54 A. E. Verrill—The Bermuda Islands; Geology. 
the point on the west side of Clarence Cove.” Such variations do 
not exist at sea, a few miles from the islands.* 
Besides the main cone and crater, which form the foundation of 
the Bermuda Islands and reefs, there were two smaller connected 
peaks or side-cones, which le a few miles to the southwest of Ber- 
be Sabet aby 224.4 jmile = 
rAd 20 ral 00 
100 7 
57 
460 
S60 
pnd 
3 
rs) 
= 
= 1240 
370 
SeaLevel imile § of io a 
a ae) “a ae 65° oe 
Ae 7 * a 
0 : 
SS > 5 90. 1950 * ~$ a is 
<a ‘ AG, ] 5 y = 
22 S| bee 
IV 
770 
gv 
3 miles 
—— 
Figure 7.—I. Sectional diagram of submerged slope northward from North 
Rocks (N). 
II. The same southward from Castle Harbor (C). 
III. Sketch map showing the situation of Argus Bank (A); Challenger Bank 
(C); and southwestern end of the Bermudas; Somerset Island (S); Ireland 
Island (I); Main Island or Bermuda (B. I.); Hamilton town (H); a, 0, line of 
the section shown in IV. 
IV. Section through Somerset Island (S), Challenger Bank (C), and Argus 
Bank (A), along the line a, b, in III. 
All soundings are given in fathoms. (Altered slightly from A. Agassiz.) 
muda, and form what are known as Argus Bank and Challenger 
Bank, both having, in general, from 20 to 40 fathoms of water over 
their surfaces, but Argus Bank rises in one place to within 8 fathoms 
of the surface of the sea. (See fig. 7.) 
* See ‘‘ Voyage of the Challenger,”’ Narrative, i, p. 140. 
