234 



NOTE ON THE GUYRA LAGOON, N.S.W. 



much lower, rising only to about 20 or 30 feet At the extreme 

 south-east corner the ground rises only a few feet above what 

 was once the normal water-level of the lake. This breach in the 

 basalt-ring surrounding the lake appears to be the only inlet. 

 Through this inlet flows the water from the direction of Black 

 Mountain, so that the catchment area of the lake is of very small 



Fig.l. 



-Map of the Guyra Lagoon, showing (i.) the drainage-system; and 

 (ii. ) the inner crater at A. 



extent. The total length of the catchment area is probably only 

 3 or 4 miles, and its breadth rather less than 2 miles. The hills 

 surrounding the lake are well timbered, and slope at about 15° to 

 20° towards the lake-bed. The old water-level in the lake is well 

 marked, indicating the stability of the lake for a considerable 

 time. Nowhere could the water have exceeded a depth of 10 

 feet. Within the lake, at its south-western extremity, is a 

 crescentic ridge of basalt parallel to the shore-line. This ridge 

 gives rise to several small islands when the lake is full (see text.- 



fig.l). 



