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 loAver (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 Schuch. 



r-a 



Cyrtina rostrata Hall (O and On) r 

 Dalmanella subcarinata Hall (H) 



R-C 

 Leptaena rhomboidalis {Wilck.) 



(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 Cartel. (O) r-c 

 Stenochisma formosa Hall (H) r 

 Strophonella ? conradi Hall (H) r 

 Uncinulus vellicatus 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 jersey ense Weller ?-c 

 Platyceras platystoma Hall (H) r 

 P. ventricosum Con. (H and O) R 

 Tentaculites acula 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 Helderbergian and 7 are Oriskanian species. Omitting from 



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



Helderbergian and 5 Oriskanian species, which vary in number 

 I _— — — — — 



^R^^ery rare; r=rare; c=common; C=very 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. 



