SEBASTIAN COUNTY. 
211 
Close to the kiln and on the same quarter section there is a small 
deposit of stiff light-blue clay which has been turned for pottery, but 
without success. When this blue clay was used alone the ware made 
from it cracked in drying. A mixture of this and a pale-blue, almost 
white, sandy clay from the NE. \ NE. \ sec. 7, T. 6 N., R. 30 W., has 
also been tried with some success. The results, however, were not 
altogether satisfactory and the work was abandoned. 
The pale-blue sandy clay from sec. 7, T. 6 N., R. 30 W., outcrops at 
several places along the side of a small hill and in the bottom and 
banks of a small stream that crosses the wagon road leading from 
Greenwood to Charleston. Mr. Comby tried this clay alone for the 
manufacture of pottery, but with the appliances at command he did 
not succeed. When mixed with the surface clay from the SE. J 
SE. i sec. 27, T. 7 N., R. 30 W., the results were fairly successful. 
GLAZING MATERIAL. 
Mr. Comby tried a black silt found on the bottom lands at the 
mouth of Vache Grasse Creek for glazing purposes. It is said to have 
served the purpose of a slip, but not much reliance can be placed 
upon the experiment. Analyses of this river deposit and of the 
Albany slip have been made by the Arkansas Geological Survey. 
Analysis of Vache Grasse and Albany slip. 
[Brackett & Smith, analysts.] 
Silica (Si0 2 ) 
Alumina (AI2O3) 
Iron (ferric) oxide ( F<'.,< > 3 ) 
Lime (CaO) 
Magnesia (MgO) 
Potash (K 2 0) 
Soda (Na 2 0) 
Water (H 2 0) 
Vache 
Grasse 
slip. 
70.95 
12. 24 
4.73 
1.90 
.97 
1.14 
.66 
7.01 
,60 
Albany 
slip. 
58. 05 
14.86 
6.76 
6.61 
3.08 
1.18 
.80 
7.41 
'.is. 7:, 
PRAIRIE CLAYS. 
Over the whole of the upland portion of Sebastian County the soils 
are derived by decomposition from the rocks. The materials are 
shifted somewhat — washed down from the slopes and spread over the 
valleys — and are afterward more or less leached and altered by 
secular weathering. This process produces what are popularly 
known as " buckshot clays" of the prairies and slashes. These clays 
are not specifically mentioned as characteristic of this county, but as 
they are derived chiefly from the shales they are mentioned under 
this general head. 
The whole of sec. 3, the greater part of sec. 2, the SE. j sec. 1, the 
NE. J NE. \ sec. 10, and the NW. \ sec. 11, T. 8 N., R. 32 W., are 
