D4 



W. G. WOOLNOUGH. 



is practically completely covered with this material at an 

 average level of 800 to 1000 feet above sea level. The 

 peneplain surface in the neighbourhood of Mount Barker 

 {829 feet) is no exception to the rule, and the same feature 

 is carried almost to the Kalgan River on the road to the 

 ranges. On the sand plain to the south-west, south and 

 east of the highlands patches of laterite are left uncovered, 

 at intervals, and evidently the normal peneplain conditions 

 extend over these areas. 



Immediately on entering the Ranges the laterite is lost 

 and we traverse the outcrops of the Stirling Range Series. 

 At almost the highest point of each of the "passes," how- 

 ever, laterite again puts in an appearance, and spreads out 

 in sheets to the flanks of the hills on either side. On the 

 slopes of Yungermere on the east, and of Warrungup on the 

 west of "The Pass" the altitude of the laterite is about 

 1250 feet above sea level (aneroid). In Hassell's Pass 

 approximately the same relation exists but the altitude 

 was not determined. This difference in level is very 

 suggestive of a slight, though decided, "post-plateau" 

 movement. 



Structural Features. 

 Woodward 1 describes the ranges as being folded into a 

 series of anticlines and synclines at the western end, 

 while at the eastern end the rocks are nearly horizontal. 

 The most striking feature of the geological structure of 

 the area is the almost horizontal bedding which prevails 

 throughout the entire series. For the most part the rocks 

 are bent into extremely gentle folds. In these the dips 

 are readily discernible when the great precipitous faces 

 are observed from a little distance, but are so small that 

 the inclination of the bedding planes is so masked by the 



1 Woodward, H. P. — Annual General Eeport of the Government 

 Geologist fur the year 1890, Perth, By Authority 1891. 



