162 
PACIFIC SCIENCE, Vol. XXI, April 1967 
TABLE 2 
Description of Core from Ewa No. 2 Hole 
DEPTH 
(in feet) 
ROCK TYPE 
DESCRIPTIVE NOTES 
0-10 
Artificial fill 
Crushed blue basalt and coral fill for drill platform. 
10-18.8 
Calcareous soil 
Tan calcareous muddy soil with secondary calcified lumps. 
18.8-36.5 
Brown sandy soil 
Chiefly basaltic grains; a few pebbles of basalt inch across. 
Some secondary calcite nodules. Changes to plastic brown 
clay downward. 
36.5-46 
Gray marl 
Lumps of lime and concretions in gray mud ; probably weathered 
surface of underlying reef. 
46-102 
Reef limestone 
Hard reef limestone with shell molds, much recrystallized. 
102-118 
Reef detritus 
Reef limestone with red mud in the interstices to 111 ft, and 
then changes to gray mud. 
118-120 
Brown sand 
Fine silt and sand becoming coarser toward the bottom. Sand 
contains 50% well-rounded basaltic grains. 
120-122 
Coarse calcareous sand 
and gravel 
Subangular reef detritus. 
122-129 
Brown mud 
Fine mud. No lime present. 
129-141 
Indurated limy mud 
Grayish-brown indurated mud with sharp break at top. Suggests 
very different environment. Contains tiny holes, possibly root 
holes with limonitic stain. Silty at 137-139 ft, with concre- 
tions. Some holes are lined with concentric structure. 
141-161 
Brown mud 
Brown mud with mottled soil structure. 
161-162 
Brown silt and sand 
Brown basaltic sand. 
162-163 
Brown mud 
163-165 
White mud 
White calcareous mud with some calcareous fragments; much 
recrystallized calcite with %-inch crystals. 
165-182 
Reef limestone 
Recrystallized reef limestone in fragments. 
182-184 
Limestone fragments 
in brown mud 
Broken reef fragments in mud. 
184-184.2 
Black organic mud 
184.2-192 
Brown mud 
192-194 
Fine sand 
Basaltic fine sand. 
194-199 
Brown mud 
199-204 
Muddy fine sand 
204-208 
Gravel and sand 
Basaltic pebbles partly weathered in a sandy matrix. 
208-239 
Brown mud 
Brown mud with pure calcite lumps V 2 inch across. 
239-241 
Gravel and sand 
Brown dirty basaltic sand with tiny round pebbles up to *4 
inch across. 
241-262.5 
Brown mud 
262.5-263 
Sand and gravel 
Brown nearly completely weathered basaltic gravel ( l /4 inch 
or less) and sand. 
263-268 
Brown mud 
268-271 
Coarse sand 
Coarse sand (basaltic) and mud. 
271-274 
Brown mud 
Brown basaltic mud. 
274-286 
Brown and 
Brown mud with soft secondary lime deposits and irregular 
white mud 
masses. A few hard calcite lumps. Lumps become more 
numerous at 285 ft. 
286-288 
Brown mud 
288-290 
Fine sand 
Fine basaltic sand and mud. Sand grains are mostly decomposed 
and have a variety of colors. 
