290 



Charles Fenner : 



hidden there ^ve may adopt two dififerent methods, according to 

 ihe nature of the basalt distribution : — 



(1) If the basalt is discontinuous, occurring in long tongues, 



it may and practically always does mark the course of 

 an ancient valley. 



(2) If the basalt is a wide sheet, we may search in our present 



river gorges and cuttings for exposed sections of tlie 



buried valleys. 

 The first method is very simple, and many references have already 

 been made in this paper to the old valleys thus disclosed. These 

 instances will be briefly recapitulated, with reference to Fig. 35, 

 and some fresh cases added./ 



It may be stated that a lava flow, now almost destroyed, accom- 

 panied the upper part of the present Werribee, at least to a point 

 parallel with Egan's Hill. Thus the upper Werribee was also the 

 site of a pre-basaltic valley. While the basalt referred to in this 

 paragraph, as well as much of that towards the village of Kor- 

 weinguboora, is usually regarded as belonging to the '* newer 



I a. developed prior ro Newer Volcanic penod^^^^-T 

 b. •>■> since >» J» '» ••..•■■ 



,C.c(owb^FuI •^.— - 



Ancient river courses 

 (prf-Mfwtr Volcanic) 



ia.sHll persisl 

 b.demons^r.'^ 

 C.sotggesfcd 



rral-cd ^ -*• -^ 



Fig. 35.- Plan showing the present and pre-uewer basaltic streams 

 of the central portion of the Werribee area, with other details 

 concerning same. 



