1186 



NEW YORK STATE MUSEUM 



Spirifer vanuxemi, and Stropheodonta v a r i - 

 striata. A few of the gray weathering bands just below 

 and just above the Stromatopora bed contain a gastropod fauna. 

 Bed 17, with a thickness of 7 feet, 6 inches, is a veritable coral 

 reef, consisting almost entirely of species of Stroniatopora, which 

 are found also more sparingly in the underlying bed, 16. The asso- 

 ciation between the gastropod fauna and the coral reef is note- 

 worthy. The uppermost layer of the Manlius, 19, is a heavy 

 bed of fine grained, dove-colored silicious limestone, 6 feet, 4 in- 

 ches thick, and is apparently barren of fossils. It forms the 

 lowest bed of the Delaware avenue quarry. The upper surface 

 of this dove limestone is curiously irregular and its contact with 

 the dark overlying basal member of the Coeymans limestone is 

 very sharp. There appears some evidence that the surface of the 

 Manlius was slightly eroded before the Coeymans was deposited 

 on it. Where exposed to the weather for a short time the black 

 limestone can be readily separated from the dove-colored rock 

 and the contact is then seen to be of very undulating nature, as 

 if the soft calcareous mud of the Manlius had been eroded by 

 the currents of the transgressing Coeymans sea when the latter 

 advanced on the sinking mud flats or lagoons of the Manlius 

 continental shelf. 



FAUNA OF THE MANLIUS LIMESTONES 



a=abundant aa=-very abundant ^common r=rare rr=very rare 



Gastropod layer just below the Stromatopora bed. 



Loxonema fitchi Hall, c 

 Holopea pervetusta (Conrad), c 

 H. subconica Hall, c 

 Loxonema sp. ? 

 Murchisonia minuta Hall 

 Hormotoma, small species 

 Modiolopsis dubia Hall 



Gastropod layer just above the Stromatopora bed. 



Holopea elongata Hall 

 Laevidentalium sp.? 

 Spirifer vanuxemi Hall, r 

 Leperditia alta Conrad, c 

 Holopea antiqua (Vanuxem) 

 Zaphrentis sp.? 



Spirifer vanuxemi Hall, c 

 Tentaculites gyracanthus (Eaton), c 

 Stropheodonta varistriata Conrad, c 

 Leperditia alta Conrad, c 



Ostracods, numerous specimens of two 



or three small species 

 Hormotoma, small species 

 Holopea elongata Hall 



