CHAP. IV.] ST. THOMAS TO BERMUDAS. 297 
terest, where there are 
only a few inches to come 
and go upon, in the ques- | 
tion of the entrance of | in 
a vessel of a certain \ | | 
draught. \ | 
Perhaps even a more A | | 
i NN 
satisfactory proof of sub- NN 
: Nv 
sidence was given a few Nv 
| Vi. 
years ago. In preparing Nw | 
Ne o | 
a bed for the great float- \% ie 
. . ° Tine 
ing-dock, it was necessary a \5 § 
. . NS His } 
to make an excavation in N= lon z 
NS IC Na 
the Camber extending to S \e ie Ne 
fe) i 
a depth of fifty feet below 5 i ne 
low water. First they \G HE 
came, in the cutting, at a \N ii a 
depth of twenty-five feet Ss | 
below the surface, to a 
bed of calcareous mud, 
five feet thick, forming 
the floor of the basin; 
next, to loose beds, twen- 
ty feet thick, of what has 
been called ‘ coral-crust ” 
—coral-sand mixed with 
detached masses of 7- 
ploria and isolated exam- 
‘supntudag ‘pUuv[s] PUL[alT SPOP-suIJvOLT ay} 1OJ pog ay Sueanoxa ut pasodxa woyo99g—"}) ‘OV 
ples of smaller corals and 
of many shells, and pass- 
ing into freestone, the 
coral-sand cemented to- 
gether, but somewhat 
loosely coherent. Be- 
VM: 
MADE ||| C: 
UA 
