A. E. Verrill—The Bermuda Islands; Geology. 89 
sound inside of Mills Breaker (ce, map II). These deeper places, more 
than 45 feet deep, are mostly imdicated by ruled lines on map I, 
fig. 12 (p. 92). A few of the smaller ones, less than two square 
miles in area, omitted on map I, are shown on map II, pl. xxxvii. 
If the land were reélevated to the height of 45 feet above its 
present level, all these areas would become enclosed sounds, like 
Harrington Sound. Very likely the tides and waves would soon 
clear the mud and debris out of their old channels, so that most of 
them would communicate with the outer waters by narrow channels, 
thus coming to resemble Castle Harbor, Great Sound, Elies Harbor, 
etc. But some would remain for a long time land-locked, unless the 
waters have unknown subterranean passages. The deeper part of 
Great Sound would thus form a completely land-locked sound, two 
square miles or more in area, and about 15 feet deep (VI on map I). 
It would resemble Harrington Sound in size and form. There would 
also be a much smaller area of water, about 10 to 20 feet deep, in 
the center of Harrington Sound. 
All these sounds that would be left, after such reélevation of 45 
feet, would amount to about 40 square miles, but the dry land 
regained would be about 160 square miles, or about eight times the , 
present area of the dry land. 
The largest of the residual sounds would be that including part of 
Murray Anchorage and the longer and deeper North Rock Sound, 
now connected with the former by a channel of 8 fathoms depth. 
This sound would be about as large as all the present land of Ber- 
muda, including Castle Harbor and Harrington Sound. Three other 
sounds without visible outlets (II, III, and V), each about the size of 
Harrington Sound, would remain. Another, similar in size to St. 
George’s Harbor, is marked II on map I. 
Again, if the reélevation should amount to about 50 feet, the 
total area of dry land gained would amount to about 190 square 
miles, and the only bodies of water, of any notable size, that would 
remain are indicated by the heavy dotted or broken lines on map II. 
They would amount to about 12 to 14 square miles. All the flats, 
and the rest of the reef areas and great interior lagoons, would be 
laid bare. The pinnacles and cliffs exposed would be, on the lower 
lands, 45 to 50 feet high. 
The largest sound that would now remain is the North Rock and 
Mills Breaker Sound (eon map IT), which would have an area of 6 or 
7 square miles, with depths of 16 to 22 feet in some small areas, but 
most of it would be only 4 to 10 feet deep. A small, irregular, 
