor, Griffith. A Note on a Model of Mt. Field 

 Ranges, National Park of Tasmania. Pap. and 

 Proc. Royal Society of Tasmania, 1921. 



