80 
Journal of the 
Tlie general geological features of tlie neighbourhood may be 
briefly stated, and are illustrated by the subjoined diagram 
section. 
Diagram Section near Bulgobacic and Granite Creeks. 
(a) . Lower palaeozoic (silurian.) 
(b) . Granites and quartz diorites. 
(c) . Intrusive dykes. 
The oldest rocks of the district are the auriferous quartz-bearing 
slates, and sand-stones of the North Gippsland goldfields. No 
fossiliferous beds have been met with in this locality, but judging 
of these rocks by their resemblance to other similar formations in 
the district of known geological age, by their relations to younger 
formations in the neighbourhood, whose age is fixed by paheonto- 
logical evidence, and by the general geological structure of North 
Gippsland, they may be referred with some confidence to the 
Silurian age. At any rate, so far as the present evidence goes, 
they are certainly older than the Middle Devonian formations of 
Tabberabbera, and I suspect that the latter group may be found 
to extend to one of tlie lateral valleys in the west side of 
Cobbannah Creek. 
It is clearly to be seen, in all parts of North Gippsland, that 
the Silurian formations have either been regionally metamorphosed 
in situ , or that their highly tilted strata have been cut off by 
intrusive granitoid rocks, most irregularly both in their dip and 
strike. Where the strata are found to end against these igneous 
rocks, they not only dip from them, but also end abruptly against 
them. In examining the planes of contact, evidences of force are 
to be observed along them in the broken and disjointed or 
crumpled condition of the sediments. A metamorphosed zone 
surrounds the surface contacts of these granitic masses. This 
surface zone is evidently a section of the mantle of metamorphosed 
rocks which enveloped the whole intrusive mass; a metamorpliic 
