OF ARKANSAS 
217 
Feet. 
Conglomerate and millstone grit, with interea- 
lated shale and schistose sandstone, 480 fect 
in thickness—Continued. 
Black entrochital limestones. 
limestone. 
Buff-colored fossiliferous sandstone, with inter- 
calated, dark shale; lower part thin-bedded 
and schistose. 
Place of dark shales, usually under the black 
with the intermediate 
members, 
The coarse ferruginous 
sandstone (j) is seen, in 
many places in the east- 
ern part of Independence 
county, resting, usually, 
on the buff sandstone (/’). 
At some localities, it is 
very richin iron ore; but 
too much mixed with 
sand to admit of its being 
used, profitably, as an 
ore for the manufacture 
of iron. 
The conglomerate or 
millstone grit (7) was not 
seen on the north side of 
White river, but makes 
its appearance in the 
southern part of the 
county, near Rocky Point 
post-office, where it con- 
tains embedded pebbles: 
This rock has been quar- 
ried, and is held in good 
repute for rnillstones. 
Though not more than 
fifty or sixty feet in thick- 
ness at the above locali- 
ty, on the south side of 
Salido creek it increases, 
with its associate shales, 
to four hundred and 
eighty feet. I have not 
observed any coal asso- 
ciated with these rocks 
in this county. 
The black limestone 
(h) belongs t» he sub- 
carboniferous limestone 
