NAPLES FAUNA IN WESTERN NEW YORK, PART 2 2 13 



Feet 



3 Rhinestreet bituminous shales ._._.. 21 



4 Hatch sands, flagstones and sandstones with intermingled clay- 



shales -■ 312 



Throughout this interval of about 600 feet the Naples fauna prevails, 

 without evidence of encroachment of the eastern or Ithaca fauna. 



5 Grimes sandstone. Thin bedded, gray flags and sands contain- 



ing the Ithaca fauna ._-__.-_ 50 



6 Westhill sandstones ; heavy bedded sands, flags and few 



shales ._.... 600 



Fossils occur in these rocks (6) only occasionally, but they are chiefly 

 indicative of the Ithaca or possibly the earliest stages of the Chemung 

 fauna. 1 We find here such species as the dictyosponges, Hydnoceras 

 tuberosum, H. variabile, Hydriodictya cylix, Ceratio- 

 dictya annulata; the brachiopods, Spirifer mucronatus var. 

 posterus, Sp. mesastrialis, Stropheodonta cayuta, Schiz- 

 ophoria impress a, etc. No trace, however, appears of Spirifer 

 disj unctus except in 



7 Highpoint sandstone. Heavy bedded, more or less calcareous sand- 



stones 

 Genesee river section. At the base are 



, Feet 



i Middlesex black band --------- 35 



2 Cashaqua shales --------- 130 



3 Rhinestreet black band -------- 52 



4 Hatch flags and sandy shales ------- 209 



5 Representing the position of the Grimes sandstone but carrying 



no Ithaca fossils --------- 25 



6 Gardeau ( -Westhill) flags and sandstones with few fossils - 428 



7 Portage sandstones --------- 182 



8 Wiscoy shales, flags and sandy or clay shales - - - - 150 



1 It is extraordinarily difficult to fix on a division plane between the Ithaca and the 

 overlying Chemung faunas, as the one passes into the other by easy gradation, and we 

 are still somewhat at loss in determining specific values indicial of the early stages of 

 Chemung time. 



