596 



Charles Fenner.- 



highest early tertiarv valleys thus formed in Victoria. Similar 

 basalt occurs on Mt. Howitt, V)ut here the underlying rock consists 

 of purple nuidstone. The rivers on either side of Mt. Buller at 



MT-BULL&R z^-^- 



Fio-. S. — Diagraininaticj section from North to South through ^It. Biiller 

 (6911 feet). 



present flow in valleys 4000 feet below the old valley preserved under 

 the Older Basalt. Since the latter rocks occur in conjunction with 

 fossiliferous beds otherwhere in Victoria, the fact may form tlie l)asis' 

 for some estimation of the amount of erosion in tertiary times. 

 Similar evidence occurs at the Dargo High Plains. Mt. Feathertop, 

 etc. 



(j) Mt. Timhertoj). — This mountain, nearer Mansfield and more- 

 easily accessible than Buller, has a somewhat complex structure. 

 (Fig. 9.) Its table-top is a long, narrow outlier of level-ljedded. 



Fig- 9. — biat4raniniatio sections sliowini^ structure of Mt. Timhert(->p. 



coarse sandstones. The summit is 1600 ft. lower than that of Mt. 

 Buller, and since it is of easily weathered material, it will not be 

 long, " as the earth views time," before the sandstones will have 

 disappeared from Timl)ertop, as they have done furthi'r along the 

 ridge, exposing tlie more resistant underlying volcanics. 



V. Other- Features. 



{(I) Barjarfi nap. (See Fig. lO.). — This outline sketch is suffi- 

 cient to show that the gap is a very important one. Summers! 



(ieolot,'}- Proposed Nillahcootiu Water Conservation Area. Proc. Roy. Society Victoria, 1908. 



