476 
GEOLOGY: W. M. DAVIS 
level atolls are presented in the table below, in which the first column 
gives the letter by which the island, named in the second column, is 
designated in figure 4; the third column gives the page in Gardiner's 
report, and the next two columns the page and the plate in Agassiz' 
report, where descriptions and charts of the atolls may be found. The 
table is arranged with the best preserved atolls, adjoined by sea-level 
fringing reefs, as its first members; with dissected limestone islands 
enclosed by barrier reefs as its middle members; and with two almost- 
atolls and one true atoll as its final members. Columns 6 and 7 give 
the dimensions in miles and the height in feet of the uplifted calcareous 
islands. Columns 8, 9, and 10 give the character of the surrounding 
sea-level reef, its dimensioi^is, and the depth of its lagoon. 
(1) 
LETTER 
(2) 
NAME 
(3) 
GARDI- 
NER 
(4) (5) 
AGASSIZ 
(6) 
DIMEN- 
SIONS 
(7) 
HEIGHT 
(8) 
NEW REEF 
(9) 
DIMEN- 
SIONS 
(10) 
DEPTH 
Vatu Vara 
462 
53 
19 
1030 
fringe 
H X 2 
A 
Naiau 
462 
52 
20 
3^ X 2 
580 
fringe 
4x2^ 
B 
Kambara 
463 
98 
22 
3 x5 
320 
fringe 
2 
Wangava 
461 
66 
22 
li X 3 
290 
fringe 
^x2 
8 
Vanua Vatu 
462 
121 
21 
Hxli 
310 
close br. 
2^ X 3 
2 
C 
Fulanga 
457 
62 
23 
5 x3i 
260 
fringe-br. 
4-5 
D 
Tuvuthd 
462 
51 
20 
3^ X 2 
800 
dose br. 
41 X 3' 
8-9 
E 
Namuka 
461 
57 
22 
4|x U 
260 
barrier 
7|x2i 
11-13 
F 
Ongea 
460 
60 
22 
4 x2 
270 
barrier 
5 x8 
10-13 
1 x2 
300 
G 
Yangasa 
461 
57 
22 
2 xi 
390 
barrier 
9 x5i 
16-19 
1 xi 
210 
\ X f 
270 
Aiwa 
54 
21 
2 x| 
210 
barrier 
9 x3 
18-23 
H 
Oneata 
56 
21 
3 xf 
160 
barrier 
11 x2-5 
18-20 
J 
North Argo 
125 
20 
2X3 
80 
aim. atoll 
5 x9 
18-21 
K 
Reid 
124 
20 
4X8 
50 
aim. atoll 
7 x6 
18-21 
L 
Great Argo 
124 
21 
atoll 
22 X 9 
30-36 
The first seven islands preserve the form of atolls so well that their 
emergence must be of recent, postglacial date, and may have been 
nearly synchronous; but as their altitudes vary greatly, uneven uplift 
and not a fall of ocean level must be appealed to in accounting for their 
emergence. It is noteworthy that all these little-dissected islands are 
surrounded by sea-level reefs of the fringing or close-set barrier type. 
On the other hand, the five following islands, which lie to the eastward 
of the preceding seven, do not present the form of atolls; they are of 
irregular outline in plan and profile; two of them are discontinuous 
groups of small limestone knobs. If any other origin than uplifted 
