124 THE CLAYS OF ARKANSAS. 
patches, however, are not very thick nor of great extent. Their 
longer axes generally have a north-south direction. 
The following section shows the relation of the clays and shales of 
low grounds about Coal Hill: 
Section near Coal Hill. 
Feet. 
Brown sandy loam 1 
Brownish-yellow clay with iron nodules and small sandstone pebbles . 2 
Shales with iron-stained streaks 4 
Black shales at base. 
No establishments engaged in the manufacture of clay products in 
Johnson County are at present reported. 
LAFAYETTE COUNTY. 
Lafayette County lies almost wholly in the alluvial plain of Red 
River. The geology of these alluvial lands is as a rule less interesting 
than that of the higher country east and west. There is, however, a 
strip 6 or 8 miles wide running along the extreme eastern border of 
the county that has the same geology as Columbia and southern 
Hempstead counties, and in this region the Tertiary clays are likely 
to be found. In the vicinity of New Lewisville the cuts along the 
railroad expose no clay beds that appear to be of importance. Near 
Bradley station a well put down on the land of H. Smith, in the NW. J 
sec. 13, T. 19 S., R. 25 W., has the following record: 
Section near Bradley station. 
Feet. 
Soil and sand 18 
Red clay 9 
Sand 10 
About Walnut Hills are massive beds of red sand, but no clay beds 
were observed except bright-red ones. In the lowlands along Red 
River many local pockets of leached pottery clays and extensive beds 
of good brick clays may be found. 
There are no industries of any kind in the county engaged in the 
manufacture of clay products. 
LAWRENCE COUNTY. 
GENERAL GEOLOGY. 
Black River marks the boundary between the Paleozoic and 
Quaternary deposits of Lawrence County. The Quaternary area is 
a level plain having a maximum elevation of about 280 feet and a 
minimum of about 250 feet. 
The streams all flow southwestward, roughly parallel to Black 
River, and narrow clay flats lie between the streams and the river. 
The soil adjacent to the streams is of alluvial origin, covering areas 
