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    Dating recent peat deposits datingdating info

    The ice sheet produced large quantities of gravel, sand, and silt.A mixture of these materials, called till, forms much of the soil in the Ohio and Upper Mississippi River valleys.Because organic matter accumulates over thousands of years, peat deposits also provide records of past vegetation and climates stored in plant remains like pollen.This allows humans to reconstruct past environments and study changes in human land use. All authors collected data, and commented on the manuscript at all stages. This research was supported by the USGS Mendenhall Postdoctoral and Earth Surface Dynamics Programs.

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    *Prices in US$ apply to orders placed in the Americas only.Those of us who live in the Midwest United States seem to have the worst of both worlds.Hot humid summers, where the temperature often reaches 95 degrees, and cold winters where the mercury can plummet to zero.We developed here an improved procedure involving an ashing step prior to acid extraction.This allows substantial improvements such as: 1/ the use of a relatively small amount of acid compared to the classical procedure and 2/ the substantial reduction of a total sample digestion time.

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