Prof. W. G. Woolnough — Later ite in W, Australia. 891 



In this case the collateral evidence is not so strong as it is in some 

 others. The Collie Coalfield (100 miles S.S.E.) is a Senkungsfeld in 

 which a wedge of Permo-Carboniferous Coal-measures has been let 

 down into a trough amongst the granites. This faulting was no 

 doubt pretty ancient, but the movement has evidently been rejuvenated 

 in very recent geological time. Here we have a difference of level of 

 the solid laterites of 213 feet between Yokain and Penrith on the 

 railway line immediately west of Collie. This difference is not 

 enough per se to establish the faulting, but other criteria, both 

 geological and physiographic, taken in conjunction with the laterite 



Scales Horizontal . '/ermle 



Vertical . sooft. 



Fig. 2. — Sketch-section of the Darling Eange Escarpment at Armadale, 

 Western Australia (slightly generalized), showing relation of high-level 

 and low-level laterites to possible slip-faultings. Laterite is shown black, 

 and its thickness is exaggerated. 



evidence, are amply satisfactory. Again, at Brookhampton (115 miles 

 S.), a sudden jump of 200 feet in the laterite level was what first 

 attracted the author's attention to a very decided recent fault there. 



Within the wheat belt and the Eastern Goldfields no test as to the 

 applicability of the theory has been made. In the Eastern Goldfields 

 Maclaren believes that the laterite is still growing. While this may 

 be so at isolated and favourably situated points it is quite possible 

 that the statement cannot be substantiated generally. In the south- 

 west it is found that many of the coastal streams have heavy cappings 



