160 
PACIFIC SCIENCE, Vol. XXI, April 1967 
TABLE 1 ( Continued ) 
Description of Core from Ewa No. 1 Hole 
DEPTH 
(in feet) 
ROCK TYPE 
descriptive notes 
572-575 
Brown mud and lime 
A brown mud full of streaks and nodules of lime and a 
few shells. At 575 ft a hard 1-inch layer of dark 
greenish claystone full of shells in excellent state of 
preservation. 
575-585 
White mud and lime 
White calcareous mud full of nodules becoming indurated 
at 579-580 ft, then calcareous mud again. 
585-590 
Reef limestone 
Highly altered fragmental reef. 
590-597 
White limy mud 
White calcareous mud with nodules scattered throughout. 
597-609 
Greenish mud 
Greenish calcareous mud, highly fossiliferous, con- 
taining irregular red iron oxide streaks. 
609-617 
White mud 
At 611 ft in the white mud is a 1-inch layer of fine 
grained tuff. A few chunks of very hard chemically 
precipitated limestone. 
617-629 
Green and black mud 
Greenish calcareous mud, highly fossiliferous to 623 ft, 
then organic mud becoming blacker with depth. 
629-631 
Lignite 
Firm lignite full of fossil plant remains; no shells. 
631-635 
Gray-green mud 
Calcareous organic mud full of shells. 
635-646 
Gray mud 
Gray mud with shells. 
646-660 
Dark-gray mud 
Mud is becoming more organic ; still highly fossiliferous. 
660— 668 
Green and black mud 
Greenish-brown to olive black mud. Recognizable 
weathered basaltic grains. Few fossils. 
668-675.8 
Black sand 
Thin-bedded, compact, fine basaltic sand and silt. 
675.8-676.5 
Fine sand 
Fine calcareous sand and silt, highly fossiliferous. 
676.5-686 
Gray mud 
Gray calcareous mud with two beds of black mud at 
678 and 678.5 ft. Shells are in thin zones. 
686-706 
Tan mud 
Tan mud full of fossils. A layer of calcareous sand with 
abundant rounded grains of basalt and one un- 
weathered feldspar crystal possibly indicating tuff 
source at 692-693 ft. Laminated at 699 ft. 
706-727 
White mud 
Chalky white mud; fossils scarce. 
727-727.4 
Brown mud 
Firm brown mud. 
727.4-728 
Gray mud 
Calcareous gray mud. 
728-735.5 
Reef limestone 
Hard reef limestone; some layers contain grains of lime. 
735.5-7 64 
White mud and limestone 
nodules 
Hard limestone fragments in white mud, possibly a 
breccia transitional to reef below. 
764-792 
Reef limestone 
Highly altered fragmental reef limestone with a few 
shell molds and pockets of clay. White mud layer at 
776-778 ft. 
792-811 
Gray mud 
Gray calcareous mud, some limy streaks, and scarce 
solid nodules and concretions. 
06 
T 
CO 
ON 
Reef limestone 
Reef limestone. 
816-851 
Gray mud 
Gray calcareous mud with hard nodules and con- 
cretions up to % inch across. Some indurated layers. 
At 846-851 ft some mixed gray and green mud. 
