143 NEW YORK STATE MUSEUM 



Lower Marcellus shale 



A 4 iiuhes. This is the lowt»st liiyev of the Marcellus shak'S 

 expostnl in the section. The rock is a gray calcai-eous shale 

 breaking; irreguharly, and characterized by the great abundance 

 of ostracodes, certain layers being thickly covered with them. 

 Stylioliua fissurella occurs frequently among the 

 ostracodes, but other fossils are comparatively rare. The follow- 

 ing species were found in this bed: 



Chonetes mucronatus Hall r^ 



Strophalosia truncata {Hall) r 



Liorhynchus limitare (Vanuxem) vv 



Ambocoelia praeumbona Hall rr 



Nuculites nyssa Hall c 



Lunulicardium fragile Hall c 



Modiomorpha sulialata (Courad) r 



Styliolina fissurella iHall) c 



Orthoceras subulatum Hall rr 



Isochilina (?) fabacea Jones cc 



Primitiopsis punctulifera {Hall} r 



B 4 inches. This bed is a gray extremely fissile shale slightly 

 darker in color than bed A. Fossils are abundant, Chonetes 

 mucronatus, Strophalosia truncata, and Lun- 

 ulicardium fragile being the most common forms, and 

 all about equally numerous. The complete list is as follows: 



Chonetes mucronatus Hall cc 



Strophalosia truncata {HalT) cc 



Liorhynchus limitare (Vanuxein) rr 



Tropidoleptufi carinatus Conrad rr 



Ambocoelia nana Grabau r 



Nuculites triqueter Conrad r 



Lunulicardium fragile Hall cc 



Modiomorpha subalata (Conrad) rr 



Styliolina fissurella {Hall) cc 



Orthoceras subulatum Hall rr 



Goniatites ? rr 



Isochilina (?) fabacea Jozies rr 



1 c, commoo; oc, verj oommon; r, rare; rr, very rare. 



