180 BUREAU OF AMERICAN ETHNOLOGY (Bull. 177 
Ficure 78.—Wattle and daub fragments from sites of the Abary Phase. 
seriated sequence places the sites in consecutive position. B-1, the 
farthest downriver, is the earliest, while B-3, the farthest upriver, is 
the latest. If these sites are representative, they suggest an upriver 
movement of the population. 
All three of the sites have refuse deposits of 48-56 cm., suggesting a 
relatively high degree of village permanency. In order to compare 
village duration with that in other Phases both in British Guiana and 
at the mouth of the Amazon, the rate of refuse accumulation was com- 
puted from a formula based on density of sherds per standard area 
(Meggers and Evans, 1957, pp. 250-257), except that for greater con- 
venience the values were changed to apply to a 1- by 1-meter cut 
rather than one measuring 1.5 by 1.5 meters. The formula as modified 
