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Cross-section of a dune near Ostend, Belgium showing Eolian cross-bedding.

Dune with Eolian Cross-bedding

Cross-section of a dune near Ostend, Belgium showing Eolian cross-bedding.

Cross-section of a dune near Ostend, Belgium showing Eolian cross-bedding.

Dune with Eolian Cross-bedding

Cross-section of a dune near Ostend, Belgium showing Eolian cross-bedding.

A type of ripple mark in the Lop-Nor Desert in Turkestan.

Ripple Mark in Lop-Nor Desert, Turkestan

A type of ripple mark in the Lop-Nor Desert in Turkestan.

A type of ripple mark in the Lop-Nor Desert in Turkestan.

Ripple Mark in Lop-Nor Desert, Turkestan

A type of ripple mark in the Lop-Nor Desert in Turkestan.

A type of ripple mark in the Lop-Nor Desert in Turkestan.

Ripple Mark in Lop-Nor Desert, Turkestan

A type of ripple mark in the Lop-Nor Desert in Turkestan.

A type of ripple mark in the Lop-Nor Desert in Turkestan.

Ripple Mark in Lop-Nor Desert, Turkestan

A type of ripple mark in the Lop-Nor Desert in Turkestan.

Cross-bedding in Sylvania sandstone.

Sandstone with Cross-bedding

Cross-bedding in Sylvania sandstone.

"Enlarged sectional view of a ripple or train of waves." —Croft 1917

Wave

"Enlarged sectional view of a ripple or train of waves." —Croft 1917