186 BUREAU OF AMERICAN ETHNOLOGY [Bull. 177 
Modeled third, and Mabaruma Incised absent. Hotokwai Plain is the 
only plain type represented, and by inference must have been a major 
type in the Mabaruma Phase at the time of contact. Comparison 
of this distribution of relative frequencies with the Mabaruma Phase 
pottery type seriation (fig. 48) makes it possible to rule out at once 
the early part of the sequence as the time of contact. During this 
time, Mabaruma Incised is popular and Hotokwai Plain is present 
only in alow percentage frequency, the reverse of the situation implied 
by the trade sherds. The latter quarter of the Mabaruma Phase 
sequence can also be eliminated because at this time Hotokwai Plain 
is very rare and Koberimo Plain, tempered with mica, is common. 
Although Koberimo Plain is distinctive and readily recognized, not 
a single example was identified among the trade sherds from the Abary 
Phase. The proportions of the trade sherds correspond rather well 
to those existing in the remaining portion of the Mabaruma Phase 
sequence, represented by the levels of N-13. During this time Hotok- 
wai Plain is the dominant plain type, and among the decorated types 
Aruka Incised is most common, Kaituma Incised and Punctate sec- 
ond, with Akawabi Incised and Modeled next, and Mabaruma Incised 
rare to absent. Various inferences put the estimated dating of this 
portion of the Mabaruma Phase sequence at between approximately 
A.D. 1000 and 1300 (see p. 147 for details). 
The presence of sherds of Mabaruma Phase origin throughout the 
period represented by the occupation of B-1 suggests that contact 
was of considerable duration. If trade sherds had been limited to the 
early levels, it might have been concluded that contact took place 
when the Abary Phase entered British Guiana and was lost when the 
group moved farther to the east and settled on the Abary River. 
Examination of the archeological situation on the portion of the coast 
between the Abary River and the Northwest District shows that com- 
munication between the two Phases could easily have been maintained. 
In addition to sherds of undocumented provenience, information is 
available on three sites between the Demerara and Mahaica Rivers, 
in the region known as East Coast Demerara (fig. 58). Mon Repos 
and Chateau Margot were visited by Osgood, who made sherd collec- 
tions. These were unfortunately lost in the Georgetown fire of 1945, 
but notes and illustrations indicate that typical Mabaruma Phase 
forms of decoration were present (Osgood, 1946, pp. 52-54). At 
Mon Repos, they included Aruka Incised, Kaituma Incised and 
Punctate (op. cit., fig. 12), and Akawabi Incised and Modeled. The 
adornos are said to be “of a simple modeled type, not ornate with 
patterned incising as in the Barrancos style” (op. cit., p. 53), which 
would correlate best with the latter half of the Mabaruma Phase, 
when the adornos have lost their Barrancoid characteristics. The 
