258 



Charles Fenner 



The Pentland Hills are better knoAvn to travellers by road, the 

 V-shaped valleys which have formed them, being somewhat impres- 

 sive in appearance. They mark an area of good pastoral country, 



g. hill 



Parwan va)ley. 



Oiaer Basa.)!- Kills, 

 re&iduals. 



Fig. 20. — Diagrams and sketches of various residual hills in the Ballan 

 Sunkland, as detailed in Section IXa. O.B.- Older Basalts. 

 N.B. — Newer Basalts. 



and were early settled ; these hills were among the very few features 

 of the Werribee area referred to by Brough Smyth (ref. 49). Pro- 

 fessor David has also felicitously described them (ref. 13). 



Close to the Pentland hills is " The Island," formed in the loop 

 between the Myrniong and the Werribee, above their junction (see 

 Fig. 36.) This feature is surrounded on three sides by deep val- 

 leys, and there is a low wind-gap on the fourth side. To use the 

 phrase of Mr. C. C. Brittlebank, this part has been '' thrice a valley 

 and now a hill." The base is mainly glacial, and we may fairly 

 assume a valley for the glacier. Above this formation tertiary leaf 

 beds occur — probably fluviatile, giving us a second valley period. 

 In these beds at a later date, was eroded the (third) valley of the 

 *' ancient Myrniong," now filled by newer basalt; resistant basalt 

 now caps " the Island," and erosion on both sides has given us the 

 ** hill." The sketches shown in Fig. 20, indicate the structure and 

 the different outlines resulting therefrom, so that no further descrip- 

 tion of this group of residuals is necessary. The sketches are mainly 

 ■diagrammatic. 



(d) Mt. Wilson. — This hill presented some difficulties to the 

 writer. In the absence of any accurate and detailed surveys of 

 i^he north part of the Werribee area, every available map that 



