NEW YORK STATE MUSEUM 



87 



Nunda, rock exposures at, 60, 62, 



65. 

 Nunda group, 46 ; introduction of 



name, 47. 

 Nunda sandstone, 47, 48, 61-64. 

 Nunda valley, 59, 74. 



Oatka creek valley, 59, 65, 73. 

 Ontario accincta, 54. 



clarkei, 61. 



suborbicularis, 54, 57, 61. 

 Ontario county, 51. 

 Ontario depression, 70. 

 Ontario, Lake, 81. 

 Orbiculoidea sp., 62. 



alleghania, 68. 



lodensis, 50, 52. 



cf. media, 68. 

 Orthoceras sp., 66. 



filosum, 54. 



Ontario, 54. 



pacator, 54, 57, 60. 



Palaeoneilo petila, 54. 

 Palaeotrochus praecursor, 57, 60. 

 Paleoniscus devonicus, 56. 

 Paracardium doris, 54, 61, 66. 

 Parrish limestone, 54. 

 Penn Yan, rock exposures at, 53. 

 Perry, rock exposures near, 58. 

 Phragmostoma natator, 51, 54, 57, 



60. 

 Pike, rock exposures near, 67. 

 Pike creek, 52, 53. 

 Pinnopsis see Lunulicardium. 

 Pleistocene history of the Genesee 



valley in the Portage district, by 



Herman L. Fairchild, 70-84. 

 Pleurotomaria sp., 66. 



rugulata, 50, 52. 

 Polygnathus dubius, 56. 

 Portage canyon, 81. 



I Portage group, 46, 57, 63; first use 

 as a group term, 46; use of term, 

 Portage-Mount Morris district, 73- 

 75- 

 Portage-Nunda lake, 76-77, 81. 



Portage shales and sandstones, 46, 



47- 

 Portageville, rock exposures at, 61, 



62, 65. 

 Portageville Bluestone Co., 61. 

 Portageville morainal lake, 77-78. 

 Posidonia attica, 61. 

 Powell, Maj. John W., mentioned, 



45- 

 Prioniodus erraticus, 56. 



spicatus, 56. 

 Pristacanthus vetustus, 56. 

 Probeloceras lutheri, 50, 54, 57. 

 Productella hirsuta, 68. 



lachrymosa, 68. 



speciosa, 68. 

 Pterochaenia cashaqua, 54. 



fragilis, 50, 51, 52, 54, 61. 



Quarry hill, rock exposures at, 60, 

 62. 



i 



Relyea creek, 62, 65. 



Rhinest'reet black shale, 48, 54, 55- 



56. 

 Rochester district, 72~73, 83. 

 Rock Glen, rock exposures at, 62. 

 St Helena bridge, 56, 57. 

 St Helena creek, 73. 

 St Helena Flats, 56. 

 St Helena-Gibsonville morainal lake, 



79- 

 Scottsville lake, 81. 

 Seneca county, 53. 

 Seneca lake, 53. 

 Silver lake outlet, 57, 58. 

 Smoky Hollow, rock exposures 



near, 54, 58. 

 Sonyea, rock exposures near, 53, 



55, 56. 

 South Warsaw, rock exposures 



near, 59. 

 Spathiocaris emersoni, 56. 

 Spirifer disjunctus, 63, 66, 68. 



mesacostalis, 68. 

 Springwater valley, 57. 

 Standish shale, 52. 

 Steuben county, 65. 



