86 BUREAU OF AMERICAN ETHNOLOGY [Bull. 177 
their order of popularity, are fine-grained quartzite, granite (usually 
biotitic granite rather than muscovite granite), felsite, quartz, ande- 
site, a few miscellaneous large fragments of mica of the muscovite 
variety, and feldspar. 
PoTTEeRY TYPE DESCRIPTIONS 
The ceramic study of the Mabaruma Phase is based on the analysis 
of 9,610 sherds of local manufacture of which 1,323 or 13.8 percent are 
decorated. Only one complete vessel was found. The pottery was 
classified into four plain and four decorated types. The frequency 
of each type by level and site is given in the Appendix, table 3. Pot- 
tery types are described in alphabetical order, followed by description 
of unclassified and trade sherds. 
AKAWABI INCISED AND MODELED 
Paste: This decorated type was placed on all four of the plain wares of the 
Mabaruma Phase—Mabaruma Plain, Hosororo Plain, Hotokwai Plain, and 
Koberimo Plain. Apparently no preference occurred, and whatever plain- 
wares were most popular at the time were used. At sites reflecting the early 
part of the sequence this decorated type is found more commonly on Mabaruma 
Plain, while in the late part of the sequence the decorated type appears 
typically on paste of Hosororo Plain and Koberimo Plain. See the above- 
mentioned plain pottery type descriptions for details of temper, color, and 
firing. 
SurFraces: Both in color and treatment, the surfaces are typical of the particular 
plain pottery type except that the surfaces of the decorated sherds are always 
better smoothed and more even. 
ForM: 
Rim: Direct with rounded or slightly tapered lip; everted with rounded lip ; 
rarely, everted to produce a wide flange with rounded lip. 
Body wall thickness: 3-11 mm. ; majority 5-6 mm. 
Body diameters: Range 20-32 cm. 
Base: No bases have decorations on the adjoining lower portion of the side 
walls, therefore it is not possible to associate definitely any particular base 
sherd with the type; however, bases must be of the forms found in the 
plainwares: flat, flat pedestal, and annular. 
Major vessel shapes reconstructed from sherds: 
1. Open bowl with outslanting to vertical sidewalls and a direct rim, 
usually with rounded lip but sometimes slightly tapered or flat- 
tened. Body wall thickness 3-9 mm., majority 5-6 mm.; mouth 
diameter 12-26 em. Bowl depth reconstructed as shallow, from 
8-15 cm., with a few possibly 5-6 cm. Decoration on exterior, 
occasionally on interior (fig. 30-1). 
2. Bowl with incurving sidewalls, direct rim, rounded or flattened lip. 
Body wall thickness 5-6 mm.; mouth diameter 12-32 em. Dec- 
oration on exterior (fig. 30-2). 
8. Large open bowl with walls outslanting, then upeurving to a broad, 
sharply everted, flange rim with a rounded lip. Body wall thick- 
ness 8-10 mm.; rim up to 15 mm. thick and 2.3-3.5 cm. wide, with 
a flat or curved top. Inside mouth diameter 26-34 cm. Large 
