FAUNA I, SICC'KSSION IN NKW .IKKSKV rKKNION 



I.V.I 



the formation of any yet noticed in New .Jersey, anil contains, in part, 

 the following s})ecies : 



1. Ilindid jxtrra ({j\.). 25. 



2. Slirptelasnia profun(ht {\l.). 26. 



3. Orbicnloidea lamellosa {H.). 27. 



4. Scliizorrinilo Jilom (H.). 28. 



5. Dal))ui)U'lla testndiuaria {D'c\\.) viir. 2*,), 



6. PledambonUes sericeits {^ow.). 30. 



7. Dinorthis pect'uiella (Emm.). 31. 



8. Strophonieiia inciirrata (Shep.). 32. 



9. Ra fim'Sfjiihia allemaia {Emin.). 33. 



10. EJnjtichonella iniipquivalvis (Castel.). 34. 



11. Rhynchotrema deiitala (H.). 35. 



12. Zifgospira recurvirostris {H.). 36. 



13. Cuneamya (runcatula (Ul.). 37. 



14. Whilella rentricosa {U.). 38. 



15. Ctenodonta }iasu(a (H.). 39. 



16. Ctenodonta nitlda (Ul.) ? 40. 



17. Ctenodonta levata {H.). 41. 



18. CUdophorus neglectus {H.). 42. 



19. AUodesnia subellipliciim {V\.)? 43. 



20. Modiolopsis faba (Oon.). 44. 



21. Bucania punctifrons Ewiw^. 45. 



22. Tetranota bidorsata {H.). 46. 



23. Protowarthia cancellala {H..). 47. 



24. Conradella compressiis (Con.) ? 



Arcliitiaccl/a p<(t(/lif(>rniis (H.). 

 Lios])ira sidttilistiiata (H.) 

 Eccyliomphalus trentoncnsis (H.). 

 EccylionipJudiis contignns Ul. ? 

 Holopea oblUpta H. ? 

 Holopea supraplana U. and S. ? 

 Holopea synunetrica H. 

 LopliOi^pira obl'upia Ul. 

 Ilornwtoina gracilis (H.). 

 Pterotheca expansa (Emm. ) ? 

 Comdaria trentonensis H. 

 Harpina ottawensis (Bill.). 

 Trinucleus concentricus (Eaton). 

 Bronteus Innatus Bill. 

 Dalmanella acliales Bill. 

 Pterygometopus calUcephalus (H.). 

 Pratus sp. cf. P. pardusctdus H. 

 Bumastus treiUonensis (Emm.). 

 Calymmene senaria Con. 

 Isotelus gigas De Kay. 

 Ceraurus pleurexanthemua Green. 

 Platymetopus trentonensis (H.). 

 Odontopleura parvula (Wale), 



This fauna is apparently a well defined, typical Trenton fauna, and 

 probably should be referred to about the middle Trenton. 



CORRELATION WITH NEW YORK TRENTON 



From the paleontologic evidence at hand, it can be quite definitely 

 stated that the Trenton limestone in New Jersey represents the lower 

 portion of the Trenton limestone of New York, including the Black River 

 limestone, which is in realit}'' nothing more than the basal portion of the 

 Trenton. It is probable, also, that it does not represent the entire Tren- 

 ton limestone as that formation occurs in its typical area in New York, 

 but that the conditions for the deposition of the overlying shales and 

 sandstone, which we call the Hudson River formation, were initiated 

 earlier in this region than in the t3^pical Trenton area. 



PREVIOUS VIEWS 



The Trenton age of the upper i)ortion of the great limestone formation 

 was recognized by Cook * and termed by him the fossiliferous limestone. 



* Cook, loc. cit., p. 1.31. 



