rupul which, across the top of ihe 

 lOuSC M00k must have plucked n out. 

 Ihc sue is on the landward suit: of 

 .1 Incak in a rampart originally 

 formed hy the same major joml plane. 

 I he sea forced through this channel 

 id high speed could easily suck out 

 this block in spite of its weight. 



that Ihc hloek was rcmoveil by the 

 sea nul l0tl£ belore the photograph 

 was taken is shown by the lacl thai 

 Ihc hollow had not been filled in, the 

 edges of the rocks were sharp, and 

 Ihc bk>ck removed wuis not far away. 

 However, sonic ol the very nunieious 

 marine gastropods t AMiuyi/j/ki) 

 fouud on the platlorni hail ciawled 

 into the cavity, as the phoiogtaph 

 shows. In other places, similar 

 removal of loose blocks where con- 

 verging joint planes free them, has 

 been noticed A week afiei ihc photo 

 graph was taken, the site was visited 

 again bin .storm had swept the area 

 in the meantime. Wit block had been 

 swept shorcwards and was. almost at 

 ihc cl.ri. a distance ol over a chain, 

 I though! at first that some youth 

 had hurled it there, but noted thai 

 there were no clippings or hruisings 



on i'. Moreover, such a peison muhIi| 

 almost certainly have thrown it info 

 Ihe sea nearby to make n spho,. 

 Such blocks swept by forceful \v nteis 

 HCfOSS fjje plaifoim would act as i 

 njltUTBl plane to leduee ihc Sur&Vjrjj 

 of the rock 



The wedge of rock just descnW 

 weighed JtJ paundi II five sUfifi 

 rivks were ic moved, each yeai Iron' 

 ibe platform at Point Stint, and tins 

 eonlinued KM the past 6.000 \ c ai s 

 1 1 1 1 1 m t • which die sea has been al mi 

 near iis present level, then some MM) 

 tons would have been renuued by 

 Ibis pioeess. finis although the pm- 

 cess is a minor one. plucking is not 

 without significance in the mliKijor 

 of rocky coasts bv marine erosion 

 I his lirNt attempt ai i|u.miilieat'Oi 

 suggests thai "I the ordei of (MIO tons 

 of rock have hevn removed by this 

 process from a typical exposed ht.nl- 

 latid during ihe piescul phase p] 

 erosion, 



Km I hi St I s 

 tidwaids, A ft , fJM. Wave jciinn m 



shore pl.t. form formation. Qevi, \lu; 



88: 41-49. 

 (..ill. R LV. I'>7| k. imparts on gfcOR 



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