Physiography of Werrihee Area. 257' 



detail by Professor Skeats (ref. 46). A Ioav and irregular granitic 

 ridge continues from the You Yangs to the Anakies, and forms the- 

 southern boundary of the Little River basin. 



Fig. 19. — Contour of the granitic monadnock of the You Yangs, as 

 seen from the South-East or North-West, true scale, projected 

 from the contours of the Commonwealth Military Survey. 



(b) The Anakies. — These are only in part residual in origin,, 

 since the most impressive portion of the group known as the 

 Anakies consists of high accumulations of volcanic materials. The 

 group loses in impressiveness from its position on the lower of two 

 neighbouring blocks of country. 



The early recorded name of the Anakies was Anaki or 

 Anikai) You-wan. As the latter part of the parallel names was 

 retained for the You Yangs, so has the first part of the name of 

 this group come to be the generally accepted one. The granite 

 portion of the Anakies is less than 1000 feet in height, and shows 

 some fine large granite tors. Like the You Yangs, this hill was 

 undoubtedly a monadnock on the ancient peneplain. No similar 

 granites occur in any other j^art of the Werribee River area, as 

 far as known. This granite appears to be much. more resistant to 

 erosion than are the granodiorites of the Werribee Gorge and 

 elsewhere. 



(c) Trig Hill, etc. — Here we may include a number of lesser hills; 

 that have been formed by the dissection following the recent 

 uplifts. They are therefore very much younger features than the 

 You Yangs and Anakies, having their origin subsequent to the 

 newer volcanic period. A number of such hills occur, nearly all 

 of them in the Ballan Plateau. Structurally, they show great 

 variety, and provide interesting examples of differential erosion. 



Among them we may specially mention Trig Hill, Pentland 

 Hills, and " the Lsland " — all of which, are due to the great valleys 

 carved by the Werribee and Myrniong. Their tops are really por- 

 tion of the fairly level block of the Ballarat Plateau. Trig Hill 

 (sometimes known as Table Top), an important trigonometrical 

 point, is well known to those who travel by rail through Bacchus 

 Marsh. It stands on the left bank of the Werribee, about a mile 

 above the point where the Koi-kuperrimul enters that stream. As: 

 will be seen from the sketch it has a complex structure of older 

 basalt, tertiary l)eds, and newci- basalt, the influence of each forma- 

 tion being shown in the varying slopes. 



