﻿278 



BULLETIN 103, UNITED STATES NATIONAL MUSEUM. 



The reefs of the St. Martin Plateau are superposed oji an ante- 

 cedent platform that was brought into its present relations to sea 

 level by geologically Recent submergence to an amount of about 20 

 fathoms. 



65° 



18 



Ii5^ ^« '« '' i^^^-~'^'~^-'™k 



liollers frequently occur / 2il '-'•) H 12 ^j- — 2^ .^,,15 4?.,, A5i{;BGADA 



fromOctober to May / ^. ^i" ••§•• '• li ^^^g^ gfe^^P -v 



110. -'-?-",^ 



..-—'30 35 33 



17 18 ^-^fJio 10 -a'"' 1^5 -^q^ -^ / 



i^'^'i?'] 



V 



23 23 



18 ..-■ 



_ .^aS- , ^'V 680 



101 ~'238\l7/288 ~--- — ._y350 



153 \ 



880 V 



^ 1061 



23 



516 



715 



990 



875 



"^ 1350 



1116 519 



1105 



1230 ^ \ 

 V n95 



990 



l:«7 



695 



1091 

 861 



931 



720 



1C80 999 550 



9 A 



219,fil. 551 



565 1020 1600 „„ ^ ,^ 



1951 i2,5s ™<v '•i'O "^" 10 



ST-CROIX \v^ 



in '. * 8 ^^' IJ 15^ l'^-,-' 

 '^ ''==-^' 13,. .-;■ .'' 



758 765 

 879 

 667 



lj;'SO''325 

 Vl7S 



' --^;;'r -•'I 



18 



65 

 Fig. 13.— Chart of virgin islands and st. croex. From U. S. HYDROGEAtnic chart no. 2318. Scalb, 



ONE INCH=AB0UT 12.8 NAUTICAL MILES. 



ST. CROIX ISLAND. 



This island rises above a bank about 30 miles long and 10 miles 

 wide. The distance from the shore to the 100-fathom curve is usually 



