139 Midway Stage 25 



ritella mortoni var. , Meretrix ripleyana, Yoldia eborea^ 

 Protocardia and Enclimatoceras ulrichi; 2 to 4 feet in 

 thickness. 

 e. Nearly barren clay; perhaps 20 feet. 

 /. A repetition of bed d. 

 g. Clay as in bed e. 



Pontotoc and vicinity. — Material of the same general appearance 

 occurs in the highway from i to 2 miles west of Pontotoc; but owing 

 to a slight indisposition on the part of the writer the day that was 

 allotted to its examination, no collections of fossils were made. 

 The exposures in the immediate vicinity of the station carry a 

 typical upper Cretaceous fauna. 



Alabama. 



Black Bluff. — This bluff according to Smith and Johnson is in 

 S. 12, 16 N., I W. (Bull. 43, U. S. Geol. Surv., 1887, p. 61). It 

 is in places about 70 feet high, but as a rule furnishes few and 

 imperfect molluscan remains. The specimens collected by the 

 writer upon first visiting the locality are now in the State 

 Museum at Austin, Texas. They contained a few forms more 

 perfect than those obtained during last summer's visit, and owing 

 to the absence of the State Geologist from Austin they are inac- 

 cessible at present. Our collection however shows Enclimatoceras 

 ulrichi, Cucullcea macrodo?ita , Yoldia eborea, Nucula niediavia, 

 Meretrix (large, fragment), Tornatellcsa bella, Volutilithes rugatus, 

 Levibuccifitmi li^ieatuni, Mitra hatchetigbeensis? , Olivella niediavia, 

 Natica, Pleurotonta, Dentalium and other less determinable frag- 

 ments. 



The black clays so characteristic of this exposure and general 

 horizon continue on down the river for several miles, often fur- 

 nishing a few well preserved fossils but never abundantly. At a 

 locality about 4 miles below the bluff we collected Enclimatoceras 

 ulrichi, Cucullcea macrodonta, Yoldia eborea, Volutilithes rugatus 

 var. somewhat like saffordi, Olivella mediavia and many fragmen- 

 tary specimens. 



Among the molluscan remains in these Black Bluff clays one 

 observes an abundance of coral and crab remains. One inorganic 

 structure attracts attention on account of its pisolitic, light gray 

 appearance. Dr. Gill of this University on testing one of these 

 peculiar substances pronounced it Barite (Barium sulphate). 

 Gypsum crystals are common in the clays; and springs which 

 issue in abundance from many of the exposures are generally 

 very sulphurous and their waters impotable. 



Naheola. — Farther down the Tombigbee, at Naheola the black 

 clays reach the water's edge, and the ferruginous green sand 



