In geology, ripple marks are sedimentary structures (i.e. bedforms of the lower flow regime) and indicate agitation by water (current or waves) or wind.
Read more about Ripple Marks: Defining Ripple Cross-laminae and Asymmetric Ripples, Wave-formed Ripple Marks, Definitions, See Also, References
Famous quotes containing the words ripple and/or marks:
“The pure serene of memory in one man,—
A ripple widening from a single stone
Winding around the waters of the world.”
—Theodore Roethke (1908–1963)
“It has come to be practically a sort of rule in literature, that a man, having once shown himself capable of original writing, is entitled thenceforth to steal from the writings of others at discretion. Thought is the property of him who can entertain it; and of him who can adequately place it. A certain awkwardness marks the use of borrowed thoughts; but, as soon as we have learned what to do with them, they become our own.”
—Ralph Waldo Emerson (1803–1882)