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Lake Arkona was a stage of the lake waters in the Huron-Erie-Ontario basin following the end of the Lake Maumee levels and before the Lake Whittlesey stages, named for Arkona, Ontario, about east of Sarnia.〔Spencer, J. W., High-level shores in the region of the Great Lakes and their deformation: Am. Jour. Sei., 3d ser., vol. 12, 1891, p. 204〕〔 ==Beaches== The ice sheet had withdrawn north of the "thumb" of Michigan, then advanced southward, raising water levels to the east of the "thumb", but not those to the west.〔 This created four distinct areas around Lake Arkona: # In the Saginaw basin, where the Arkona beaches were neither submerged nor modified; # The area on the "thumb", where the beaches were overridden by the ice and destroyed; # The Black River valley, where the beaches were submerged but protected from modification; and # The area, which would be Lake Whittlesey, where the beaches were submerged and modified by storm waves.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Lake Arkona」の詳細全文を読む スポンサード リンク
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