20 NEW YORK STATE MUSEUM 



side, and in a Delaware, Lackawanna & Western Railroad cut, at 

 the west line of the Wayland quadrangle. 



The fauna of the Rhinestreet shale is very limited. The follow- 

 ing list shows the species that have been identified from it : 



Polygnathus dubius Hinde 



Prioniodus spicatus Hinde 



P. erraticus Hinde 



Palaeoniscus devonicus Clarke 



Acanthodes pristis Clarke 



Spathiocaris emersoni Clarke 



Lunulicardium velatum Clarke 



Pterochaenia fragilis {Hall) 



Leptodomus multiplex Clarke 



Lingula cf. ligea 



Plant remains are common, sometimes occurring in masses. 



HATCH SHALE AND FLAGS 



Next above the Rhinestreet shale there is a partial return to 

 the conditions in the Cashaqua beds below, though the light shales 

 are harder and less calcareous, and flags and thin sandstones are 

 more frequent. A few bands of black shale are interbedded, but 

 on the whole the principal lithologic difference between this forma- 

 tion and Cashaqua shale is in the proportion of sandy sediment, 

 which is considerably larger in these beds and increases upward 

 to the top, where they are succeeded by the Grimes sandstones. 



About 200 feet of strata are embraced within this formation, 

 which was named from its abundant exposure on Hatch hill at 

 Naples, Ontario county. There are many small exposures of 

 these rocks in fields and ravines and along the highways, but 

 only a few are sufficiently extensive to afford opportunity for 

 satisfactory examination of them. The best are along the road- 

 side and in a small ravine two miles southwest of Honeoye ; in 

 some small gullies on the west side of Canadice lake ; along the 

 roadside two miles north of Cemetery hill ; in the north ravine 

 near the head of Conesus lake, and the Calabogue ravine at Cone 

 sus, where the entire formation may be seen under favorable con- 

 ditions. In the Canaseraga creek valley the lower part of all the 

 ravines on the east side between West Sparta and Dansville show 

 Hatch shales and flags. They also appear on the west side north- 

 ward from Cumminsville. 



