OF ARKANSAS. 129 
JOHNSON COUNTY. 
My own observations in this county, have been confined, as yet, to the 
coal regions of the Spadra.* 
The best locality for the examination of the Spadra coal, is a few 
» hundred yards above the confluence of Spadra creek with the Arkansas 
river, on the property of E. B. Alston. An opening has been made there 
into this coal, a foot.or two above low water, where it can be seen under 
a high bank of dark shales and over flagstones, which appear in the bed 
of Spadra creek, with, probably, some intervening fire-clay which could 
not, however, be seen, in consequence of the water that had collected in 
the drift. This coal is three feet thick, including a clay parting of 3 to 4 
inches, one foot from the bottom of the bed. The underlying flagstones, 
in the bed of Spadra, dip from 3 to 5 deg. to the north, in which dip 
the coal i is doubtless implicated ; but the state of the opening prevented me 
from making an observa- 
tion for dip in the drift. 
Feet. 
Inches. 
The annexed section 
exhibits the position of 
this coal, and its relation 
Dark, argillaceous shale, with scales of mica, with the associate beds. 
20 and containing segregations of an indurated On Spadra creek, no- 
>] 
material, similar to the matrix. : 
thing lower than the up- 
per layers of flagstones 
ie ate | can be seen; but on the 
3 } rare feet coal with élay parting; fireclay? north bank of the Ar- 
kansas river, under E. B. 
jl Alston’s house, the con- 
Fl aa) tsetienas tinuation of these flag- 
| stones can be observed, 
| resting on indurated, ar- 
emma: gillaceous shale, with 
ED 
Indurated shale. hard bands of sandstone, 
extending down to low 
water of that stream, as 
---- 5| |Indurated grey argillaceous shale, with hard shown in the lower part 
pene of the preceding section. 
sss 8 Band of sandstone. 
* For further remarks on this county, see the Report of the Assistant Geologist. 
9 
