90 CEMENT MATERIALS AND INDUSTRY. [bull. 243. 
Batesville quadrangle. At the base of the hill on each side of the 
creek are from 100 to 200 feet of Izard limestone. The bottom of 
the bed is not exposed. At some places the limestone outcrops in 
solid continuous layers, while at others the surface is covered with 
more or less regular rectangular blocks, the result of weathering. 
The position of the stone for quarrying is all that could be desired. 
In the eastern part of Stone County the Izard limestone is exten 
sively developed along the south side of White River. Along th 
river from a point opposite Penters Bluff to the lower end of Roun 
Bottom this limestone forms the base of the hills for a distance of 10 
to 200 feet. Up the river from Round Bottom the base of the hills i 
composed of the saccharoidal sandstone, the Izard limestone lym 
near the top. Northward the Izard limestone gradually approachei 
the tops of the hills, until it thins out and disappears entirely in the 
northern part of the count}^, being replaced by the underlying rocks. 
It is exposed in large quantities along Cagen and Dry creeks, Rocky 
Bayou, Hell Creek, and South Sylamore Creek, and in smaller quan- 
tities on North Sylamore and Livingstone creeks. 
In Searcy County the Izard limestone is not nearly so thick as far- 
ther east, as it gradually thins to the west. It occurs in considerable 
quantities along Big Spring, Bald Knob, Little Rock, Rock, Brush, 
and Bear creeks, on the south side of Buffalo River, and on the north 
side of Mill and Jimisons creeks. 
In the eastern part of Newton County a small quantity of Izard 
limestone occurs along Buffalo River, the most western outcrop noted 
being in sec. 26, T. 16 N., R. 21 W., about 1 mile below Jaspar. 
THICKNESS OP IZARD LIMESTONE. 
The Izard limestone has its maximum thickness on White River at 
Penters Bluff, Izard County. Here 285 feet are exposed, and the bed 
extends below the level of the river, so that the total thickness can i 
not be ascertained. From this point it gradually thins eastward to 
R. 4 W., in Independence County, and westward to R. 18 W., near 
the western border of Searcy County. It thus has an east- west extent 
of more than 80 miles. The limits of its exposure north and south 
vary from 3 to 10 miles, depending upon the topography. At Rocky 
Bayou its thickness is 160 feet; at Roasting Ear Creek, 150 feet; at i 
St. Joe, 150 feet; on Jimisons Creek, southwest from St. Joe, 50 feet; 
at Penters Bluff, the lowest exposure on White River, it is 285 feet, 
while in sec. 26, T. 15 N., R. 10 W., opposite the lower end of Round 
Bottom, it is 130 feet. The limestone extends much farther up the 
river and ends somewhere between the mouth of Livingstone Creek 
and Rappied Branch. On the east end of the river bluff, above the 
mouth of Hidden Creek, the limestone is 250 feet thick. 
