Archaeological Investigations in Jefferson County, Mo. 189 
The surface of the shelter to a depth of 15 centimeters was 
littered with rusty tin cans, crockery, nails and fireplaces left 
by modern campers. 
After laying out our two meter grid system we marked out 
the deposits in 10 centimeter vertical layers leaving steps at 
intermittent squares for profile study. Expansions were often 
carried out on one level to expose fireplace outlines. Soon 
after excavations were started a stain was noted on the floor 
of the excavations at the north end of the shelter indicating 
a possible bank level of an ancient gully along the shelter edge 
that had been subsequently covered with silt. “This discovery 
forced us to alter our excavational procedure which then con- 
sisted of a trench excavated to the original rock floor running 
across the shelter mouth approximately under the overhang. 
We were, therefore, able to photograph visible stratification 
lines in our vertical profiles. 
Investigations on this large trench have been completed. 
This winter we shall work out the remainder of the deposits 
between the rear of the shelter and the sub-overhang trench. 
The silt fill of the shelter had accumulated largely as a 
result of surface water erosion along high talus banks flanking 
the two ends and partly as a result of disintegration of the rock 
Shelter which was hollowed out of Saint Peter sandstone. 
As we excavated the sub-overhang trench it became increas- 
ingly apparent that there had been two shelter fills. Along the 
northwest and southwest edges of the shelter were deposits 
Showing little organic content with predominant silt fill, In all 
of the center of the shelter and the northeast and southwest 
ends of the shelter the silt fill was a much darker color. As a 
result a saucer shaped outline tapering to a restricted area 
where the intermittent underground stream now issues from 
the shelter is visible in our photographs (See Plate IX B). 
The dark area with humus content extends to the rock floor 
where the stream leaves the shelter and is much more shallow 
at the south end. The edges of the old gully bank are visible 
on the vertical profile at A, B and on the horizontal profile C, 
