576 



THE GEOLOGY OF THE WARRUMBUNGLE MOUNTAINS, 



Possibly the weight of Mesozoic sediments to the west, after 

 Cretaceous sedimentation, has contributed to squeeze underlying 

 magmas away in an easterly direction. 



The diagrammatic plan and section (Figs. 6a and b) illustrate 

 the structure of The Spire, which is typical of that of many of 

 the other plugs. 



\^r/ 





Fig. 6. — Diagrammatic Plan and Section of Tonduron (The Spire). 



(e) Present Changes. — There are no indications of any oscilla- 

 tions or earth-movements in the present period. The Warrum- 

 bungle Mountains abound in poised rocks so delicately balanced 

 that the least earth-tremor would cast them down. The well- 

 known Bottle Rock, at Timor Rock, in itself shows that there 

 has been no earth-tremor for thousands of years. 



