OF ARKANSAS 



217 



c I 



l o l 



c I c 



c I c 



c c 



JL C _L 



c c 

 c c 



TVT 



•ISO 



lomerate and millstone grit, with intcrca- 

 id shale and schistose sandstone, 480 feet 

 in thickness — Coutiuued. 



20 Black entrochitil limestones. 



q ? Place of dark shales, usually under the black 

 limestone. 



180 



Buff-colored fossiliferous sand-tone, with inter- 

 calated, dark shale; lower part thin-bedded 

 and schistose. 



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 rich in 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 (i) 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 millstones. 

 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 count)'. 



The black limestone 

 (//) belongs t > ihe sub- 

 carboniferous limestone 



