Silurian Era
current to 425 million years ago

present ground surface in Niagara Frontier

415
million years ago


Lockport Group

(limestone) Oak Orchard intake towers - Robert Moses
Goat Island, 3 Sisters Island
(limestone) Guelph lip of American Falls
(limestone) Eramosa
(limestone) Goat Island resistant caprock at Horseshoe Falls
(dolomite) Gasport

420
million years ago


Clinton Group
(dolomite) Decew cave at Devils Hole
(shale) Rochester tunnels at Sir Adam Beck
(limestone) Irondequoit
(dolomite) Reynales base of Falls/river level
(shale) Neagha
(sandstone) Thorold

425
million years ago


Cataract/Medina Group
(sandstone/shale) Grimsby
(sandstone/shale) Power Glen
(sandstone) Whirlpool Whirlpool level

Ordovician Era

430
million years ago


Queenston Group
(sandstone)

Lake Ontario level

 

 

 

 NIAGARA FALLS THUNDER ALLEY NAVIGATOR


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