44 



NEAV YORK STATE MUSEUM 



C. laqueata Rominger 



C. labiosa Billings 



Cyathopliyllum corniculum Edwards 



d Haime 

 C. juvenis Rominger 

 G. robustum Hall 

 C. validum Hall 



Cylindrophyllum elongatum Simpson 

 Cystiphyllum scalatum Hall 

 C. sulcatum Billings 

 Eridophyllum simcoense Billings 

 Favosites canadensis Billings 

 F. emmonsi Rominger 

 F. epidermatus Rominger 

 F. hemisphaericus Troost 



F. tuberosus Rominger 



Heliopbyllum annulatum Hall 



H. cancellatum Hall 



H. exiguum Billings 



Miclielinia cylindrica Edwards d 



Haime 

 Pleurodictyum convexum d'OrMgny 

 Ptychophyllum 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 limitaris, which puts in an appearance 

 during this stage of the Devonic wherever the sediments become 

 highly charged with bituminous matter ; Chonetes mucro- 

 natus, C. lepidus, Strophalosia truncata, Pleu- 

 rotomaria rugulata, Styliolina fissurella and 

 Orthoceras subulatum 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 



btyliolina fissurella Hall cc 



Pleurotomaria rugulata Hall c 



Nuculites oblongatus Conrad c 



Chonetes lepidus Hall c 



C. mucronatus Hall. . . .'. r 



Strophalosia truncata Hall cc 



Liorhynchus limitaris Vanuxem.. .cc 

 L. multicosta Hall r 



