The Mississippi River takes a sharp turn south when it runs up against the loess bluffs here. The top of the outcrops are the loess deposits.
Description
Loess
Loess (/ˈloʊ.əs/, /ˈlʌs/, /ˈlɛs/, or UK/ˈlɜrs/) is a clastic, predominantly silt-sized sediment, which is formed by the accumulation of wind-blown dust.