LOWER SILURTC, SHALES OF THE MOHAWK VALLEY 



83 



Diplograptus vespertinus Ruedemann 



In the Graptolites of New York, Memoir 11, page 352, the author 

 has distinguished a form as mut, vespertinus of Diplo- 

 graptus foliaceus Murchison, occurring typically in the 



Fig. 22 



Fig. 21 



Fig. 23 



^ 



Fig. 21, 22. Diplograptus (Amplexograptus) macer nov. 



Fig. 21. Reverse aspect. Fig. 22. Obverse aspect. Both x 5. 

 Canajoharie shale, Minaville, N. Y. 



Fig. 23. Diplograp.tus peosta Hall. 

 Specimen from Indian Ladder beds at the Indian Ladder, N. Y. x 5. 



" Utica shale " of the Mohawk valley and Hudson valley, and the 

 Lorraine beds. More recent work in these shales has shown that 



