If L39, 140] FOSSILS OP RIPLEY GROUP. 95- 



Species common to the Upper and Lower Cretaceous. 



(Conead & Gabb, Jour. Acad. Nat. Se. Phila. Vol. IV n. s., p. 275 . 



Pholadomya occidentalism Mort., Tippah, Now Jersey. 



Dosinia excavata (Cytkerea), In., 



Fragilia elegantula {Cardium), Rof.m., Texas: 



F protexta, Con. 

 Gardiwm Spillmani, Con., 

 Trigonia thoracica, Mort., 

 Pycnodonta vesicularis {GrypJiaea), Lam., 

 Gervillia ensiformis, Con., 

 Exogyra cost da, Sat, 

 Pinna bicarinnta, Math., Eufaula, 



P. laqueata, Con., 

 Axinaea (Pectunculus) australis, Mori'., 

 Meretrix Tipp ma, Con , " 



Gtenoides pelagica {Lima), Mort., " 



Crassatella vadosa, Mort., Eufaula, " " 



0. lintea, Con., 



Barbatia nniopsis, Con., " :c 



Pecten Burlingtonensis ? Gabb, " " 



Anemia argentaria, Mort., " " 



Turritella vertebroides, Mort., i: 



Meus octoliratus, Con., :: 



Turbinopsis Ililgardi, Con., 

 Nautilus DeJcayi, Mort., " 



Baculites carinatus, Mort., " 



B. Spil! mani , Con., 

 Solenoceros annulifer, " 



Ilamites annulifer, Mort., 

 Vermetus {Hamulus') onyx, Mort., " 



USEFUL MATERIALS OF THE CRETACEOUS FORMATION. 



140. These consist essentially of Marls or mineral fertilizers,. 

 Limestones, and Building Stones. It is probable also that among 

 the materials embraced in the two former classes, some will be 

 found to possess hydraulic properties. 



Marls. — No material deserving the name of marl, occurs within 

 the Eutaw Group. 



Tomb'gbee Sand. — The micaceous sands of this group in some 

 localities are sufficiently calcareous to render its use as a fertilizer 

 profitable, especially as lime is generally very deficient in the soils 

 which it underlies. In Tishomingo county, the materials occurring 

 at Boyer's mill ("II 11) and on lower Big Brown's Creek generally, 

 deserve attention and trial ; none of them will, however, bear much 

 transportation, nor should they be applied to soils already very 

 sandy. The greenish calcareous sand of Dr. Tindall's bluff, near 

 Aberdeen ("111 3), has been used with advantage by that gentleman. 

 Similar deposits occur in many localities along the Tombigbee at 

 and below Aberdeen ; at Barton (1 107) ; and at Plymouth Bluff 

 (1114). 



