I 



BY T. GRIFFITH TAYLOR. 345 



1907. One-quarter of the bed covered, not more than one foot 

 deep in the larger area. 



From these dates one can see that the floods in Lakes George 

 and Bathurst agree sufficiently closely. Their modes of origin 

 are, however, entirely dissimilar, Lake Bathurst being merely a 

 dammed-up river valley, while Lake George is an example of a 

 huge senkuugsfeld and fault-scarp which has absolutely altered 

 all the original drainage-scheme of the area comprised in its 

 basin. 



In conclusion, I desire to thank Messrs. J. Barrett (Tarago), 

 Gill (Winderadeen), Glover (Bungendore), and Donelly (Douglas) 

 for much help received while carrying out my investigations on 

 Lakes Bathurst and George. 



EXPLANATION OF PLATES. 



Plate vii. 



Map of the Lake George " Senkungsfeld " and Fault Scarp (Cullarin Range). 

 The granite area is only approximate. The high-level gravels 

 (making the old outlet) are indicated to scale as black oval patches. 

 The extent of water in February, 1907, is shown by the hatched 

 area on the east of the lake, 



Plate viii. 



Stereogram of Lake George showing the area of internal drainage. The 

 high-level gravels, south of Geary's Gap, are marked. The 

 antecedent valley of the Molonglo appears at the lower end. In 

 the north-east the main features of the Lake Bathurst area are 

 indicated. 



Plate ix. 



A view of the Lake-bed in February, 1907. The Lake has been practically 

 dry for four or five years, and is sparsely covered with a nutritious 

 salt-bush on which the sheep may be observed to be feeding. 



Plate X. 



From a photo taken in 1884 when the Lake was nearly full of water. The 

 irregular eastern coastline culminating in Governor's Hill (to the 

 right) appears in the background. 



