Geology of the Loiver Mitchell River. 13 



(4) Notes on Miocene Strata at Jemmy's Point, and 



(5) Appendix to remarks on " The Older Tertiary Strata at 

 Bairnsdale," by J. Denuant.^ 



(6) The Miocene Strata of the Gippsland Lakes' Area, by 

 Dennant and Clark." 



In the last mentioned paper certain ferruginous beds at Boggy 

 Creek and elsewhere on the Mitchell River were briefly referred 

 to, and in a footnote it was stated that from an examination of 

 their fossil contents they have been determined as miocene. A 

 detailed study of the material since gathered from various 

 outcrops on the river bank proves, however, that this statement 

 is only partially correct. For a short distance from Bairnsdale 

 the beds are undoubtedly miocene, but higher up the river the 

 fossil casts in the ironstone represent, as we shall presently see, 

 an older fauna. 



These fossiliferous ironstones form a marked feature of the 

 Mitchell River banks, and the main purpose of the present paper 

 is to describe them and refer them to their proper location in the 

 tertiary series. They have been generally alluded to in the past 

 as a deposit of uniform age which it was supposed had filled in 

 an excavated area at the contact of the Bairnsdale limestones 

 and the Avon sandstones. We, however, separate them into two 

 main divisions, one of which is miocene, and a westerly extension 

 of the Jemmy's Point beds, and the other earlier, and contem- 

 poraneous with the eocene limestones and shell beds of the 

 river banks. 



Another deposit which claims attention is the well known 

 pebble drift or conglomerate. In the bed of the river, on 

 its banks, in road and railway cuttings, it is everywhere pre- 

 valent. Its origin and the mode of its distribution will be 

 referred to as the various sections come under review. 



II. — Surface Configuration of Area. 



Under this heading the leading features of the valley of the 

 Mitchell from Iguana Creek to the mouth of the river are 

 outlined . 



1 Proc. Roy Soc. Vict., vol. iii., n.s., 1891. 

 '2 Proc. Roy. Soc. Vict, vol. x., n.s., 1898. 



