130 THE CLAYS OF ARKANSAS. 
south base of the range of mountains connecting Magazine Moun- 
tain with Mount Nebo in Yell County. Northeast of the town of 
Magazine these shale beds run northeastward for about 7 miles 
and then bend abruptly westward to the gap between Brushy Moun- 
tain and Calico Mountain. From this point they extend both east 
and west, with narrower outcrops. The outcrop to the east extends 
around the north base of Magazine Mountain and then around the 
base of Huckleberry Mountain, Three Knob Mountain, Spring 
Mountain, and Mount Nebo. Where the shale beds run around 
the north sides of the bases of these mountains they are either 
nearly horizontal or have a gentle southward dip and pass beneath 
the mountains, to appear again to the south of them. North of 
the mountains the rocks are folded, passing over an anticline and 
then dipping northward. The shale therefore appears again north 
of the anticlinal fold across the entire east-west length of Logan 
County. 
Starting in Yell County northeast of Mount Nebo the same shale 
underlies Dardanelle Ridge and extends along the south side of its 
western continuation in Pine Ridge as far as Wildcat Mountain, 
around which it passes, and runs along the north side of Brushy 
Mountain until it joins the outcrop in the gap east of Brushy Moun- 
tain. Another area of this shale lies between the village of Prairie 
View and Shoal Creek Ridge, in T. 8 N., R. 24 W. It is only about 
5 miles long and less than 2 miles wide. The length of the outcrop 
of this great body of shale in Logan County thus aggregates fully 
150 miles. 
'In Logan County there is a shale associated with the coal found 
near Blaine post-oilice and the village of Shoal Creek and extending 
thence eastward in Yell County. This same shale horizon runs along 
the south side of Snake Ridge in T. 8 N., R. 24 W. 
The shales in the rolling country at Paris and farther west, to 
the county line as well as farther east, about Spielersville and Ells- 
worth, and farther north, to Roseville, belong to an overlying series 
of rocks associated with the upper coal beds. On the south side 
of Short Mountain these shales and the coal dip northward and 
pass completely beneath that mountain, rising to the surface again 
on the north side. On the sides of Short Mountain thick beds of 
shales are exposed. The geology of Little Short Mountain is the 
same as that of Short Mountain. The rocks pass beneath it, so 
that these two mountains stand in synclinal folds, whose beds are 
largely composed of clay shales. 
It is evident that the Carboniferous clay shales cover an enor- 
mous area in Logan County. Unfortunately, no practical tests 
have been made of these shales, but in so far as the appearance 
of the materials can be depended upon they are almost everywhere 
