OF ARKANSAS. 
239 
Feet. 
The underlying silice- 
ous and argillaceous 
bands of hard rock. 
Thin-bedded soft sandstone. 
Hard shale. 
Siliceous and argillaceous shales, with thin 
200|Argillaceous shale, traversed by metallic veins. 
shales (d) are exposed, 
in section, on the Arkan- 
MG_NG) — |Millstone grit, 200 feet in thickness—Continued,|Sas river, near Mr. Ir- 
vin’s, at Palarm 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, (8), 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 east and west. At the Kellogg mines, metalliferous veins 
are found, occupying a belt of country from north to south, of more than 
half a mile, and the whole system of quartz 
veins and tilted strata, of 
