INDEX TO PLATES IN GEOLOGIC OKDEE 



259 



PLATE 



LV. 



LVI. 



LVII. 



LVIII. 



LIX. 



LX. 



LXI. 



LXII. 



LXIII. 



LXIV. 



LXV. 



LXVI. 



LXVII. 



LXYIII. 



LXLX. 



LXX. 



CX. 



CXV. 



CXVI. 



CXVIL 

 CXVIII. 



cxvm. 



CXIX. 



FACING PAGE 



Niagara Gorge below the Suspension Bridge, Niagara county. 



View from the Canadian side ... 154 



Niagara Groups, Medina, Clinton and ; Niagara Eiver Gorge 



from the Suspension Bridge, looking north 154 



Outlet of the Whirlpool, Niagara River, Niagara county. 



View northward from the Canadiau shore 154 



Niagara Group, Upper Falls of the Genesee Eiver, Eochester, 



Monroe county 154 



Niagara Group, Gorge of the Genesee Eiver helow the Upper 



Falls, Eochester, Monroe county 154 



Niagara Eiver, Niagara county. View from bluff near Lewis- 

 ton, looking north 154 



Upper Silurian Eocks in road cut near Howe's Cave, Scho- 

 harie county 154 



Clinton and Salina Groups in West Bank of Eondout Creek, 



High Falls, Ulster county ~ 154 



Clinton Beds at High Falls, Ulster county, Arch in Salina and 154 

 Quarry of the Cummings Cement Co., Akron, Erie county. .. 156 

 Waterlime Group, Old Mine of the Newark Cement Co., 



Eondout, Ulster county - 156 



Waterlime Group, Ulster county; High Falls of Eondout 



Creek, over Cement Beds of the 156 



Helderberg Escarpment, West Mountain, Schoharie, from a 



photograph by N. H. Darton 158 



Lower Helderberg Limestone, Sink in the; west of Cox- 



sackie, Greene county 158 



Lower Helderberg Limestone, interior of Howe's Cave, 

 Schoharie county, showing Subterranean Stream, Stalac- 

 tites, etc 158 



Lower Pentamerus Limestone. Cliff of; near Indian Ladder, 



Albany county 158 



Lower Helderberg Limestone, Quarry in the ; South Bethle- 

 hem, Albany county 206 



Waterlime Group, Interior View of Cement Mine at Eosen- 



dale, Ulster county 222 



Waterlime Group, Cement Quarries, one mile south of White- 

 port, Ulster county 222 



Buffalo Cement Co., Buffalo, Erie county, Quarry of the 222 



Lower Pentamerus and Tentaculite Limestone, Quarry in; 



Howe's Cave, Schoharie county 222 



Tentaculite Limestone, Quarry in Lower Pentamerus and; 



Howe's Cave, Schoharie county 222 



Quarries of the Buffalo Cement Co., Buffalo, Erie county 222 



