lo Bulletin 9 202 



6. Hard, fossiliferous sand-stone 3 feet 



7. Indurate sandy clay, fossiliferous 5 feet 



8. Indurate greenish sand, containing one or two stra- 



ta of sandstone 20 feet 



Total 80 feet 



The most characteristic species are : Calyptraphorus trino- 

 diferus, Cornulina armigera, Volutilithes petrostis var. tuomeyi, 

 Corbula, probably a var. of alabamiensis , Leda alirichiana, 

 Madra var. bistriata, Sigaretus bilix, ''KelHa'' prima, Natica^Tel- 

 lina, and a large Cardiuin not yet described. 



I/Ouisiana. 



References : — Report on the Iron Ore Region of La., and Eastern 

 Texas, House Doc. No. 195, 50th Congress, ist Ses. 

 1888, — 'Johnso7i. Ann' I Rept. Ark. Geol. Sur. 

 i8p2, vol. ii, p. 181 , — Harris. Americafi Geolo- 

 gist, vol. 15, p. 2og , i8g^, — Vaughan. Bull. 142, 

 U. S. Geol. Sur. p. i§, 18 p6, — Vatighan. 



The northwestern corner of this State may be occupied by 

 lyignitic deposits as indicated on the map accompanying my 

 report on the Tertiary Geology of Southern Arkansas ; vol. ii 

 as given in the references. All molluscan remains of the Lower 

 Claiborne stage seem to die out a few miles north of Plaindeal- 

 ing. These unfossiliferous beds were supposed by me to be the 

 continuation of similar deposits in Arkansas, which I referred 

 to the Lignitic. 



Arkansas. 



References : — Trans. Avier. Philos. Soc, vol. i, New Ser. 18 17, 

 — Machire. Jour. Acad. Nat. Sci., vol. ii, pp. 45— 

 46, — Nuttall. Carte Geologique des Etats-unis et 

 des Provinces Anglaises de /' Amerique du nord, 

 i8j8, — Marcou. Second Rept. Geol. Reconn. Ark., 

 i860, — Ozven. Jour, Acad. Nat. Sci. 2nd Ser., 

 vol. 9, pi 4, — Heilprin. Ann'' I Rept. Geol. Sur. 

 Ark., 1888, vol. ii,—Hill. An7iH Rept. Geol. Snr. 

 Ark., 1892, vol. i, pp. io^-ij8, — Penrose. Ann'' I 

 Rept. Geol. Sur. Ark., 1892, vol. ii, — Harris. 



