and South Central Pennsylvania. 



423 



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Carlim < 



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Cancellospongia n. sp ("0")* . . 



Streptelasma profundum (IJ) . . 



Columnaria n. sp (U) . . 



Tetradium cellulosum (L-U) . . 



Tetradium syringoporoides .... (L-U) . . 



Cryptophragmus antiquatus (U) . . 



Rafinesquina minnesotensis (L) . . 



Protorhyncha ridleyana (L) . . 



Zygospira recurvirostris (U) . . 



Pterotheca sp (U) . . 



Liospira vitruvia. (L) . . 



Liospira progne (L) . . 



Thaleops sp (U) . . 



Pterygometopus callicephalus . . . . (U) . . 

 Leperditia fabulites (L-U) . . 



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* L stands for lower and U stands for upper Carlim . 



On strictly faunal data the lower Carlim should be 

 correlated with the Pierce and the upper Carlim with the 

 Lebanon and Carters Creek formations in Tennessee. 

 Columnaria n. sp. and one or two peculiar sponges 

 recently discovered are particularly important horizon 

 markers. 



It can now be definitely stated that the typical Leray- 

 Black River does not occur in the central Pennsylvanian 

 province. 



The thin zone of slightly less pure limestone which 

 occurs above the Valentine and thickens appreciably to 

 the east is neither f aunally nor lithologically particularly 

 different from the Carlim except that it does not contain 

 Tetradium. Were it not for its separation from the 

 Carlim, at Bellefonte, by the intermediate zone of the 

 Valentine, there would be difficulty in distinguishing it 

 from the lower formations. 



The recent discovery of the peculiar faunal zone which 

 occurs between the Center Hall and the Salona, and 

 which Butts has named Rodman, introduces an entirely 

 new element into the discussion of the correlation of the 



