DETAILS OF STRATIGRAPHY 373 



(1) (2) 



Platystrophia reversata Foerste X X 



Plectambonites cf. transversalis var. elegantula Foerste x X 



Schuchertella sp . . X 



Spirifer radiatus Sowerby X 



Stricklandinia triplesiana Foerste X X 



Stricklandinia sp X X 



Stropheodonta sp X 



Strophonella fllistriata Foerste X X 



Strophonella cf. roemeri Foerste X 



Triplecia ortoni Meek X X 



Whitfieldeila sp X 



Diaphorostoma niaga/rense (Hall) X X 



AmphicoBlia cf. leidyi Hall X 



Dawsonocerax sp X 



Orthoceras sp X X 



Bronteus acamus Hall X X 



Ceraurus cf. niagarensis Hall X X 



Encrinurus sp X X • 



Illwnus anibiguus Foerste X X 



Illamus cf. daytonensis Foerste X 



Illwnus madisonianus Whitfield X X 



Illcenns sp X X 



In the above list the greater number of fossils to which no specific 

 names are given are new. The similarity of the faunas of the Sexton 

 Creek limestone in the vicinity of Hamburg and below Custer Park along 

 the Kankakee River indicates that the strata at the two localities are 

 equivalent. 



The presence in the Sexton Creek limestone of such characteristic 

 Brassfield species as Clathropora cf. frondosa, Rhinopora near verrucosa. 

 CamarotaicJiia acinus var. convexa, Strophonella fllistriata, Stricklan- 

 dinia triplesiana and Tripecia ortoni indicates that the Sexton Creek 

 limestone in the Mississippi Valley represents about the same general 

 period of deposition as the Brassfield limestone, east of the Cincinnati 

 axis, in Ohio. 



( i bneral Conclusions 



Tt should be noted thai ihe fauna of the Sexton Creels limestone in the 

 Mississippi Valley lacks several species dial are presenl in the Brassfield 

 limestone in Ohio, such as Pachydictya bifurcata, Phcenopora magna, 

 Camarotoechia f scobina, Dalmanites werthneri, and Cyphaspis cHntonen- 

 sis. A number of fossils not found in the Brassfield limestone east o\' 



(lie Cincinnati anticline are present in the Sexton Creek limestone of 

 Illinois and Missouri, among which are Callopora n. sp., Rhinopora n. sp.. 

 Pentamerus oblongus, Spirifer radiatus, Stricklandinia n. sp., Amphi- 

 ccelia cf. leidyi, and I ironic us acamus. 



