106 



W. G. WOOLNOUGH. 



of climate) the textures of the sediments, the prevalence 

 and character of ripple marks and the degree of folding are 

 similar in the two cases. The accounts given by Maitland 1 

 in his Presidential Address to the Royal Society of Western 

 Australia, and in various publications of the Geological 

 Survey of Western Australia suggest very forcibly that the 

 Nullagine Formation of this State is to be correlated with 

 the Katherine and Roper River Beds of the Northern 

 Territory. 



While lithological resemblance in widely separated areas 

 is very misleading, the possibility of a correlation of the 

 Stirling Range Series with the two formations above men- 

 tioned must be considered. 



Physiography. 

 The general geographical features of the Stirling Range 

 and of the surrounding area described above call for more 

 detailed consideration. The courses of the streams which 

 take their rise to the north of the range are highly inter- 

 esting. To the north-east the Pallinup or Salt River runs 

 in a general south-easterly direction from a point not far 

 from Gnowangerup, on the Ongerup branch railway line. 

 It runs into the Southern Ocean near Bremer Bay. The 

 major tributaries of this stream all enter the left bank, and 

 only a few minor creeks appear to fall into the stream 

 from the other side. It appears as though the major 

 tributaries just referred to must originally have been the 

 main streams of the district, and at onetime these streams 

 probably flowed in a general southerly direction into the 

 Southern Ocean east of Albany. The main stream of the 

 Pallinup is certainly of much later origin, and lias beheaded 

 and captured the pre-existing water courses. While the 



1 Maitland, A. Gibb. Address on some problems of Western Australian 

 Geology. Pres. Add. to the Roy. Soc. of W.A., 11th July, 1916, Perth, 

 1917, p. 23. 



