Palaeozoic Geology of Victoria. 89 



30 chains south from its junction witli the Dolodrook (Loc. F.). In 

 all these instances, conformity of strike and similarity of dip are 

 shown, but the horizontal extent of the exposure is limited, and 

 when the general boundaries of the contiguous formations are 

 traced the evidence in favour of an unconfonnity is more marked. 

 The lithological break is a sharp one in every case, and the 

 graptolites are abundant in the slates to the junction when they stop 

 suddenly. 



Unfortunately, no distinctive fossils definitely recognisable as 

 Silurian were obtained, but a grit containing crinoid impressions 

 was noted at Locality D, and a similar crinoid bearing grit Avas 

 noted in the Dolodrook valley close to the outer boundary of the 

 Ordovician, confirming the ge-anticlinal interpretation of the 

 structure. 



Mr. Chapman states that the material, though not conclusive, is 

 lithologically similar to fossiliferous grits of Silurian age collected 

 by Mr. Whitelaw in the Wood's Point Belt, where they bear a 

 similar relation to the underlying slates. 



This series is of great extent, wrapping round tlie Ordovician 

 and older rocks, and forming a Avide area of hill country. 



From its furthest limit, in the north of the Carey River, where 

 it disappears under the Upper Palaeozoic rocks, soutliAvards to the 

 vicinity of Glenmaggie, where it passes under the Tertiary plains, 

 is a distance of more than thirty miles in a straight line. 



It is the outer zone or ring of the complex Lower Palaeozoic inlier 

 and the Upper Palaeozoic cover is found continuously along its 

 eastern limits, approximating to the Avon watershed. 



On the west denudation has been more effective, so that the Upper 

 Palaeozoic over-mass is wanting between Hickey's Creek and the 

 plains, a distance of about twelve miles. 



The rocks, therefore, regarded as Silurian, can thus be traced 

 continuously to the Macallister Valley to the south of Hickey's 

 Creek, and thence westerly to the Wood's Point-Walhalla zone, in- 

 cluded in tlie surveys of Messrs. Whitelaw and Baragwanath, re- 

 spectively. 



Within the area mapped several of the prominent elevated points 

 ri.sing to well over .'50U0 feet, are due to the superior resistance to 

 weathering of some of the hard quartzitic sandstone of this series. 

 The three most conspicuous and noteworthy are Mts. Hump, Mar- 

 garet and Ronald. 



Uppei? Palaeozoic.' — Th« rocks here considered form a portion of 



