01918nas a2200217   4500008004100000022001400041245009900055210006900154300001400223490000700237520121900244653002101463653002101484653001301505653002101518653002001539653001101559100001801570700001901588856009301607       2013                        eng d  a0033-589400aMiddle Wisconsin glacial advance into the Appalachian Plateau, Sixmile Creek, Tompkins Co., NY0 aMiddle Wisconsin glacial advance into the Appalachian Plateau Si  a522 - 5330 v803 a<p>Areal mapping of the middle Wisconsin varved clay site along Sixmile Creek near Ithaca, New York, has revealed a much more widespread and varied array of sediments than previously thought. Lacustrine clays, some varved, are interbedded with sands and gravels interpreted as sub-aqueous fan deposits, and both are overlain by a deformation till. Nine radiocarbon dates indicate a 34–37 14C ka BP age for the lacustrine sediment, with the deformation till less than a few thousand years younger. Beneath this sequence is a deposit dated at ± 42 14C ka BP. Both strata represent a tundra climate with a mean July temperature of about 10°C. The Sixmile Creek deformation till must correlate with the 35 14C ka BP till along the Genesee River, 125 km to the NW, and defines a Cherrytree stade glacial advance into the Appalachian Plateau, much further south than what has generally been accepted. Such an advance would require drainage from a proglacial lake in the western Ontario basin to flow westward instead of northeastward. The Sixmile strata suggest a colder than accepted middle Wisconsin stage. Recent data indicate that this stage is one of progressive cooling, with large climatic fluctuations.</p>
10aDeformation till10aMiddle Wisconsin10aNew York10aRadiocarbon ages10aSub-aqueous fan10aVarves1 aKarig, D., E.1 aMiller, N., G.  uhttps://www.cambridge.org/core/product/identifier/S0033589400009157/type/journal_article