142 BUREAU OF AMERICAN ETHNOLOGY [Bull. 177 
Pot rests.—Fragments of pot rests are easy to distinguish because 
of their irregular shape, a thickness greater than a vessel wall, and 
the position of the finished surface. The paste is bright orange and 
very sandy with abundant coarse temper. There is so much sand in 
the clay that the paste crumbles away under light rubbing. On the 
larger fragments, one surface is usually curved. Features of a num- 
ber of fragments suggest the form was a truncated cone with a flat 
base, straight but insloping sides, and a top that is either flat, slightly 
convex, or sometimes punched with the fingers to a depth of 2-3 cm. 
in the center and around the edge. Diameter of the upper end is 
about 8 cm., that of base 11-12 cm. Height ranges from 10-15 cm. 
Pot rest fragments came from all the sites of the Koriabo Phase. 
Worked sherd—One sherd of Koriabo Plain from the surface of 
N-2 is shaped into a six-sided artifact with the edges rounded. It 
may have been used as a pottery scraper to remove the uneven clay 
particles from the vessel during construction. The narrowest sides 
measure 1.6 cm., the others range from 2.8-3.4 cm. 
THE SITE SEQUENCE AND ITS IMPLICATIONS 
The seriated sequence of the Koriabo Phase is based on six strati- 
graphic excavations in four habitation sites. All showed the same 
general trend in the two major plain wares, an increase in Koriabo 
Plain and a decrease in Warapoco Plain. An attempt was made to 
interdigitate the levels from the various cuts, but since this procedure 
did not produce a notably smoother pattern of change, it did not seem 
justifiable to give it preference over the successive position of the 
sites. Since Cut 1 contained the most levels, it was selected to 
represent N-2. 
The clearest trends exhibited by the seriated sequence are in the 
plain wares (fig. 57). Warapoco Plain, with a gray core, is most 
abundant at the beginning of the Phase, constituting 58.8 percent 
of the total sherds in the earliest level. From this climax, it declines 
to 29.8 percent at the end of the Phase. During the same period of 
time, Koriabo Plain, which has an orange core, increases from 33.2 
percent to 54.7 percent. Cariapé-tempered Barima Plain occurs in 
minor amounts at all sites, but is not present in all levels. It begins 
with a frequency of 1.2 percent, increases to 6.8 percent in the middle 
of the sequence, and then declines again to 1.1 percent. Although 
this type has been described as one of the pottery types of the Koriabo 
Phase, the fact that it occurs in a smaller frequency than Koberimo 
Plain, which is known to be acquired by trade, suggests that it may 
also be a trade ware (see pp. 151-152 for further discussion). 
Koriabo Phase decorated types comprise only 4.3 percent of the 
total sherds recovered from all the sites, and 4.9 percent of the total 
