noun
or current mark
: an asymmetrical ripple mark formed by currents of water on the surface of sediments (as river bars, tidal flats, beaches, or sand dunes) — compare oscillation ripple
noun
or current mark
: an asymmetrical ripple mark formed by currents of water on the surface of sediments (as river bars, tidal flats, beaches, or sand dunes) — compare oscillation ripple
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012