OF ARKANSAS. 



209 



-frr 



20 



Compact magnesian limestone, with casts of 



orthis. 



Light buff, impure magnesian limestone, with 

 conchoidal fracture. 



Gray thick-bedded magnesian limestone, with 

 ferruginous chert, lower part siliceous. 



Place of zinc ore. 



Thick-bedded magnesian limestone, full of 

 crevices; lead and copper bearing rock. 



pics of copper pyrites 

 found, and a similar va- 

 riety of ore was also 

 found in the same geo- 

 logical position on the 

 property of Mr. William 

 R. Williams, on section 

 32, township 17 north, 

 range G west. 



The veins of calcspar 

 in which the copper oc- 

 curs, have no constant 

 direction, where seen; 

 but it is probable that, 

 when the country comes 

 to be examined more in 

 detail, they maybe found 

 connected with some 



L L 



system of true veins. 



The principal working for lead, in these rocks, in Lawrence county, has 

 been made on the property of Mr. E. W. Houghton, six miles from Pow- 

 hatan, on section 10, township 17 north, range 2 west, where as many as 

 twenty pits have been sunk, from which between one and three thousand 

 pounds of galena have been taken out. No profitable lode was reached, 

 therefore the diggings were discontinued. Surface lead ore (" float min- 

 eral") has been occasionally picked up, over a district about one-fourth 

 of a mile in breadth, and extending several miles in a i;orth-west direc- 

 tion; but no continuous vein has so far been discovered. 



In the openings which have been made in this county, the cap rock is 

 first reached; after penetrating it, at a depth of thirty or forty feet, 

 members (a) and (b) of the preceding section are reached; in these, small 

 crevices occur, in which the lead ore is found, accompanied with clay, 

 charged with oxide of iron ("gossan"). These crevices have a bearing 

 north-east and south-west, but do not extend continuously^ any great dis- 

 tance. The abandoned shafts, at this locality, had become mostly filled 

 with rubbish, so that I had no opportunity of seeing the position of the 

 ore at the bottom. When more time can be devoted to the examination 

 of this county, a more satisfactory conclusion may be arrived at, in regard 

 to this lead region, than could be gained in the time allowed for a simple 

 reconnoissance of the country. All that can be at present stated, from 



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