. Glacial formations and drainage features of the Erie and Ohio basins. whole of the Great Lakes area, and Upham and Lawson have supposed it to coverall but Lake Ontario. The whole series of beaches has been regarded as the work ofone lake at as many halts in the fall of its level. This is true in a wide sense, butthere were so many elements of change as the waters fell that it seems appropriateand necessary to consider the several stages as separate lakes and give a special nameto each. The waters changed their shape, size, and level as they fell, and, what seemsstill more important, they cha
. Glacial formations and drainage features of the Erie and Ohio basins. whole of the Great Lakes area, and Upham and Lawson have supposed it to coverall but Lake Ontario. The whole series of beaches has been regarded as the work ofone lake at as many halts in the fall of its level. This is true in a wide sense, butthere were so many elements of change as the waters fell that it seems appropriateand necessary to consider the several stages as separate lakes and give a special nameto each. The waters changed their shape, size, and level as they fell, and, what seemsstill more important, they changed the place of their outlet several times. The need for the restricted use of the name Lake Warren here proposed is anatural result of the progress of discoverJ^ With the finding of outlets and terminalmoraines intimately related to the beaches, the moraines marking the place of theice barrier that held the waters up, it becomes a positive necessity to recognize the 1 Bull. Geol. Soc. America. Vol. VIII, 1897, pp. 56-57. us. GEOLOGICAL SURVEY MONOGRAPH XLI BEACHES OF LAKE WARREN. 759 new facts, and this can be done best, as it seems to the writer, by subdivision andrestriction in nomenclature, as is sometimes done in the biological sciences. Thewhole series of lakes here described might be called the Warren lakes. This wouldbe one waj of preserving Spencers nomenclature, but in the writers opinion thisuse of the name would be unfortunate. A collective name ought to have some geo-graphic significance. The name Erie-Huron, which is used here, serves this purposeadmirably, and the name Lake AVarren may then be applied in a more restrictedway to that one of the several separate lakes of the series which most closely corre-sponds to Spencers original idea. The Forest beach marks the widest extent of theErie-Huron glacial waters, and was the last and most extensive lake of the seems more appropriate, therefore, to call this stage Lake Warren than to applythis na
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