E and 
mvena an ARCHEOLOGY IN BRITISH GUIANA 123 
punctates to produce the decoration, is characteristic of the latter 
half of the sequence. The other three decorated types show slight 
changes in popularity but are present throughout the Phase. They 
are Mabaruma Incised, with incised lines along the top of broad, 
everted rims; Akawabi Incised and Modeled, which combines inci- 
sions with low to high relief modeling; and Aruka Incised, in which 
the rim or vessel surface is ornamented with incised designs. Vessel 
shapes are typically bowls with a variety of thickened, unthickened, 
and everted rim forms, and rounded jars with constricted mouths. 
Base forms include annular, flat, and flat pedestal, with the annular 
base characteristic of the early part of the Phase. With the possible 
exception of pot rests, both pottery artifacts and stone implements are 
rare. The latter include choppers, flake blades, hammerstones, pos- 
sible hoes, fragments of manos and metates, and polished celts. 
The inception of the Mabaruma Phase is estimated at about A.D. 
500 (p. 147). It is intrusive into the Northwest District and appears to 
have originated in a migration from the delta of the Orinoco. Changes 
in the popularity of pottery types, vessel shapes, and decorative motifs 
make it possible to subdivide the Phase into three periods (figs. 48, 49). 
The early period is characterized by a predominance of Barrancoid 
characteristics, the middle period by the introduction of a different 
style of modeling and several other innovations in vessel shape and 
decorative motifs, and the final period by contact with the Koriabo 
Phase. Since no archeological complex was found in the survey that 
follows it in time, the Mabaruma Phase presumably lasted until 
European contact. However, no objects of European origin were 
found in any of the late sites. 
513186—60——_10 
