128 BUREAU OF AMERICAN ETHNOLOGY [Bull. 177 
boulders along the water’s edge have grooves worn in them from 
sharpening stone axes or use as metates (pl. 31, 6). The custom of 
clearing off all the grass in the village area has resulted in consider- 
able erosion, and only a few patches of the original dark soil are left 
in between the rocks and by the school. The exposed sherds are not 
only badly eroded, but the villagers walking on them have reduced 
most of them to buckshot. The distribution suggests that the site ex- 
tended up the hillside 62 meters by 40 meters wide. The site area is 
surrounded by large clumps of cane that the present villagers say 
were planted by the “old-time people.” 
The only relatively undisturbed area was on the southwest side 
near the school, where a strata cut 2 by 2 meters was dug in 8-cm. 
levels. It produced the following results: 
Level 0-8 cm___. Black loam, sherds small and sparse, a few small hunks 
of granite; modern rusty nail and fragment of school 
slate in grass roots. 
Level 8-16 em__. Soil brownish color; small stones including iron concre- 
tions more abundant. Sherds sparse. 
Level 16-50 em_. Below 16 em. soil is sterile, light-brown clay streaked 
with pockets of bright-orange clay. Below 30 cm. 
bright orange clay appears, containing many iron 
concretions. 
DATA FROM OTHER INVESTIGATIONS 
It is impossible to assign with certainty any previously investigated 
sites to the Koriabo Phase. 
ANALYSIS OF MATERIALS 
The artifacts from the Koriabo Phase consist of objects made from 
various rock materials and pottery. Provenience and frequency are 
given in the Appendix, tables 15 and 16. 
Stone Arriract TYPES 
Twelve stone artifacts and eleven flakes were collected from sites of 
the Koriabo Phase. 
Adz (fig. 51, a)—A piece of fine-grained quartzite was well 
polished on all surfaces to form an adz, which in cross section is gen- 
erally triangular. The bit is well sharpened. The butt is broken 
off, making the existing fragment 7.5 cm. long and 4.7 cm. wide. The 
bit is 4.5 em. wide and 2.8 cm. thick at the center, tapering to 1.0 cm. 
on the rounded edges. 
Celt—Only fragments were found; these were of highly polished 
_ felsite and andesite, apparently rectanguloid in shape with a very 
sharp bit. All details resemble celts of the Mabaruma Phase, 
