1010 NEW YORK STATE MUSEUM 



Thickness 

 in feet 



1 Passage shales 3 



2 Middlesex black shale 32 



3 Cashaqua shale 165 



4 Rhinestreet black shale 53 



5 Hatch shale , 203 



6 Grimes sandstone 25 



7 Gardeau shales and flags 372 



8 Portage sandstones 187 



9 Wiscoy shale . 167 



Total 1207 



The following stations are localities where exposures of, 

 these rocks are favorable for study. 



1 Mouth of the gorge at Mount Morris. Formations exposed: 



the Styliola limestone, Upper Genesee shales, the transi- 

 tion bed and the Middlesex shales of the Portage group. 



2 iy 2 miles south of the mouth of the gorge. The Middlesex 



shale and the base of the Cashaqua shale. 



3 Lower part of the Buck run ravine, y 2 mile east of Mount 



Morris. The Cashaqua shale. 



4 Upper part of the Buck run ravine. The Rhinestreet and 



the Hatch shales. 



5 North end of Smoky hollow, opposite the mouth of the 



Silver lake outlet. The Cashaqua, the Rhinestreet 

 shales, and the Hatch shales and flags. 



6 Cliffs opposite the " Five Corners road " 1 mile north of 



St Helena. The Hatch flags. 



7 East end of bridge at St Helena, The Hatch flags and 



the Grimes sandstone. 



8 Cliffs and ravine at the mouth of Wolf creek. The Grimes 



sandstones, Gardeau shales and flags. 



9 Top of Lower falls. The Gardeau flags and shales. 



10 Top of Middle falls. The Gardeau flags and shales. 



11 Foot of Upper falls. The Gardeau beds. 



12 Sides of the gorge above the Upper falls. The Portage 



sandstones. 



13 Long Beards riffs, 1 mile south of Fillmore. Lowest sand- 



stones with Chemung fossils. 



