REPORT OF THE STATE PALEONTOLOGIST 1902 1011 



15 Wiscoy creek ravine, above the bridge at Wiscoy. The 



Wiscoy shales, the Long Beards riffs sandstones and 



Chemung shales and sandstones. 

 20 Wolf creek ravine below Castile. The Portage sandstones 



and the lower part of the Wiscoy shales. 

 42 The ravine of Cashaqua creek from Son Yea to Tuscarora. 



The Cashaqua and Rhinestreet shales. 



Oatka valley section 



That part of the Oatka creek, or Warsaw valley, in which the 

 bed rock belongs to the Portage formations, lies about 10 miles 

 north and west, and 300 to 400 feet higher than the exposures 

 of the same horizons in the Genesee river section, and is about 

 13 miles long. 



The Portage sandstones and the top of the Gardeau flags are 

 exposed at Oatka falls near Rock Glen, but there are no other 

 exposures of Portage strata in the channel of the river. There 

 are many ravines, some of which are very deep, in the sides of 

 the valley, and they afford good exposures, that together, vir- 

 tually cover the entire Portage section. 



The following are some of the most important of the expos- 

 ures, beginning at the north. 



In a small ravine on the west side, about opposite the village 

 of Pearl Creek, the little brook flows over a cascade 15 feet 

 high, of which a compact layer of the Styliola limestone of the 

 Genesee shales forms the crest. 



Above the cascade about 50 feet of bluish upper Genesee 

 shales are exposed, and a few feet of the Middlesex shales of 

 the Portage formation outcrop above them, and rest directly on 

 the Genesee shales. 



The transition bed is not perceptible here. 



In the ravine at Wyoming village about 50 feet of the upper 

 part of the Cashaqua shales are exposed. They are mostly light 

 bluish gray or olive and very soft. Calcareous concretions and 

 concretionary layers are frequent. Fossils are quite common. 



Farther up the ravine and about y± mile from the village, 40 

 feet of black shales in the horizon of the Rhinestreet shales are 

 exposed, and above them, about 30 feet of alternate layers of 

 light and dark or black shales. 



