136 BUREAU OF AMERICAN ETHNOLOGY [Bull. 177 
long and extend 1.0-2.4 cm. out beyond the normal rim edge. 
They are either plain or ornamented with a nicked edge (pl. 34, e, 
9, h, j). 
2. Small bowls or jars with incurving side walls, a constricted mouth 
and a direct rim with a rounded or tapered lip. Mouth diameter 
10-20 em.; body diameter estimated 15-28 cm. (fig. 54-2). 
3. Large open bowls with everted rims. Usually the rim is slightly 
thickened where it bends outward, forming a flat to slightly con- 
eave surface 1.2-2.0 cm. wide and ending in a rounded or slightly 
tapered lip. Mouth diameter 14-24 em. (fig. 54-3). 
4. Large open bowls with interiorly thickened rims forming a rounded, 
beveled band along the rim 1.0-1.8 cm. wide with a rounded lip. 
Rim thickness ranges from 7-12 mm.; rim diameter 18-32 cm. 
(fig. 544). 
5. Large open bowls with slightly thickened everted rims with a broad 
channel or groove on the inner surface. The total width of the 
everted rim ranges from 1.5-2.5 em., with the width of the chan- 
nel usually 1.0 cm. but occasionally 1.4 em. The lip is flattened. 
Rim diameter typically 18-24 cm., with one specimen 38 cm. (fig. 
54-5; pl. 34, a-b, d). 
6. Jars with walls vertical or insloping to an exteriorly thickened rim. 
The rim is usually thickened by the addition of a coil, producing 
a horizontal extension ranging from 1.0 cm. wide to 2.5 cm. wide 
with the edges beveled so that the cross section is angular. 
Mouth diameter typically 14-22 cm., with one as large as 32 cm. 
(fig. 54-6 ; pl. 34, f, i). 
7. Griddles. Large, circular, flat slabs of pottery with the body wall 
ranging in thickness from 1.0-1.9 cm. The rim is usually unthick- 
ened and rounded, but occasionally it is slightly thickened and 
upturned; lip is rounded. Diameter 40-46 cm. (fig. 54-7). 
TEMPORAL DIFFERENCES WITHIN THE TYPE: Although the number of rim sherds 
in some forms is not large enough to be conclusive, Forms 5 and 6 appear 
to be restricted to the middle and upper (late) part of the Koriabo Phase 
sequence (Appendix, table 18). 
CHRONOLOGICAL POSITION OF THE TYPE: Present throughout the Phase, increasing 
in popularity from 33.2 percent to 54.7 percent (fig. 57). 
KORIABO SCRAPED 
PASTH AND SURFACES: All on Koriabo Plain; see the description of that plain 
pottery type for details. 
Form: 
Rims: Wide everted and flaring rims with large lobes and a rounded lip; 
exteriorly thickened with a channel on inner edge and a rounded lip; 
thickened with a coil around the edge, ranging in cross section from tri- 
angular with rounded edges to squared or angular and many faceted. 
Body wall thickness: 5-8 mm. 
Body diameters: 16-24 cm. 
Bases: Flat. 
Vessel shapes reconstructed from sherds: 
1. Large open bowls with wide, flaring, everted rim forming an angular 
junction with the body wall. The rim is ornamented with some 
type of lobe. The lobes vary from 1.5-3.0 cm. in width along the 
