182 Proceedings of Indiana Academy of Science. 
This mahogany clay lies near the unconformity in the Mississippian 
system of rocks. The shales above and below the mahogany belongs to 
the Mississippian. 
State of Development.—Small pits have been dug at several places 
on the outcrop of the mahogany clay, but no serious attempt at develop- 
ment has been made. In order to determine whether the Indianaite 
occurs in sufficient quantities to warrant commercial development will 
require the drilling of wells along the sandstone ridge at some distance 
from the outcrop. Near the outcrop the clay is nearly always stained 
with oxides of iron. 
The number and thickness of the outcrops offer promise of workable 
beds of the white clay. A tunnel has been driven at one point to a 
distance of 130 feet. Six feet of fairly white kaolin was found in this 
tunnel, and the indications are that a marketable quantity exists. 
