Palaeozoic Geology of Victoria. 



107 



iern boidtr is less sharply marked off from the coastal plain than 

 usual. Hard roc-ks of a varied nature have controlled lar<j:ely the 

 main irregularities of the present surface, and the principal feature 

 is the lara Range, wliich runs ohli(iuely across the area in a N.N.E. 

 direction. Starting towards the S.W. corner of the map, at Mount 

 Nowa Nowa (about 1100 feet), the range continues as a rocky forest 

 clad ridge to the N.N.E., rising in Mt. Tara to nearly 2000 feet. 

 The rockii composing it consist of quartz porphyrite and Upper 

 Ordovician slates and sandstones. 



Th€| most important streams are Boggy Creek and its tributary. 

 Yellow Water Holes Creek. Tlie former enters the liead of Lake 

 Tyers at the township of Nowa Nowa, after passing for several miles 

 Ihrough a rocky gorge entrenched in the Porphyry Series, and ex- 

 posing some of the best sections to be seen in this area. A few of the 

 gullies on eitlier slope of the Tara Range also provide some good 

 exposures, but most of the area is covered with the scrub and forest, 

 and the relationship and boundaries of the rock formations are 

 rathei- difficult to follow. The task of mapping several portions Avas 

 further hampered by the want of maps of any kind! The sketch 



Map 5 





iffvre/ dtpm 



lU TERTIARY 



HI LOWER DEVONIAN ESS23 UPPER ORDOVICIAN 



Scale; 



