REPORT OF THE STATE PALEONTOLOGIST I903 



189 



FAUNA OF THE UPPER ORISKANY 



Coelospira dichotoma Hall (O) 



r-c 

 Leptocoelia flabellites (Con.) (O and 



On) r-c 

 Beachia suessana Hall (O) R 

 Chonostrophia complanata Hall (O) r 

 Dalmanella subcarinata Hall (H) r 

 Megalanteris ovalis Hall (O) ? 

 Meristella lata Hall (O) r-C 

 Orthothetes woolworthanus Hall 



(H) C 

 Reticiilaria modesta (Hall) (H) r 

 Spirifer arenosus (Con.) (O and 



On) ? 

 S. cyclopterus Hall (H and O) R 



S. murchisoni Castel. (O) r-C 

 Stropheodonta becki Hall (H) r 

 Actinopteria textilis arenaria (Hall) 



(O) c 

 Pterinea? gebhardi (Con.) (O) r 

 Diaphorostoma desmatum Clarke 



(O) r 

 D. ventricosum (Con.) (H and O) 



r-C 

 Platyceras lamellosum Hall (H) R 

 P. reflexum Hall (O) ? 

 Coniilaria pyramidalis jervisensis 



Shinier r 

 Tentaculites elongatns Hall (H) r-C 



Out of a fauna of 21 species, one was found in the beds of this 

 region only, two are equally characteristic of the Helderbergian and 

 Oriskanian, six are Helderbergian and 12 Oriskanian. Omitting 

 from consideration all questionable and very rare species, there re- 

 main 5 Helderbergian and 8 Oriskanian species. 



From the abundance of such typical Oriskany species as Lepto- 

 coelia flabellites, Coelospira dichotoma, 

 Chonostrophia complanata, Meristella lata, 

 Spirifer murchisoni and Actinopteria textilis 

 arenaria there is no doubt that these beds should be placed in 

 the Oriskany. Although the Helderbergian forms occurring here 

 are not very typically such, yet they indicate a j)ersistence of Helder- 

 bergian species in this region to the beginning of the Esoidus, for in 

 the uppermost Oriskany beds occur such Helderbergian forms as 

 Stropheodonta becki, Reticularia modesta and 

 Tentaculites elongatus side by side with Spirifer 

 murchisoni, Meristella lata and Leptocoelia 

 flabellites. Yet the larger and specially characteristic fossils 

 of the typical Oriskany as developed at Oriskany Falls, are mostly 

 wanting in these beds. Rensselaeria ovoides, Hip- 

 parionyx proximus and Camarotoechia bar- 



