T. H. Aldrich — Tertiary of Alabama. 307 



Smith has confirmed this, and is now engaged in completing 

 his observations. 



A locality north of Barrytown, Ala., at and in the vicinity 

 of a mill spoken of by Tuomey,* furnishes another section from 

 the Lisbon beds up to the White Limestone, a small patch of 

 which is left on top of Womac hill. The bed at the mill con- 

 tains : 0. sellceformis Con., very large and fine; Teredo — n. s. ; 

 Scalpellum Eocense Meyer ; Pecten Deshayesii Lea, and corre- 

 sponds with the bed (b) of Dr. Meyer's section. Winchell's 

 statement that this bed is not found elsewhere is disproved. 



The species described by Conradf which were received from 

 Dr. Spillman in which he gives the locality ''Enterprise, Miss.,' r . 

 Dr. S. writes me (Aug. 14, 1884) were not found there ; he 

 says: "I have no recollection of sending T. A. Conrad any 

 fossils from near Enterprise. I sent him some from Garland's 

 Creek, three miles east of Shubuta, Miss., in the southern part 

 of Clark County." This removes one question, as these shells 

 are undoubtedly Jacksonian and Dr. Meyer is no doubt correct 

 in calling the beds at Enterprise Claibornian. 



One more point remains to be quoted, and this is, that the 

 crystalline limestone of the Vicksburg group has never been 

 found in Alabama below the Claiborne sand, while crystalline 

 limestone over 150 feet thick shows above it. 



Eeviewing Dr. Meyer's summary of reasons: 



1st. He speaks of the lower limestone, which is not a lime- 

 stone ; also sections already given show beyond question that 

 Lyell was correct in his general statements. 



2d. This is no argument whatever ; differences in level of 100 

 feet between points nearly 100 miles apart have no strati- 

 graphical value. If the general dip is southerly in Alabama 

 and southwest to west in Mississippi, all the beds are sure to 

 outcrop at the surface somewhere. 



3d. The Jackson group in Mississippi presents a mixture of 

 Vicksburg and -Claiborne forms, and this very fact is a strong 

 argument in favor of its true position, being between the two 

 groups. Milra pactilis Con. is common at Jackson as M. 

 dumosa Con., yet it also is found at Lisbon, still lower than 

 Claiborne sand by 100 feet. The relationship is therefore to 

 be largely widened. 



4th. V. parva Lea has a still larger range, probably through 

 1000 feet of strata. 



5th. Venericardia diversidentata Mr., from Jackson, is nothing 

 more nor less than V. rotunda Lea. Conrad at one time evi- 

 dently considered it new, as he gives a name in "Wailes (Geol. 

 of Miss.) " Cardita tetrica^ but afterward abandons it. This 



* 1st Kept., p. 148. He also mentions finding 0. Selksformis Con. here. 

 f Am. Jour, of Conchology, 1865, vol. i, p. 137. 



