60 THE CLAYS OF ARKANSAS. 
less sand, apparently, than any of the others. Bed No. 4 is evi- 
dently a decomposition product of the black shale that underlies 
the region about Old Lewisburg and that crops out along the river 
bank above and below the ferry. This shale contains much sand, 
and at some places, as just above the ferry, it contains beds of 
shaly sandstone. It has a dip of 25° S. Beds 1, 2, and 3 are foreign 
to this locality and are not derived from this shale bed. 
The whole site of the town of Old Lewisburg is underlain by 
the clay mentioned in the section, except where these beds have 
been cut through by gullies. Bricks have been made from the 
clay at the south edge of the town of Old Lewisburg. This clay 
has about the elevation of No. 1, but the clay exposed in the old 
pit did not show so much sand as bed No. 1 in the gully where the 
section was taken. The clay of the pit is red. These bricks are 
reported by Mr. Morloch, who helped to tear down some of the 
buildings made from them, to be soft and crumbling. No bricks 
have been made here since Old Lewisburg was in its prime, many I 
years ago. 
Clays south, of Morrillton.— The ridges south of Morrillton are each 
formed by a heavy bed of sandstone, dipping south at an angle of 
25°. Between these two sandstone ridges is a black, gritty shale, 
forming a red brick clay. The shale bed is about 275 feet thick. 
This clay resembles that of the valley in which Morrillton stands. 
The clay in this valley is found mostly on the north slope of the 
south ridge and on the south slope of the north ridge. Where the 
same clay occurs in the bottom of the valley it contains more sand 
than it does on the slopes of the ridges. 
Brick clays at Morrillton. — About 150 paces west of the public 
school building in Morrillton, on the north slope of the ridge, is a 
bed of reddish plastic clay, from which bricks have been made. 
This clay is sticky, but contains small iron "buckshot" nodules and 
is sandy, though the amount of sand is not excessive. This same 
clay bed extends all along the northern slope of this ridge, which 
is the first one south of the town. It is uniform in color and plas- 
ticity and in the amount of buckshot it contains. It is the product 
of the decomposition of the black, sandy, southward-dipping shale 
that underlies the whole valley in which Morrillton is built. This 
surface clay at no place appears to have a thickness of more than 
2 or 3 feet. The clay formerly used at W. M. Morloch's brickyard, 
a little more than half a mile east of the railway station at Mor- 
rillton, is red, contains sand and iron, and is only 1 to 2 feet thick, 
the partially decomposed underlying shale coming close to the 
surface of the ground. The shale fragments seen on the surface 
hereabout are weathered to a light-greenish color. The shale that 
forms this clay belongs to the same bed as that forming the clay 
