Archaeological Investigations in Jefferson County, Mo. 159 
very high polish. It is either black or dark reddish brown. The 
only shape identifiable is the water bottle form. The closest 
analogy is the Polished Ware described on p. 51 of Rediscovering 
Illinois. This is not uncommon at Cahokia where it is known 
as Powell Polish Plain. 
Crystal City Cord Marked (Bz) 
This ware is similar to Herculaneum Cord Roughened but 
is tempered with shell fragments. Many sherds of this ware have 
been found at Cahokia. 
Clay Tempered Pottery 
Plattin Clay Tempered (C) 
In addition to the stone tempered and shell tempered wares 
there is a clay tempered ware usually found as a common bow] 
and a bowl with a neck form having angular shoulders. This 
ware has been named Plattin Clay Tempered. The surface is 
cord roughened and the tempering is particles of clay. The hard- 
ness is 2.5 to 3 inclusive. There are two pot shapes, a shallow 
bowl and an olla or jar with a wide neck and slightly flaring rim, 
often with angular shoulders. The cord marking on the latter 
Shapes were deep and below the angular shoulders, According to 
Dr. Griffin the closest analogy is the clay tempered ware found by 
Dr. A: R. Kelly at the Korando site in Jackson County, Illinois. 
It is Occasionally difficult to separate Herculaneum Cord 
Roughened, Herculaneum Reddish Buff, Crystal City Cord 
Roughened and Plattin Clay Tempered ware because the texture, 
hardness and surface treatment is often highly similar in all 
three wares. Sometimes the tempering appears to be a mixture 
Of clay and grit or shell, or grit and shell. However, pottery 
Shapes as indicated by large rim sherds usually closely follow 
Pottery types. 
LOCATIONS INVESTIGATED 
A location is a localized area containing one or more sites. 
A total of thirteen locations were wholly or partly investigated 
