286 
(7.5YR hue) and a very few yellowish brown 
(10YR hue) below the A horizon. Bauxitic 
Latosols, Alluvial Soils, and Lithosols or 
lithosolic soils are minor components of the 
association. With a total area of 78 square 
miles, this association is much the largest in 
the Palau Islands. It extends from one end of 
Babelthuap to the other, covers all of Araka- 
besan and Malakal, and occupies those parts 
of Koror and Auluptagel underlain by vol- 
canic rocks. 
Topography is largely hilly; dominant 
slope gradients fall between 15 and 45 per 
cent. Departures from the dominant topog- 
raphy occur on major divides, where the up- 
lands are undulating or gently rolling, and 
immediately adjacent to the valleys of large 
streams, where slopes are commonly steep. 
Hilly topography, however, dominates the 
association. 
A profile description to illustrate the major 
reddish Latosols of the association follows. 
(a) Setting. This profile was described and 
sampled on the island of Arakabesan about 
1,000 yards west of the causeway leading to 
Koror. The site is about 100 feet above sea 
level in well- dissected uplands and has a slope 
of 15 per cent to the east. Vegetation in the 
vicinity has been disturbed by fire and by 
cutting, though there was little cultivation 
in evidence. 
(b) Profile Description. 
Ai 0-12" Dark reddish-brown (5YR 
3/4) silty clay loam, dark 
brown (7.5YR 3/4) when 
dry; weak, fine and very 
fine granular structure; 
soft, very friable; many 
roots ; few stone fragments ; 
strongly acid. 
B 2 i 12-26" Dark red (2.5YR 3/6) silty 
clay, yellowish red (5YR 
4/6) when dry; compound 
structure of moderate fine 
and medium subangular 
blocks breaking readily to 
moderate fine and medium 
PACIFIC SCIENCE, Vol. XII, October, 1958 
granules; slightly hard, fri- 
able, slightly plastic; roots 
common; few pinholes, 
wormholes, and stone frag- 
ments; strongly acid. 
B 2 2 26-33" Yellowish-red (5YR 4/6) 
silty clay, yellowish red 
(5YR 5/6) when dry; com- 
pound structure of mod- 
erate fine and medium 
angular blocks breaking 
readily to moderate medi- 
um and fine granules; 
slightly hard; friable, 
slightly plastic; few roots; 
pinholes and wormholes 
common; strongly acid. 
B 2 3 33-39 " Comparable to B 2 i in tex- 
ture, structure, and con- 
sistence but dark red 
(2.5YR 3/8) in color; few 
roots; pinholes and worm- 
holes common; strongly 
acid. 
Ci 39-60" Brindled and finely varie- 
gated red, yellowish-red, 
pale-yellow, and light-gray 
(intermediate colors also 
present) silty clay loam; 
massive; soft, very friable; 
strongly acid. 
C 2 60-102" Similar to Ci horizon but 
with lower proportions of 
grays in the color pattern. 
C 3 102-120" Finely variegated reddish- 
yellow and light- gray silty 
clay loam with few medi- 
um distinct mottles of 
weak red; massive in place 
but breaks out in weak 
coarse plates with black 
coatings on many faces; 
slightly hard, firm; strong- 
ly acid. 
(c) Additional Notes. The identification of 
the B 2 2 and B 23 horizons is open to question. 
The B 2 2 is like the adjacent ones in texture, 
