l8o NEW YORK STATE MUSEUM 



enii, Stropheodonta varistriata, Tentaculites 

 g y r a c a n t h u s and W h i t f i e 1 d e 1 1 a ? n u c 1 e o 1 a t a ; 

 the latter species is, liowever, confined to the upper 24 feet. Prin- 

 cipally because of the restriction of this fossil to the upper beds, the 

 Manlius has been separated into an upper and lower portion. The 

 lower Manlius is exposed in the lower portions of sections E and F; 

 it contains no fossils that are not likewise found in the upper Man- 

 lius. The upper Manlius is characterized by the first appearance of 

 such Helderbergian species as Favosites helderbergiae 

 and F. s p h a e r i c u s . 



Favosites bed^ (Lower Coeymans, transitional) 



The lithic character of the lower portion of this bed is similar to 

 that of the Manlius, being a compact, dark blue limestone. The 

 upper portion, however, is more coarsely crystalline through the 

 presence of many crinoid joints, being a typical calcarenite.^ The 

 lower surface of the Favosites bed is, in places, very wavy and un- 

 even, as though deposited upon an old, water-worn surface. The bed 

 is composed almost entirely of heads of Stromatopora and Favosites. 

 Where weathered, it is specially recognizable by the concentrically 

 wrinkled laminae of the hydrozoon. At times these heads seem to 

 have been deposited upon a yielding sediment which in places appears 

 to be a continuation upwards of the Manlius and extends between 

 and even partially covers these heads. 



The fossils are most abundant by far in the lower third of this 3 

 foot bed. The most characteristic are Strom atopora con- 

 centrica?, Favosites helderbergiae, F. sphae r- 

 i c u s and Zaphrentis roemeri. There are also found 

 such characteristic Manlius forms as Whitfieldella? 

 n u c 1 e o 1 a t a , ostracods (probably Beyrichia) and Stroph- 

 eodonta varistriata ; the last, however, occurs also in 

 the Coeymans proper. With these occur such Helderbergian forms 

 as L i c h e n a 1 i a t o r t a and R e n s s e 1 a e r i a cf. a e q u i - 

 r a d i a t a. No G y ]) i d u 1 a g a 1 e a t a occurs in the Favosites 

 bed but immediately above it is exceedingly abundant. 



^This name was proposed by Barrett, N. Y. Lye. Nat. Hist. v. 11. 

 'Grabau. Geol. Soc. Am. Bui. I4:349- 



