Deep Cores of Oahu — S tearns and Chamberlain 
163 
TABLE 2 ( Continued ) 
Description of Core from Ewa No. 2 Hole 
DEPTH 
(in feet) 
ROCK TYPE 
DESCRIPTIVE NOTES 
290-294 
Brown mud 
Brown basaltic mud. 
294-297 
Fine Sand 
Brown basaltic sand and mud. 
297-300 
Brown mud 
Brown basaltic mud. 
300-301 
Brown sand 
Brown basaltic sand showing %-inch and %-inch layers of 
coarse and fine sand. 
301-307 
Brown mud 
Brown basaltic mud. 
307-310 
Fine sand 
Brown basaltic sand and mud. 
310-326 
Brown mud 
Brown basaltic mud, very mottled starting at 328 ft. Much 
limonitic from 333 to 334 ft along fractures. 
326-330 
Brown sand 
Basaltic sand and silt much weathered. 
330-339 
Brown mud 
Brown laminated mud. 
339-344 
Brown sand 
Brown calcareous (secondary) sand, in places indurated with 
lime. 
344-381 
Brown silt and mud 
Brown silt with soil structures in places. 
381-400 
White and gray marl 
Mottled gray, white, and brown mud. Contains oyster shells 
and lime nodules. 
400-415 
Brown limestone 
Recrystallized reef. At 405 ft 3 inches of brown mud mixed 
with coral fragments. 
415-418 
Brown marl and 
limestone 
Fragments of recrystallized reef mixed with brown mud. 
418-420 
Brown and gray marl 
Fragments of limestone mixed with brown and gray clay. 
420-425 
Gray limestone 
Large fragments of limestone, probably recrystallized reef, 
oyster shells, etc., mixed with some gray and brown mud 
between 420 and 423 ft. At 423-425 ft large sections of 
limestone. 
425-428 
Gray-brown marl 
428-438 
Brown mud (soil) 
Plastic brown silty clay. 
438-447 
Gray marl 
At 443 ft a 4-inch layer of red soil. 
447-462 
Brown mud (soil) 
Stratified; soil structure contains well weathered basalt pebbles. 
462-486 
Brown muddy sand 
At 467-469 ft and at other depths nearly pure coarse medium 
basaltic sand; remainder of section muddy sand; at 483-486 
ft no sand, just brown mud. 
486-499 
Brown gray marl 
Oyster shells abundant. The core from 487 to 498 ft was lost in 
a drilling mishap, but the cores at 487 and 498 ft were of 
the same lithology, and so possibly the missing 11 ft are also 
brown gray marl. 
499-504 
Brown silty mud 
504-517 
Red basaltic, 
Numerous highly weathered basalt cobbles; e.g., at 508, 510, 
residual soil 
511, 512 ft, all about 4-6 inches. At 513 to 514.5 ft one 
large pahoehoe boulder IV 2 ft in diameter was cored. From 
about 515 ft the soil grades imperceptibly into soft weathered 
aa basalt. 
517-535 
aa basalt 
At 517 ft rotten aa basalt; no distinct upper surface; grades 
continually into soil above. From about 518 ft blue weathered 
aa basalt; large elongated vesicles. 
535-542 
aa clinker (soil) ? 
Weathered aa clinker, lower portion highly weathered into soil 
structures. 
542-544 
aa basalt 
Blue; fractured, somewhat weathered aa basalt. 
