748 
Notomya, 695. 
Nucula abrupta, 698. 
concinna, 699. 
divaricata, 725. 
glendonensis, 699. 
impressa, 726. 
Nukunono, 407. 
Nullipores on the margins of reefs, 37, 57, 
58, 73, 101. 
Oahu, account of, 233. 
rivers of, 234. 
Pali or precipice, 235, 258. 
view from Kaneohe, of precipice, 236. 
valleys of, 236, 385, 388. 
tufa craters of, 237, 240. 
structure and dip of layers, 238, 
rocks of, 238. 
caverns of, 239, 253. 
columnar forms of rocks, 239. 
Diamond Hill, 240. 
Punchbowl, 242. 
Koko Head craters, 243. 
salt lake region, 245, 
craters of Kaneohe Point, 248, 
Kaala Mountains, 250. 
coral reef rock, elevated, 251. 
coral chalk of, 150, 252, 781. 
coral sand rock, 45, 253, 
! 
general review of geological history of, 
256. 
twin character of, 257. 
eastern mountain latest in eruption, 
260. 
early level of, 412. 
Oatafu, 407. 
Ocean, Pacific, see Pacific. 
Oceanic basins, a result of contraction, 428, 
430, 436. 
Ofu, 309. 
Okatutaia, 404. 
Olosenga, 209. 
Oolitic rocks, at Nassau Bay, 604. 
constitute San Lorenzo, 597. 
Oregon, general features of, 611, 613. 
dryness of climate, 621. 
Cascade Range, 614. 
| 
| 
\ 
INDEX. 
| Oregon, Coast Range, 615. 
Swalalahos, a volcanic peak, 615, 643. 
Blue Mountains, 616. 
Grand Rond, 616, 
Grande Coulée, 624, 674. 
geological structure of, 625. 
minerals of, 637. 
fossils from, 657, 722. 
terraces in, 659, 670. 
submerged forest of the Columbia, 67 4. 
causes of features of, 668. 
Orthonota costata, 692. 
Osnaburgh Island, 285. 
elevation of, 403. 
Otahaa (Tahaa), 285, 304. 
Otaheite, see 7Tuhiiz. 
Otuhu, 70. 
Ovalau, one of the Feejee Islands, 342. 
Owhyce, see faiwavt. 
Pacific Ocean, extent of, 9. 
subdivisions of, 11. 
gencral features of, and arrange- 
ment of land, 10, 11, 414. 
geological agencies in, 26. 
tides of, 26. 
coral islands, number and extent 
of, 24. 
see farther, Coral. 
distribution of coral reefs 
islands in, 134, 137, 395. 
review of volcanic action in, 353, 
encircled by ranges of volcanoes, 
430. 
origin of the constitution of the 
basaltic islands of, 372. 
origin of the valleys of islands, 
379. 
origin of general features of, 424. 
on changes of level in, 392, 402, 
Al 
subsidence in, indicated by coral 
reefs, 393, 394, 
extent of, 399. 
period of, 401. 
loss of land to, by subsidence, 
400. 
and 
