FAUNA OF SIEGEN GKAUWACKE 



259 



Germany. 



Rhynchonella pengelliana Davidson. 

 Tropidoleptus rhenanus Freeh. 

 Rensselxria strigiceps F. Roemer (not a 

 Rensselaeria, probably a pentameroid). 

 Rensselseria crassicosta Koch. 

 Megalanteris archiaci. 

 Palseopimia gigantea Krantz. 

 Numerous pelecypoda. 

 Platyceroids rare. 

 Homalonotus ornatus C. Koch. 

 Homalonotus planus Sandberger. 

 Homo lonotus roemeri de Koninck. 

 Homalonotus aculeatus 0. Koch. 

 Phacops ferdinandi Kayser. 

 Dalmauia ( Odontocheile) rhenana Kayser. 

 Cryphseus limbatus Schliiter. 



Many crinoids and starfishes. 

 Tentaculites grandis. 



American. 



Camarotxchia speciosa (Hall). 



M. oralis Hall. 

 P. flabellum Hall. 

 Pelecypoda rare. 

 Platyceroids common. 



H. major Whitfield. 

 H. vanuxemi Hall. 



P. cristata Hall. 



D. (0.) pleuroptyx (Green). 



American species of Cryphseus begin 



in the Middle Devonic. 

 Crinoids rare ; starfishes none. 

 Tentaculites acuta Hall. 



In this fauna there is marked evidence for purposes of correlation. 

 Brachiopods are numerous and often of large size, a degree of develop- 

 ment also attained in the American Oriskany. The principal American 

 species of this horizon and their equivalents in the Siegen grauwacke are 

 shown as follows : 



American. 



Stropheodonta magniventra Hall. 



Camarotcechia speciosa Hall. 



Crytinarostrata Hall and C. affinis Billings. 



Spirifer murchisoni Castelnau. 



Spirifer arenosus Conrad. 



Meganieris ovalis Hall. 



Palxopinna flabellum Hall. 



Dalmanites {Odontocheile) pleuroptyx Green. 



Tentaculites elongatus Hall. 



Siegen. 



Strepiorhynchus gigas McCoy. 

 Rhynchonella pengelliana Davidson. 



C. heleroclita Defiance. 

 S. primxvus Steininger. 



A poor representative in S. bishofi Giebel. 



M. archiaci. 



P. gigantea Krantz. 



D. (0.) rhenana Kayser. 

 T. grandis. 



From this evidence and the further fact that zone 3, or Lower Coblen- 

 zian, does not clearly indicate the Oriskany, but a rather higher horizon, 

 it follows that the Siegen grauwacke and the American Oriskany are 

 fairly harmonious in their faunas. Freeh correlates the Oriskany with 

 the " Spirifer sandstone " of the Lower Coblenzian. This view places the 

 Oriskany near the top of zone 3 (see page 266), a considerably higher or 

 younger position than that given by the present writer. 



Again, if the Hercynian fauna of the Lower Wieder Schiefer, described 



