OF ARKANSAS. 



239 



MG 



Millstone grit, 200 feet in thickness — Continued 



i i i i 





S B 



HIT 



s s 



15 



40 



30 



Siliceous and argillaceous Bhales, with thin 

 bands of hard rock. 



Fhin-bedded soft sandstone. 



Hard shale. 



200 



Argillaceous shale, traversed by metallic reins. 



The underlying silice- 

 ous and argillaceous 

 shales (d) are exposed, 

 in section, on the Arkan- 

 sas river, near Mr. Ir- 

 v in's, at Pal arm bayou; 

 as well as on Bull bayou, 

 in the north-east part of 

 Conway county. It is 

 through them that the 

 veins of quartz reach the 

 surface, on the property 

 of Dr. Lewis, in Con- 

 way county, and near 

 Mr. Irvin's in Pulaski 

 county. Locally, a bed 

 of soft sandstone (c) is 

 intercalated amongst 

 these shales, succeeded 

 by thirty feet of hard 

 shale or slate, (b), inter- 

 sected with lines of cross 

 fracture, probably caus- 

 ed by shrinkage. 



The lowest stratum (a) 

 of this section comprises 

 the shales forming the 

 valley of Kellogg creek, 

 which are traversed by 

 a system of metallifer- 

 ous veins, containing a 

 rich silver-lead, associat- 

 ed with quartz, talc, (tal- 

 low rock of the miners), 

 copper pyrites, spathic 

 iron, and blende. The 

 principal veins have a 



course nearly cast and west. At the Kellogg mines, metalliferous veins 

 are found, occupying a belt of country from north to south, cf more than 

 half a mile, and the whole system of quartz veins and tilted strata, of 



