The Loess Bluffs East of Mississippi's Delta

"The loess soil of the region (loess, pronounced ‘lurse’), had been perfect for tunneling.  Loess is able to hold its form almost indefinitely if cut vertically at right angles.  Even natural erosion will diminish once the soil erodes into right-angled bluffs.  This characteristic of loess is responsible for the steep banks of the Old Natchez Trace." - Delta View

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