GEOLOGY OF THE HONEOYE-WAYLAND QUADRANGLES 23 



The formation is nearly 200 feet thick in the Genesee river sec- 

 tion, but thins out toward the west and barely reaches Lake Erie. 

 It is less homogeneous toward the east, some parts becoming shaly, 

 but it is traceable to the Seneca lake valley. 



On the Genesee river and farther west fossils, except plant re- 

 mains, are extremely rare, but on the .Wayland quadrangle and 

 eastward, there are found lenticular masses of crinoidal limestone 

 that contain brachiopods and other fossils in large numbers. 



Except in the southern part of the Wayland quadrangle, the 

 position of these sandstones is too high to permit of good ex- 

 posures, but they are well displayed for nearly a mile along the 

 Pittsburg, Shawmut & Northern Railroad two miles southeast of 

 Perkinsville. Extensive quarries on the hill east of Dansville are 

 in these beds, and they have also been quarried on the south face 

 of the hill one and one-half miles north of Perkinsville. Blocks 

 from a fossiliferous lentil at the south end of the hill four miles 

 east of Wayland have been utilized as firestone in that vicinity. 

 Calcareous slabs from this lens, or possibly another one, lie on the 

 north face of the hill one and one-half miles southeast of Wayland. 



The fossils contained in these lentils have not been listed, except 

 in the case of the large one on High point on the Naples quad- 

 rangle three miles east of this quadrangle, from which 32 species 

 have been obtained. For list, see State Museum Bulletin 63. 



WISCOY BEDS 



About 200 feet of light and dark shales and soft sandstones that 

 contain a fauna bearing some resemblance to that of the normal 

 Portage and on that account have been considered as a separate 

 formation, succeed the Nunda sandstone on the Genesee river. 

 Though acquiring an increase of sandy material and appearing 

 mainly as a bed of rather soft olive sandstone, on the Wayland 

 quadrangle this formation is readily distinguished from the harder, 

 lighter colored and usually more fossiliferous sandstones and harder 

 shales of the normal Chemung beds by which it is overlain. 



There is a small exposure of Wiscoy beds by the side of the 

 Pittsburg & Shawmut Railroad where it crosses the south line 

 of the quadrangle, and a more extensive one from two miles south 

 of Patchenville to the south line of the quadrangle. Crinoid stems, 

 small brachiopods and a small Orthoceras occur here. The large 

 cephalopod Manticoceras oxy Clarke appears occasionally 

 in these beds. 



