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illinoian

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  • moraines from Wisconsinan and Illinoian glaciations Other Glacial Effects
  • by previous Illinoian glaciation 128 000 yrs ago Ecosystem overview Northern Oak Relationships Soil Profile
  • well be old but if so it s stagnant and barely moving Water does not flow from Georgian Bay to Lake Ontario through groundwater There is a flow divide both in the overburden and the bedrock Millions of years seems to be a bit of a stretch though I d be surprised if it dates to before the Illinoian stage which only ended 130 000 years ago Do you have a reference for
  • A Prehistory of Toronto Geological Ages 4 PLEISTOCENE AGE STRATIGRAPHY OF THE ILLINOIAN GLACIATION
  • time Data are from western Kansas and the sections are particularly generalized from south central Gove County Wisconsinan and Recent dissection by minor tributaries is ignored The gradient of the surface of the Kansan Illinoian terrace of the Smoky Hill converges with and diverges from the gradient of the late Wisconsinan terrace and the flood plain in response
  • first glance the area where the branches meet appears normal however a closer look reveals patterns arising from a series of events that changed the flow dynamics of the entire river system Apple River Canyon State Park is nestled on the east side of the Driftless Area An ice sheet advanced to approximately 3 miles from this site during the Illinoian glacial stage ~250
  • at four distinct stages preglacial Figure 7 maximum extent of the Illinoian or Iowan ice advance Figure 8 early Wisconsin ice advance Figure 9 and postglacial Figure 10 Figure 7 Preglacial drainage pattern in northern Montana From Alden 1932
  • locally grades upward into Loveland silt member in southeastern Kansas predominantly chert gravels Illinoian in age Commonly 50 feet thick Figure 5 Pleistocene rocks in Kansas Yarmouthian and Kansan Stages Deposition during Kansan time was largely influenced by Kansan glaciation This ice sheet extended more than 100 miles into the State and glacial till
  • Figure 7 Preglacial drainage pattern in northern Montana From Alden 1932 Figure 8 Drainage pattern in northern Montana at height of Illinoian or Iowan glacial advance Preglacial drainage pattern indicated in dashed lines From Alden 1932
  • in the western U S The point is that on the fine scale of time glacial advances did not happen at the same time in different climatic zones even in the northwestern U S The marine oxygen isotope stages 2 4 and possibly stage 5d represent the Wisconsin glaciation or Pinedale while stage 6 represents the Illinoian glaciation or Bull Lake

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