Geology . ?^^ £ u £%•a* a B O V, t- £ . W OH03-~ - c ° go & a7_2 a> 4 o3 G= fl 3 O ° 5 «> s ,2 c3 P S > f- GO c § i S o a 05 fcH «- • r3O 2 a ^_ **> be a> c3• J2 C « R ^ I d 4J . o3 o3 r- -*^> W d THE PLEISTOCENE OR GLACIAL PERIOD. 401. Fig. 520.—Lake Erie and Lake Iroquois; a stage in the history of the eastern GreatLakes, after the ice had retreated so as to open the Mohawk outlet. (Gilbert,U. S. Geol. Surv.)

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Keywords: ., bookcentury1900, bookdecade1900, bookpublishe, booksubjectgeology