hntotl ^ trcnied with dilute 1 : 2 

 (nJnvhlorn. -iciJ to determine the 

 u'right percentage of acid -soluble 

 iriuialy carbonate) material in oath 



(flJjjjIC. 



jhe sand troni Mimptmy station I 

 H |hf northern end of Safety Beach, 

 jdjauciU to coastal i I f s uf decom- 

 posed "soft" granodioritc, is relatively 

 cuarsc. having a median grain size 

 m o.S3 mm. At station 2, midway 

 dlonn 'he beach, the median grain 

 mzcms O.fib mm. and at station 3 il is 

 (,55 mm. 1 bus. there is a continuous 

 .Increase in median gram M/e south- 

 ward along Safety Beach. The 

 ilocrca.se from station I h> station 2 

 is particularly great, hul that Irom 

 nation 2 to station J is less great, 

 tin-, indicates that appreciable south- 



ng|d itrift of the larger sized par- 

 ticles does nol occur. 



\dopling Tr.isks ( \>)M) dassiliea- 

 -um, the sand al station I shows only 

 moderate sorting, having a sorting 

 coefficient ol 2 5f>. Sorting impiovcs 

 markedly along the shore away from 

 1l\c cliffs of decomposed granodmr- 

 jfec At station 2 the sorting coefficient 

 H 1.20. and it is very similar i namely, 

 i 27) at station 3. The marked 

 improvement from station I to station 

 :. mucins that the direction of drift 

 there is south west along the shore 



In the histograms, weight pciceiit 

 age ot material greater than 4 mm in 

 sic is indicated by vertical lines, 

 .nee it represents material retained 

 an the coarsest sieve used. 'Die sand 

 Ifnm station I is bimodal hut the 

 •iihcr two are unimodal. Sand from 

 station 1 has a primary mode in the 

 a-r\ coarse s;md size-grade and a 

 lesser mode in the line sand. Its large 

 . s.mkV.iv maximum and \jm-ad mdi 

 wfc tin immature condition ol soil 

 ine. 'Iwc sourees for this s.and ftit 

 invested by Ihc nature of die hislo 

 /r„m; there appears to he loading. 



0ttobe», 1971 



■A illi coaisc iii.ilenal supplied floili the 

 ticarln graintdiorilc. A vci\ couspicu- 

 ous maximum size giade occurs in 

 the coarse sand giadc of the samples 

 from xtaiions 2 and 3. and fine 

 proximate admixture exceeds coarse 

 proximate admixture in both ot them 

 I he weight percentage of actd- 

 soluble material in the sand nt 

 stations I. 2 and l is 0.4 per cent. 

 0.4 per cent and 0.5 per cent. Tfifc 

 very low content contrasts with that 

 of the sands west of Dromana (Beas- 

 ley I'W) which have a relatively 

 high content of acid-soluble material. 

 MicCQ£G0pic examination indicates 

 that whole shells and shell fragments 

 made up almost all of the acid- 

 soluhlc content, and that this material 

 is present mainly in the coarser si/.c- 

 tructions ol ihe sand. It seems to 

 have come mainly from organisms 

 indigenous to the ncarhv seafloor 



fragments of granilie rock anil 

 hornlcb. oeci't in the sand at .station 

 I Apparently they have come from 

 local sources: hornfeK occurs anniiRl 

 the Mount Martha Ciranodionte a- 

 well as at The Rocks. Dromana 

 (Baker l?38| Keble 195$) Much ol 

 the granitic rock is of pebble size 

 but * the fragments tange down 

 through gtanule to coarse sand si/e: 

 most of the -.mailer tragmems eshibn 

 a fairly low dega-e of roundness and 

 n is clear that they have not been 

 subiected to much li asportation 

 The amount of grannie rock at 

 stations 2 and 3 is considerably less 

 than at station I. 



The Safety Beach sand consist* 

 mainly of quartz. Most of the quart/ 

 grams aie colourless and subangular 

 to Mibrounded Small amounts ol 

 , T ique reef quartz occur, and feld- 

 ,p..r pariides are relativclv common 

 at sTtatuni I Snme of the quart/ 

 erainv m the coarser vi/e ft actions 

 a.e angular, this points tu a short 



293 



