138 BUREAU OF AMERICAN ETHNOLOGY [Bull, 177 
UNCLASSIFIED PLAIN 
Fifty-six sherds from N-3, level 8-16 cm. and level 16-24 cm., appear to 
be from one or two vessels and have a series of characteristics that are slightly 
different from the other plain pottery types. The reason for not including these 
sherds in Koriabo Plain is that in among the coarse sand temper: poorly mixed 
throughout the paste, there is a large amount of black ash from vegetal 
inaterial visible in the cross section of each sherd as specks or streaks. The fact 
that these sherds have less coarse sand temper than is typical of Koriabo Plain 
suggests that there may have been an addition of vegetable material in the clay 
in place of a portion of the sand normally included. All other features of sur- 
face treatment, color of surfaces, and paste resemble Koriabo Plain. With the 
more clayey and less sandy texture of the paste, it is softer than Koriabo Plain, 
with a hardness of 2.5. 
The vessel forms are open bowls, one with direct rim, rounded lip, and mouth 
diameter of 32 em.; the other with slightly thickened raised rib on the rim 
interior and a mouth diameter 18 em. 
UNCLASSIFIED WHITE SLIPPED 
Twenty-two sherds with a white slip come from various levels and sites of the 
Koriabo Phase; see Appendix, table 16, for the tabulation. 
Paste: On the coarse, orange paste of Koriabo Plain. 
SuRFACES: Except for the slip, the surfaces are typical of Koriabo Plain. 
Slip: Pxterior surface slipped with a creamy-white slip ranging in thickness 
from paper thin to 0.5mm. Slip in a few cases has crackled. Only one 
example of slipping on both exterior and interior. 
ForM: Slipped surfaces were found only on body sherds with one exception. 
These body sherds varied in thickness from 5-10 mm., with body diameters 
up to 30cm. The rim is from a small open bowl with curved sides, ending in 
an almost vertical, direct rim with a flattened lip. The lip is painted red, both 
interior and exterior surfaces are white. 
WARAPOCO PLAIN 
PASTE: 
Method of manufacturing: Coiling, although in most cases the coils were 
worked wet enough and so well kneaded together that distinct cleavage 
along the coil line is not typical (pl. 34, k). 
Temper: Predominantly coarse sand containing clear to white quartz and 
feldspar particles up to 5 mm. in diameter (pl. 34, c). All the edges well 
waterworn. Large quantity of temper, in some cases constituting almost 
one-half the volume of the paste mixture. 
Texture: Generally coarse and sandy, with the fractured edges very ir- 
regular. Except where an unusually large temper particle occurs and 
weakens the paste, the tensile strength is generally good and sherds do 
not break easily. Temper poorly mixed so there is bunching of the par- 
ticles; air pockets also common. 
Color: A gray to black core is the main feature differentiating this type from 
Koriabo Plain. Fired light tan to brown on the exterior and interior, 
producing a band varying from paper thinness to 3 mm. thick, with the 
interior core gray. 
Firing: Incompletely oxidized ; fire clouds common. Sometimes the interior 
of the bowl or the jar is grayish or black suggesting firing with the mouth 
upside down, creating a smudging effect. 
