On the Nummulite Limestone of Alabama. 



191 



costata, Con., and a few others common to Claiborne; but the 

 great bulk of the associate fossils do not agree specifically with 

 those of Claiborne bluff. I found these distinct species at Vicks- 

 burg to be referable to the genera Voluta, Conus, Terebra, Fusus, 

 Vlurex, Cassis, Pleurotoma, Oliva, Solarium, Natica, Turritella, 

 Corbula, Panopsea, Crassatella, Lucina, Venus, Cardium, Area, 

 Pinna, Pecten, and Ostrea, with several corals, the whole having 

 a decidedly tertiary and eocene aspect. The genus Pleurotoma, 

 for example, which is represented by several species, is one of 

 the forms most characteristic of tertiary as distinguished from 

 secondary formations. 



M ssip- Vicks- 



Fig. 2. 



pi Uiver. 



burg. 



Jackson. Pearl River. 



1. Mud of alluvial plain of Mississippi.— 2. Superficial drift, 

 loam with land shells. 



Eatt 



fifty miles. 



4. Eocene strata. — 5. Cretaceous strata 



-3. Freshwater 

 Length of section 



At Jackson, which, as before stated, is more than forty miles to 



the eastward, eocene beds, older than those of Vicksburg, crop 



out near to the area occupied by cretaceous deposits, as at 46, 



wood-cut, (No. 2. ) Here on the Pearl river I found no specimens 



ox Orbitolites Mantelli, although some are said to have been met 



with in the vicinity. But I observed that a larger proportion 



among the fossils, were specimens common to Claiborne bluff, 



than at Vicksburg. Among these may be mentioned Cardita 



planicostata, Cardita rotunda, Cytherea asquorea, Natica, like one 



which I obtained at Claiborne, Flabellum cuneiforme, Lonsdale, 



and Endopachys alatum, Lonsd., (Turbinolia Maclurii of Lea.) 



these I found in strata of yellow loam, sand, and marl, on the 



J earl river and in the banks and bed of one of its tributaries. 



J he other shells collected by me at the same place, several of 



them I believe identical with Claiborne species, belong to the 



genera Voluta, Oliva, Terebra, Rostellaria, Murex, Plurotoma, 



^mbrella, Natica, Turritella, Crepidula, Dentalium, Corbula, 



^^tra, Lucina, Cytherea, Cardium, Cardita, Pectunculus, No- 



eula, Pinna, Pecten, and Ostrea. With these are corals, teeth of 



J?* 1 ' &c - I was shown the remains of a Zeuglodon procured from 



ne neighborhood, at a place five miles south of Jackson, on the 



W bank of the Pearl river, but as I did not visit the locality I 



an not point out the precise place in the eocene series which it 



°<*upies. ~ t 



* e same specifically as those occurring with the shells above 

 Jtentioned at Jackson, and one of my informants stated that this 

 ^"glodon bed was immediately under "the rotten limestone." 



Some of the accompanying corals, however, were 



^"don, June 18, 1847. 



