44 



NEW YORK STATE MUSEUM 



C. laqueata Rominger 



C. labiosa Billings 



Cyathophyllum cornicnhmi Edwards 



& Haime 

 C. juvenis Rominger 

 (J. robusturu Hall 

 C. validum Hall 



Cylindrophylluin elongatuin Simpson 

 Cystipbyllum scalatum Hall 

 C. sulcatum Billings 

 Eridopbyllmn simcoense Billings 

 Favosites canadensis Billings 

 F. emmonsi Rominger 

 F. epidermatus Rominger 

 F. hemispbaericus Troost 



F. tuberosus Rominger 

 Heliophylhim annulatum Hall 

 TEL. cancellatum Hall 

 H. exiguum Billings 

 Micbelinia cylindrica Edwards d 

 Haime 



Pleurodictyum convexum d'Orbigny 

 Ptycbopbyllum striatum Hall 

 Syringopora nobilis Billings 

 S. perelegans Billings 

 Zaphrentis complanata Hall 

 Z. fastigata Hall 

 Z. gigantea Edwards & Haime 

 Z. tabulata Hall 



Marcellus shale 



With the close of the limestone epoch there was ,'an abrupt 

 change in the sedimentation, and here begins a new series of 

 sediments and very distinct aggregate of faunas. The Marcellus 

 shale introduces black, carbonaceous and pyritous sedimentation, 

 evincing a deepening of the waters and a foul bottom, over which 

 but few forms of life prevailed and these depauperated in size 

 and of very tenuous shell. All the species here found are the 

 apparent proper accompaniments of such bionomic conditions; 

 Liorhynchus limit aris, which puts in an appearance 

 during this stage of the Devonic wherever the sediments become 

 highly cbarged with bituminous matter ; Chonetes mucro- 

 n a t u s, C. 1 e p i d u s, S t r o p h a 1 o s i a t r u n c a t a, P 1 e u- 

 rotomaria r u g u 1 a t a , S t y 1 i o 1 i n a f i s s u r e 1 1 a and 

 Orthoceras sub u latum also follow these conditions. 

 Occasionally members of the congeries have apparently dropped 

 into the deposits from the higher and more prolific zone of life. 



The exposures at Padelford and along Mud creek have fur- 

 nished the following: 



Orthoceras subulatum Hall c C. mucronatus Hall r 



btyliolina fissurella Hall cc Stropbalosia truncata Hall cc 



Fleurotomaria rugulata Hall. .... .c Liorhynchus limitaris Vanuxem.. .cc 



Nuculites oblongatus Conrad c L. multicosta //(/// r 



Chonotcs lepidus Hall c 



