Section of the Shortland I d 



^iiiii^^ 



£ 

 % 



am island of _Alu 



A hflli c/' VoLC€UUC Fvrmatirrt 



j'B Inland ridgqs representing ancient bamrr-reets . The 



(C coral -h.mr.y(<nc ' is hen shewn overlying the sett pberopod 

 deposit . 



!D Present tines or-' 'barrier- reefs m th interior lagoon channels 



E 0i£ i'lnerhtie O has Veen, jtpheaved about a hundred? -feci ul'.v. 

 tiic . Tea . the eater Izne E about fot-tv feet, and hctJi €ve composed 

 ofetiYtlltme.'rtenc The depth of ' the inner laacrn elianrtel is 

 abcubfa-efathtmis, entire- outer channel about twelve fathemis 



Profile of the Barrier-Reef of Choiseul Bay 



The Barrier -Reef of CnorsEUL Bay 



Seaward slope of the Barrier- Reef of Choiseul Bay 

 (cb-arrn on, Ac true, jade to the- hundred fathom line- 1250 yards fivnv edge- ofreefflabj 



