12 NEW YORK STATE MUSEUM 



shale is quite barren of fossils, but in the Naples valley it carries 

 masses of terrestrial plant remains, annelid teeth and rarely L i n - 

 g u 1 a 1 i g- e a ; fish remains have been found in it in some abun- 

 dance at Sparta, Livingston co. and near Mt Morris. The lighter 

 colored layers in Erie county contain a few of the more common 

 species of the Naples fauna. 



Hatch shale and flags 



Of this formation, which attains a thickness of 440 feet, the lower 

 part is very much like the Cashaqua beds in the character of the 

 sedimentation, consisting principally of soft blue or olive argillaceous- 

 shale and thin sandstones that are frequently laminated or schistose. 

 There are occasionally thin seams of dark or black shale and some 

 layers of sandstone are calcareous and concretionary, while most are 

 silicious, light blue gray and hard. These flags are usually smooth 

 on the lower surface while the upper is shaly or with wavy lamina- 

 tions, a condition characteristic of nearly all the thin sandstones in 

 the Hatch division farther west. The changes from light to dark 

 and from hard to soft are generally more pronounced in the upper 

 part and in many natural outcrops. The frequent flags projecting 

 beyond the soft sidles produce a coarsely straticulate appearance. 

 In the Naples valley the Hatch shales are 312 feet thick. The lower 

 part contains a few fossils common in the Naples fauna but the 

 upper part is almost barren except for obscure plant remains. No 

 brachiopods have been found in them, in that vicinity or farther west. 



The lower beds of this formation are exposed in Havana glen 

 from the Curtain cascade upward ; in the Montour Falls ravine 

 above the bridge ; in Watkins glen above 650 feet A. T. ; in the Big 

 Stream and Rock Stream ravines west of the Northern Central Rail- 

 road ; in Glen Eldredge and the Hector falls ravine above the lowest 

 highway bridge. The upper portion of the rocks is seen at Odessa 

 and along the Lehigh Valley Railroad to the north. 



West of this (Quadrangle the formation is exposed in the Glen 

 brook at Hammondsport and along the dugway road on the east side 

 of the head of Keuka lake ; at Naples at the foot of Hatch hill and 

 in the lower part of the Grimes and Tannery gullies ; in the cliffs 



