Also known as cross-stratification; a primary
sedimentary structure characterized by an arrangement of
strata that are inclined to the main stratification. Cross-stratification
is commonly referred to as cross-bedding, although it
is formally divided into cross-lamination for inclined layers
that are less than 0.4 inch (1 cm) thick, and cross-bedding for
inclined layers that are thicker than 1 centimeter. Cross-beds
are referred to as sets if they are part of a single related
group, and cosets if they are from a different higher or lower
layer in the deposit. Cross-beds and cross-laminations are
produced by the migration of bed forms produced by water
or air currents including current and wave ripples, and sand
dunes. The largest cross-beds are produced by wind-blown
sand dunes.
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