Geology of Lily dale. 333^ 



Stratigraphirdl ( '/as.<ip'r(ff/o/i .—The mcks of tlie- district fall into 

 four groups : — 



1. A sedinientai-v series of tlie Upper Silurian epoch. 



2. An igneous series of the Later Palaeozoic { ?) period. 

 •'). An igneous series of the Early Tertiary (?) period. 

 4. An alluvial series. Recent. 



III. -The Upper Silurian Sediments. 



Prof. Gregoiy ( lU) sulxliviiUd the Silurian of Victoria into a Lower 

 or Melbournian Series, and an Upper or Yeringian Series. The 

 Lilydale Silurians belong to. and form the type deposits of, the 

 Upper Silurian, whirh were ealled Yeringian. after the parish 

 where Lilydale is situated. 



Between .Melhouiiic and Warlnirton. the Silurians are apparently 

 folded into two great synilines. In one of these, ealled by Prof. 

 Gregory. " tlie Lilydale Synclinal."" the Upper Silurians of the- 

 area untk'i- i-eview iiavc been pieserved. This great syncline- 

 extends from the Waiiandyte anticline on the west, through Lily 

 dale and Yering. to th^ Woori Yallock basin on the east. 



Lithological C /i a racfers.— The Yeringians are marine deposits, 

 whose character varies with increasing distance from the old Silu- 

 rian shore line. They vary Ijetween the conglomerates of Cave Hill, 

 the sandstones and quaitzites of Gruyere. the limestones of Mr. 

 Mitchell's quarry, and the uiudstones and shales of Mooroolbaik 

 and other places. 



The Limestones. — There are two outcro|)s of limestone at Cave 

 Hill, the one an occurrence about 80 yards square in Mr. Mitchell'*- 

 quarry, the other a small outcrop al)out 4 feet s(iuare in the rail- 

 way cutting, about ."'tdd yards south of the quarry. The well-foinied 

 strata of the quarry di]) tast (8) at about 50 deg.. and strike a few 

 degrees east of north. Their eastern limit is determined by a thick 

 bed of quartzite. wiiich overlies them conforirial)ly. Their westein 

 limit is concealed undei- an overburden of basalt. (Plate XXX. ^ 

 Fig. 1.) 



This limestone formation has been incompletely deseribed by 

 Sir A. R. C. Selwyn (1). R. A. F. Murray (7). A. W. Cresswell 

 (2, 3. 4). and V. R. Stirling (8). Its abundant fossiliferous con 

 tents have been investigated by Sir F. McCoy, R. Ethridge. jun. ; 

 G. B. Pritchard, F. Chapman, and A. W. Cresswell. 



Sir F. McCoy referred them to the Upper Silurian on palfeonto- 

 logical evidence (7). 



