[Proc. Roy. Soc. Victoria, 21 (N.S.), Pt. I., lOOS]. 



Akt. II. — Tlie Siluridn Rocks of the Whittlesea 

 District. 



By J. T. JUTSON. 



With an Appkndix on the Fossils Collkcted, 

 BY F. Chapman, A.L.S., Etc. 



(With Plates III., IV.). 



[Read 12th March, 1908.] 



Introduction. 



The area dealt with in this paper is the whole of that com- 

 prised in the Geological Survey Quarter Sheet 3 S.E., the 

 southerly portion of Quarter Sheet 3 N.E., and the northerly 

 portion of Quarter Sheet 2 N.E. Whittlesea is the most central 

 township of this district. 



This block of country has the granitic rocks of M Rint Disap- 

 pointment in the north, and basaltic rocks in the south-west ; 

 but Silurian rocks form the major portion, and it is with them 

 only that this paper is concerned. The contour of the Silurian 

 area has the usual undulating appearance of Silurian ct^untry of 

 moderate altitude in Victoria. 



PRE^^aus Work. 



This appears to have been restricted to the mapping many 

 years ago by the old Geological Survey^ ; to the determination 

 by the late Prof. McCoy2 of some of the fossils collected by the 

 Sun-ey ; and to some records by Mr. Chapman from near the Yan 

 Yean^. The work of the field surveyors determined the boun- 

 daries very accurately of the various geological formations ; and 



1 Qu.irter Sheets, 3 S.E. and 3 N.E., by Norman Ta.vlor,1857 and 185S. Quarter Sheet 

 2 N.E., by Robert Etheridge, Jr., 1S68. 



2 Prod. Pal. Vic, Decades v. and vi. and Q>iarter Sheet 3 N E. List of fossils from Hb. 1.5, 

 16, 17. 



3 Vic. Nat., vol. xx., 1904, p. IG.^i. 



15a 



