Luminescence dating accuracy Busty dates
Even well managed loess farmland can experience dramatic erosion of well over 2.5 kg /m per year.In China the loess deposits which give the Yellow River its color have been farmed and have produced phenomenal yields for over one thousand years.
the time elapsed since the last exposure of the mineral grains to daylight.
Relative to the pampean loess the neotropical loess is poor in quartz and calcium carbonate.
The source region for this loess is thought by some scientists to be areas of fluvio-glacial depostis the Andean foothills formed by the Patagonian Ice Sheet.
Loess grains are angular with little polishing or rounding and composed of crystals of quartz, feldspar, mica and other minerals. Loess deposits may become very thick; more than a hundred meters in areas of China and tens of meters in parts of the Midwestern United States.
It generally occurs as a blanket deposit that covers areas of hundreds of square kilometers and tens of meters thick.
During the autumn and winter, when melting of the icesheets and icecaps ceased, the flow of meltwater down these rivers either ceased or was greatly reduced.