Byans apa ARCHEOLOGY IN BRITISH GUIANA 131 
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te) | 2 3 CM fe) 4 8 12 CM 
RIM SCALE VESSEL SCALE 
Ficure 52.—Rim profiles and reconstructed vessel shapes of Barima Plain, Koriabo Phase 
(Appendix, table 17). 
SURFACE: 
Color: Tan to tan orange to light orange on both surfaces. A few gray on 
interior only. 
Treatment: Due to softness of paste, all sherds are so badly eroded that 
surface treatment is difficult to determine. A few are smoothed and fairly 
even on the exterior, having been scraped with a gourd or potsherd scraper. 
They are generally slightly less well smoothed on the interior. 
Hardness: 2-2.5 
Form: 
Rim: Direct or slightly thickened and everted with rounded lip. 
Body wall thickness: 5-11 mm.; majority 5-6 mm. One griddle fragment 
15 mm. thick. 
Body diameters: 26-36 cm. 
Base: Flat; too fragmentary for accurate diameter measurement. 
Common vessel shapes reconstructed from sherds: 
1. Open bowl with vertical upper walls, direct or slightly everted and 
thickened rim with rounded lip. Mouth diameter 20-38 cm. (fig. 
52-1; pl. 32, c). 
2. Small bowl or jar with constricted mouth, direct rim, and rounded 
lip. Mouth diameter 22 cm. (fig. 52-2). 
3. Globular jar with thickened upturned rim. Mouth diameter 12 cm. 
(fig. 52-3 ; pl. 32, b). 
4. Griddle with a thickened rim and rounded lip. Diameter 40 cm.; 
thickness 1.3-1.5 em. (fig. 52-4). 
TEMPORAL DIFFERENCES WITHIN THE TYPE: None evident in the small sample 
(Appendix, table 17). 
CHRONOLOGICAL POSITION OF THE TYPE: Although never very common, the type in- 
creases in popularity from 1.2 percent at the bottom of the Koriabo Phase 
sequence to 6.8 percent in the middle of the sequence; thereafter it declines 
again to 1.1 percent (fig. 57). 
