JciJ-itnl history, since rounding of 

 larger size particles occurs at a rela- 

 bels rapid rale. 



Heavy minerals arc not common 

 |j| the sand, but local concentrations 

 occur at the north end of the beach. 

 Presumably the heavy minerals, trans- 

 ported by Wave and current action. 

 ),-,\c become more concentrated 

 ilicie partly because of the configura- 

 lj Dn nl the coastline; they are 

 prevented from moving northward 

 m the headland of Mount Martha 

 (iniitodiorite which has steep cliffs 

 Hid relatively deep water near-shore. 

 More lhan oO per cent of the heavy 

 mineral assemblage is composed ol 

 Mack opaque oxide particles I mainly 

 magnetite and ilmenite). Tourmaline, 

 /jrcim. leucoxene and biotitc make 

 up most of the remainder. Much of 

 he heavy mineral content has 

 ipnafcntiy been derived from the 

 nearliv granitic rocks, and many of 

 Jlfi grains do not have a high degree 

 of roundness. Magnetite grains fre- 

 yuenlly show edges of crystal faces. 

 «hilc a large number of the zircon 

 unnns arc cuhcdral and subhednil. 

 and tourmaline nccurs commonly as 

 ptivmalie crystals showing only slight 

 .htasion Some grains of zircon. 



lorn m.ilinc, tutile and ilmenite are 

 rounded and well-rounded, and appar- 

 ently have experienced B longer dct- 

 tilal history: they mas have come 

 frxnn the Tertiary sandstones exposed 

 in cn.tvtol cblls W the north. 



I he fact thai the sandy shore at 

 Safety Beach is relatively stable, and 

 that coastal erosion docs not piuscul 

 great problems, make the locality 

 popular and seenieally attractive. 

 There is plenty ot material availnhlc 

 10 nourish the beach at all limes. It 

 is clear that the Mount Martha 

 Granodiontc is an important source 

 rock for the beach sand. 



Rl FI RENCt •> 

 Baker, G . 1938. Daeitcs and associated 



rocks al Arthur's Seat. Oramona. 



Pwv. I&a S,h: Via. SO: 258-2-% 

 Beaslcv. A. W.. Bottom sediments 



of Port Phillip Bav Man. W»< WWj 



t ffl 27: t.9-105 

 , 1969. Beach sands of the 



southern shore of Port Phillip Bav, 



Victoria. Man Mot- Mo*. Via 29: 



t-:i. 



Kchlc. R. A , l«jO. The Ma istop 



Peninsula. Man va4. Sun Via. 17: 

 1-84. 



Irask P D.. 1V3Z. QrWn ><>ut aniron- 

 wail oi umn-c l«ffm«»to of pttfO' 

 la,m. Gulf. Houston 



Wit R\l HISTORY MEUA1 I ION 



\: the Noventhuf meeting, the award of this Medallion 10 Mr. Cliff Realise 

 /will be nuUc by Mr A, Dunbavin Butcher Chan nun ot tin Natural Histoiy 

 ilallion Awarii Committee. 



Mi. Bcaugleholc will speak on -The I vest Gippslaml Horn 



Gciffifjg) Group I vcmso.i 



W fdncv.bv. 5 Novcmbet. x p m. 

 Cclob^, W71 



