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Las ondulitas, rizaduras o ripple-marks (es muy común el uso del término en inglés) son estructuras sedimentarias que se forman por la acción de una corriente de agua o viento sobre un sustrato de arena suelta. Las de mayor tamaño se denominan dunas, especialmente las de origen eólico.
In geology, ripple marks are sedimentary structures (i.e., bedforms of the lower flow regime) and indicate agitation by water ( current or waves) or directly by wind . Defining ripple cross-laminae and asymmetric ripples.
Ripple mark, one of a series of small marine, lake, or riverine topographic features, consisting of repeating wavelike forms with symmetrical slopes, sharp peaks, and rounded troughs. Ripple marks are formed in sandy bottoms by oscillation waves, in which only the wave form advances rapidly, the
9 de nov. de 2017 · Ripple marks are sedimentary structures formed by water or wind currents. Learn how they are symmetrical or asymmetrical, and how to measure their size in centimeters and meters.
Ripples are known by several names: ripple marks, ripple cross-beds, or ripple cross laminations. The ridges or undulations in the bed are created as sediment grains pile up on top of the plane bed. With the exception of dunes, the scale of these beds is typically measured in centimeters.
Ripple marks are the 3D expression of the same phenomenon as cross-bedding: the actual bedform’s shape exposed in lithified form. They can be either symmetrical or asymmetrical. The 3D model below shows a great example of aysmmetric ripple marks, the kind that form in a unidirectional current.
1 de ene. de 2013 · Learn about the definition, types, formation, and applications of ripples, small-scale bedforms produced by fluid shear at the boundary between moving water or air and sediment. Find out how to use ripples and cross-lamination to reconstruct flow direction, strength, and sediment accumulation rate.
