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NEW YORK STATE MUSEUM 



which were originally described from the upper Devonic beds 

 of Iowa, and attention is here directed to a more complete state- 

 ment of the fossil contents of these beds in a subsequent para- 

 graph. The rock is not exposed on the south or west sides of 

 the depressions that isolate High point, though calcareous layers 

 of somewhat similar character occur at about the same horizon 

 in the cliff on the northwest end of Knapp hill and also in the 

 escarpment near Mr J. Eldridge's residence on the road from 

 Garlinghouse to Atlanta. Hard, dark shales and thin sandstones | 

 come in again at the top of the High point bluff and are slightly 

 exposed in the fields above but no fossils were observed in them 

 and nothing but their position distinguishes them from those 

 below. On the south side of the Naples valley the Highpoint 

 beds appear in some isolated outcrops on the north slope of Pine 

 hill and in the bluff on the west side of Knapp hill and the thick 

 sandstones that form the escarpments above the talus in the 

 vicinity of McClarie's quarry on the dugway road just east of 

 North Cohocton are in the same horizon, but the rock here is 

 almost barren of fossils. They are also to be seen in Lyons hol- 

 low by the side of the road leading east, 2 miles south of Ingleside; 

 in the upper part of Italy gully and on the tops of Worden and 

 Gannett hills. Careful stratigraphic work has determined that 

 the Highpoint sandstone is continuous with the original Portage 

 sandstones of the Genesee valley, which in Professor Hall's sec- 

 tion capped the Portage section there. It has also been pointed 

 out that while these horizons are stratigraphically continuous 

 the fauna is very different in the two sections. The Portage 

 sandstones still carry the Naples fauna, while in the Naples region 

 that fauna has long before this date been extinguished by the 

 appearance, first of the Ithaca, then of the Chemung fauna from 



the east. 



Prattsburg sandstone and shale 



In the lower part of this division the sandstones are mostly 

 olive-gray, rather soft and schistose or in thin even layers, and 

 the shales are in part soft and blocky, similar in appearance to 

 the Cashaqua shales. Layers of blue, olive and black shales occur. 



