188 Transactions of the Academy of Science of St. Louis 
In the three 10 centimeter levels below this occupation 
containing the post molds there were no Imperial Plain sherds. 
Of 20 sherds, 7 were Herculaneum Cord Roughened, of which 
4 were limestone tempered, 12 were Plattin Clay Tempered and 
1 was St. Jo Polish Plain. 
Ash also occurred at these levels as well as a crudely chipped 
adze made of flint, an awl made from a large sliver of bone 
and an antler point with evidence of having been polished 
through use at the tapering end. Fragments of chipped pro- 
jectile points were found under a large limestone block that 
had fallen from the shelter roof. Considerable numbers of ani- 
mal bones indicate a limited hunting economy. Represented are 
mussels, birds, turtle, rabbit, possibly the bear and the deer. 
Occupation must have taken place in these small shelters 
during the time that they were being filled with wind blown 
silt. As far as this rock shelter is concerned shell tempered 
Imperial ware represents a later ware than Plattin Clay Tem- 
pered and grit tempered Herculaneum Cord Roughened con- 
tinued through all levels of occupation. It is significant also to 
note that the numbers of sherds increased the more superficial 
were the deposits. 
HIDDEN VALLEY ROCK SHELTER (LOCATION IIL) 
87 
The Hidden Valley Rock Shelter is located on a small tri- 
butary to the Joachim. The shelter sets back from this tributary 
and forms the head of a small wet weather branch. The shelter 
is large and gives the appearance of an amphitheatre. The 
mouth of the shelter faces east. It is approximately 35 meters 
across the mouth and is 15 meters deep. At the south end of 
the shelter there are several large stone blocks on the silt fill 
floor weighing several tons apiece. On one of these is a carving 
of a “thunderbird.” These fell from the shelter roof. A 
few smaller blocks lie on the surface at the north end of the 
shelter. There were few blocks visible near the center of 
the shelter in spite of the fact that the shelter ceiling was 
very much higher at this point than at either end of the shelter. 
