82 W. G. WOOLNOUGH. 



These various hill groups are, as above mentioned, roughly 

 parallel, and they indicate the existence of a very well 

 defined tectonic axis running in a general east and west 

 direction. Traces of this same axis are abundant in the 

 South West Division of the State, in spite of the strong 

 dominance of the more recent and much better defined 

 meridional axis, I venture to suggest the name "Stirling 

 Axis" for the former structure line and "Darling Axis" 

 for the latter. 



To the north of the Stirling Range the plain above men- 

 tioned is simply crowded with salt lakes of all shapes and 

 sizes. From the high peaks of the range they can be 

 counted literally by the score, their white and glistening 

 surfaces being in marked contrast to the sombre dwarfed 

 vegetation of the sand plain. The zone over which these 

 extend is approximately twenty miles wide from east to 

 west. 



On the southern side of the range, and between it and 

 the Kalgan River, there stretches a line of salt lakes, quite 

 distinct in many ways from those to the north. The 

 depressions in this system occur singly, and instead of 

 being distributed promiscuously as appears to be the case 

 with their northern brethren, they are arranged in a roughly 

 linear fashion and sweep round the eastern extremity of 

 the range in a curve leading to the Pallinup River. 



Description of the Hange. 

 The range is not a continuous crest throughout its entire 

 extent. At the eastern end the hills do forma continuous 

 and almost impenetrable rampart from which rise a number 

 of imposing summits. To the west of Ooyanarup, however, 

 the continuous hill feature becomes much lower, and, 

 throughout the western half of the area, the continuity of 

 the highlands is very much broken up. Numerous lofty 

 peaks rise irregularly and abruptly from a comparatively 



