ripple mark

Despite the tsunami’s width, no one has ever found ripple marks formed by the wave before.

Those dunes look nearly identical to the ripple marks buried beneath Louisiana, except for their size, Kinsland says, supporting the notion that the taller structures were also produced by a tsunami, though one of a much larger magnitude.

The asteroid impact that slew the dinosaurs may have also indirectly sculpted the largest ripple marks ever found on Earth.

What is known as the "ripple-mark" in sandstone surfaces may be produced in various ways.