REPORT OF THE STATE PALEONTOLOGIST I903 181 



HELDERBERGIAN SPECIES 

 Favosites helderbergiae Zaphrentis roemeri 



F. sphaericus Rensselaeria cf. aequiradiata 



MANLIUS SPECIES 

 Whitfieldella ? nucleolata Stropheodonta varistriata 



Beyrichia? 



Notwithstanding the absence of Gypidula galeata I have 

 no hesitancy from the above fauna in placing the Favosites bed in 

 the Coeymans hmestone group. For detailed discussion of this bed 

 see C 2, F 2 and H 2. 



Coeymans (proper) middle and upper 



The Coeymans (proper) is a heavy bedded, dark gray limestone, 

 about 40 feet thick. It is usually very coarsely crystalline, being a 

 typical calcarenite. The lower portion is chert free but in the upper 

 part occur thin chert bands, ^ of an inch to i inch thick. It is 

 characterized throughout its whole thickness by an abundance of 

 specimens of Gypidula galeata. 



The chert free beds contain in abundance U n c i n u 1 u s 

 nucleolatus, U. pyramidatus, Rhynchospira 

 formosa, Spirifer cyclopter.us, Atrypa retic- 

 ularis, Favosites helderbergiae and F. sphaer- 

 icus, while in the chert-bearing beds we meet such typical New 

 Scotland forms occurring vtry abundantly as Meristella 

 laevis, Streptelasma strictum, Leptaena 

 rhomboidalis, Dalmanella subcarinata and 

 Delthyris perlamellosa. Some of the chert bands con- 

 tain vefy many bryozoa ; specially abundant are Orthopora 

 rhombifera, O. regularis, Unitrypa praecursa 

 and Lioclema cellulosum. Lichenalia torta is 

 found abundantly in both the upper and lower parts' of the Coey- 

 mans. The Coeymans or pre-Xew Scotland species found here are 

 Rh}'nchonella semiplicata?, Stropheodonta 

 varistriata and Gypidula galeata. Thus it is seen 

 that the chert-bearing beds form a transition from the Coeymans to 

 the New Scotland. But principally on the ground that no specimen 



