522 ARCHEOLOGICAL INVESTIGATIONS—II [ETH. ANN. 44 
The surface has the bluish-gray tint belonging to many similar large 
pieces from western Kentucky and Tennessee. The fracture, which 
is quite recent, shows, however, that the outward color is scarcely 
more than a film, the unweathered interior being almost the color of 
dark-blue slate. This feature may aid in determining the identity 
of the quarry when it is discovered. 
The middle part of the terrace is the site of a workshop similar to 
that on the west; but it has more remains of occupancy in the way 
of hammers, mortars, pestles, anvil or cup stones, and burned rock. 
The third part of the terrace, that farthest east, is said to contain 
remains similar to those on the other two; but dense vegetation 
prevented examination. 
Other workshops examined are much like this, except that none are 
as well defined or cover as large an area. 
Furnt In Harrison Country, Iyp. 
The Indiana Geological Survey Report for 1878 gives upon the 
map of Harrison County several localities in which it is said 
aboriginal flint workers quarried for raw material. So much of 
the map as is necessary in this connection is reproduced here in 
Figure 16. Two of the places marked are wrongly described. It is 
true that flint occurs in considerable quantities, but it is somewhat 
granular or porous and not fitted for the use of the Indian. A 
large portion of Harrison County is strewn with chert from the 
Chester and St. Louis groups of the Subcarboniferous limestone. 
Most of it is dull yellow or gray in color, porous or fragmental in 
character, and much of it contains crystals or fossils or the cavities 
from which these have weathered out. Occasionally a nodule may 
be found in this chert which is more solid than the general mass; 
the central part of such sometimes affords good material for imple- 
ments of small size. 
In one part of the St. Louis limestone is a stratum, said by the 
survey report to be not more than 18 or 20 inches thick, which in 
places seems to be composed largely or almost entirely of rounded 
or flattened nodules of very compact blue or gray hornstone, vary- 
ing in their dimensions from the size of a pea to spheres 6 inches in 
diameter; spheroids up to 10 or 12 inches across by 3 to 6 inches 
thick; and ellipsoids with an extreme length of 15 or 16 inches. 
The outlines of the last are often quite irregular; while a section 
through either the longest or the shortest diameter will be an 
ellipse, the median plane may have a more or less tortuous outline. 
All of these forms have an outer coating of yellowish or grayish 
chalk-like substance resulting partly from decomposition of the 
hornstone and partly from contact with the limestone in which it is 
