CORRELATIONS OF THE LOWER COBLENZIAN 



267 



3. Loiver Coblenzian, zone of Spirifer hercynix 



Coblenzian. 



Orthi.s hysterita Grim. 

 Orlhis circularis Sowerby. 

 Strophomena plicala Sowerby. 

 Strophomena explanata Schnur. 



Chonetes sarcinulatus Sehlotheim. 



Gionetes dllatatus de Koninck (probably 



Stropheodonta). 

 Chonetes plebeus Schnur. 

 Rhynchonella daleidensis F. Roe.mer. 

 Rhynchonella dannenbergi Kayser. 



Rhynchonella ( Wilsonia) pita Schnur. 

 Spirifer subcuspidatus Schnur. 

 Spirifer carinatus Schnur. 



Spirifer hercynix Giebel. 

 Spirifer arduensis Schnur. 

 Athyris ilndata Def ranee. 



A thyris ferronemis Verneuil. 

 Anoplotheca venusta Schnur. 

 Megalanteris archiaci Verneuil. 

 Rensselseria strigiceps F. Roemer. 

 Tropidoleptus rhenanus Freeh. 

 Numerous pelecypoda. 

 Few gastropods. 



Homalonotus armatus Burmeister. 

 Homalonolus rhenanus C. Koch. 

 Homalonotus ornatus Sandberger. 

 Homalonotus roerneri. 



American. 

 0. (Schizophoria) strialula. 



Stropheodonta (Leptostrophia) magnifica 



Hall. 

 C. melonica Billings and C. coronatus 



Conrad. 



Nothing like it. 



Freeh compares R. multistriata Hall. 

 (Of the Oriskany.) 



Nothing like it. 



S. fomacula Hall, S. medialis Hall. 



Similar with the Hamilton S. granulifer 

 Conrad. 



'S. cumberlandia Hall. 



S. duodenaria Conrad. 



The nearest is the Hamilton A. spiri- 

 fer vides (Eaton). 



Nothing like it. 



Freeh compares R. ovoides (Eaton). 



No spiniferous American species. 



H. vanuxemi Hall. 



No ornate American species. 



This fauna does not readily correlate with any American horizon. 

 Freeh, however, says " the Lower Coblenz strata, consisting of grauwacke 

 and slates with interbedded quartzites, form in a developmental aspect 

 an unchanged continuance of that of the Siegen grauwacke."* This 

 horizon is apparently not far removed from the later Oriskany and may 

 be the equivalent of that and the Cauda-galli. 



4. Upper Coblenzian, zone of Spirifer paradoxus 



The fauna here is a very extensive one, and if the American reader will 

 look at Freeh 'sf plate 246 he will not hesitate to pronounce the age of that 



*Lethsea geognostica, 1897, p. 146. 

 f Ibid. 



