Plate 49 
The Whirlpool rapids and American bank of Niagara gorge, looking north. The rocks 
are nearly horizontal strata of Siluric age consisting of Lockport or Niagara limestone 
(iorming uppermost cliff) followed downward by Rochester shale, Clinton limestone and 
shale (exposed near middle of bank), and Medina sandstone and shale. The gorge is 
here 250 feet deep. From N. Y. State Mus. Bul. 45, pl. 10 
