PULASKI COUNTY. 163 
In the NE. J and the NE. \ NW. \ sec. 9, T. 1 S., R. 12 W., the 
exposures of clay occur on the middle Pine Bluff road about a quarter 
of a mile south of the end of the turnpike. It is exposed along both 
sides of the road for a distance of about 300 feet, and again in the road 
leading from the main road to D. Rausch's house for about 250 feet. 
At these exposures the clay where it is first seen has a dark pearl color 
and comes out in angular blocks that are somewhat stained with iron. 
Nothing is known of the depth or extent of this material, but it is 
probable that it will be found clearer of iron stain at no great distance 
below the surface, for the iron that coats many of the blocks has 
been washed into the crevices from the overlying surface sands. 
Small surface fragments seem to show that it extends to the middle 
of sec. 8, the section next west of that in which these exposures occur, 
and also into sec. 10 on the east. In the NW. \ NW. \ sec. 8 it is 
said to have been cut in a well at a depth of 14 feet. About 100 feet 
north of D. Rausch's house clay mingled with syenite bowlders is 
exposed at the surface. A light-gray clay is also reported from the 
W. J NW. J sec. 15, T. 1 S., R. 12 W., but the locality has not been 
examined. 
A well in the NW. \ NE. \ sec. 2 of this township is said to have 
penetrated white clay at a depth of 27 feet. A small exposure is also 
reported at the corner between sees. 3, 4, 9, and 10. Mr. E. C. 
Buchanan reports an outcrop in the SW. \ SE. \ sec. 3, T. 2 S., 
R. 13 W., similar to that found in sec. 9. Samples of this kaolin from 
the road near the middle of sec. 9 were analyzed and subjected to 
various practical tests in order to determine its availability as a 
china clay. 
Analysis of Pulaski County kaolinite from sec. 9, T. 1 S., R. 12 W. 
Silica (Si0 2 ) 46. 27 
Alumina (A1 2 3 ) - 38. 57 
Iron (ferric) oxide (Fe 2 3 ) 1. 3(5 
Lime (CaO) 34 
Magnesia (MgO) 25 
Potash (K 2 0) 23 
Soda (Na 2 0) 37 
Water 13. 61 
101. 00 
Water at 110°-115° C 1. 57 
It will be seen that the percentage of iron in this clay is rather high. 
Samples were tested by practical potters at Trenton, N. J., with the 
following results : The body of the crude clay burns a beautiful whit<\ 
but a great number of rusty brown specks are scattered over this white 
ground, the largest of them one-sixteenth of an inch in diameter. 
This clay cracks in firing, but not enougfi to prevent its use for fine 
pottery if it were available in other respects. The iron in this clay 
