REPORT OF THE STATE PALEONTOLOGIST I903 



185 



quite heavily bedded ; in other places it becomes very shaly ; this 

 latter condition is specially noticeable near the middle of the forma- 

 tion. It is divided into an upper (150 feet) and a lower (30 feet) 

 division on faunal grounds entirely. 



Lower Oriskany (Dalmanites dentatus zone) 



FAUNA OF THE LOWER ORISKANY 



Vermipora serpuloides Hall (H) c^ 

 Beachia suessana Hall (O) R-c 

 Chonostrophia jervisensis Schiich. 



Cyrtina rostrata Hall (O and On) r 

 Dalmanella subcarinata Hall (H) 



R-C 

 Leptaena rhomboidalis (IVilck.) 



(Trenton-Waverly) R-c 

 Leptostrophia oriskania Clarke (O) R 

 Meristella lata Hall (O) r 

 Nucleospira elegans Hall (Niagara- 



H) c 

 Orbiculoidea ampla Hall (O) r 

 Orthothetes woolworthanus Hall 



(H) c 

 Rensselaeria aequiradiata (Con.) 



(H) R 

 R. subglobosa Weller c-C 



Rhipidomella oblata Hall (H) r 

 Spirifer murchisoni Castel. (O) r-c 

 Stenochisma formosa Hall (H) r 

 Strophonella? conradi Hall (H) r 

 Uncinulus vellicatns Hall (H) R 

 Actinopteria textilis (Hall) (H) 



R-C 

 A. textilis arenaria (Hall) (O) R 

 Diaphorostoma nearpassi (Weller) R 

 D. ventricosum (Con.) (H and 



O) R 

 Loxonema jerseyense Weller ?-c 

 Platyceras platystoma Hall (H) r 

 P. ventricosum Con. (H and O) R 

 Tentacnlites actila Hall (H) r-c 

 T. elongatus Hall (H and O) r 

 Dalmanites dentatus Barr. R-C 

 D. dolphi Clarke R' 

 Homalonotus vanuxemi Hall (H) c 



Out of the above fauna of 30 species, 6 have so far been found 



only in these beds, 4 occur in both Helderbergian and Oriskanian, 



13 are Ilelderbergian and 7 are Oriskanian species. CJmitting from 



the consideration all that are very rare (R), there are present 11 



Helderbergian and 5 Oriskanian species, which vary in number 

 I- — — 



^R^very rare; r^rare; c=^common; C=vei-y common. H=Helderbergian ; 

 0=Oriskanian ; On=Onondagan species. ?=species doubtful. When no hori- 

 zon is given, the species has been found in the beds of this region only (i. e. 

 ■northwestern New Jersey and southern New York). 



^Schuchert notes the occurrence of the species in the Becraft of the Port 

 Jervis region. Am. Geol. 27:250. 



^Described from these beds but not seen by me. 



