OF ARKANSAS. 



1*20 



JOHNSON COUNTY. 



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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 is doubtless implicated ; but the state of the opening prevented me 



from making an observa- 

 tion for dip in the drift. 



The annexed section 

 exhibits the position of 

 this coal, and its relation 

 with the associate beds. 

 On Spadra creek, no- 

 thing lower than the up- 

 per layers of flagstones 

 can be seen ; but on the 

 north bank of the Ar- 

 kansas river, under E. B. 

 Alston's house, the con- 

 tinuation of these flag- 

 stones can be observed, 

 resting on indurated, ar- 

 gillaceous shale, with 

 hard bands of sandstone, 

 extending down to low 

 water of that stream,. as 

 shown in the lower part 

 of the preceding section. 



20 



Dark, argillaceous shale, with scales of mica, 

 and containing segregations of an indurated 

 material, similar to the matrix. 



10 



Flagstones. 



Three feet coal with clay parting; fireclay? 



Indurated shale. 

 Band of sandstone. 



Indurated grey argillaceous shale, with hard 

 band. 



* For further remarks on this county, see the Report of the Assistant Geologist. 



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