Early .28low.29 Stage Early Lake Erie

early or low level stage of lake erie. herdendorf, 2013. gray deep water basin, blue lake erie.

about 10,400 ybp ice sheet advancement southward, blocking kirkfield outlet. once again, lake erie basin received water lake algonquin, through port huron outlet , new st. clair river-lake st. clair-detroit river system. additional water created marshy swamp in western basin, created river system through pelee passage. shallow central basin overflowed norfolk moraine creating pennsylvania channel eastern basin. deeper eastern basin overflowed niagara escarpment niagara river brief time. there still division of ideas whether lake erie overflowed niagara river @ time or remained without overflow.

second low stage

by 10,300 ybp north bay outlet opened between lake algonquin , st. lawrence river. level of lake algonquin dropped, ending outflow through port huron outlet. several thousand years lake erie did not receive water upper basins. low water stage lasted 5,000 years. lake lost on 90 percent of inflow, becoming stagnant. lake became eutrophic, acerbated lower precipitation , increased evaporation. closed or endorheic lake basin created bathymetric data compiled national geographic data center in 1998 located former shoreline submerged below lake erie. buffalo ridge shoreline in eastern basin 10 12 metres (33 39 ft) below current river outlet.

the central basin separate eastern basin, isostatic rebound in eastern end, water topped norfolk moraine, creating 1 lake deep channel called pennsylvania channel. alternative may have been significant inflow of water south shore tributaries, raising water level, while deepening pennsylvania channel, until single lake created.