Archaeological Investigations in Jefferson County, Mo. 195 
recent and old silt fills to find groups of sherds and artifacts 
next to and at the same depth as pockets of much older imple- 
ments with no pottery or a very small amount of it. 
Fireplaces with these more recent occupations vary. The 
older fireplaces are simply large irregular masses of mashed 
charcoal and charcoal stains in the silt fill. The more recent 
fireplaces seem to have been small oval or circular burned clay 
formations. Several of these have been noted close to the surface 
and large irregular fireplaces have been burned to an average 
depth of 60 centimeters (25 inches) just north of the large boul- 
ders at the south end of the surface and 20 to 30 centimeters depth 
at the north end. The erosive power of the intermittent stream 
seems to have at least partly broken up fireplace formations 
at the center of the shelter and under the overhang where the 
stream issues from the shelter. Pottery fragments and arti- 
facts are usually found around these fireplaces but not always. 
Occasionally they are found at considerable distances from such 
indication of more or less permanent occupancy. 
In contradistinction to the earliest and the middle occupa- 
tions animal bones are quite plentiful with these occupations 
and include predominantly deer, turtle, fish and birds, and 
groundhog, 
A percentage study of pottery types has revealed a very 
interesting situation. Imperial Plain sherds and Herculaneum 
Cord Roughened sherds are found mixed with a dominance of 
Herculaneum Cord Roughened from the deepest levels to the sur- 
face of the area just north of the large boulders. With these 
Sherds are short broad stemmed points and small isosceles tri- 
angular projectile points coarsely chipped. On the other hand 
the lower levels that have been excavated just north of the 
center of the shelter thus far show a marked predominance of 
Imperial Plain sherds near the surface, whereas at deeper levels 
Herculaneum Cord Roughened sherds are predominant. Of 72 
sherds found to 20 centimeters below the surface in this localized 
area, 50 were Imperial Plain and 22 Herculaneum Cord Rough- 
ened. Of 59 sherds found from 20 to 40 centimeters deep only 
11 were Imperial Plain but 48 were Herculaneum Cord Rough- 
