Deposits of Sand: Ripples Versus Dunes - Dune Worlds: How Windblown Sand Shapes Planetary Landscapes - page 62

Fig. 5.16 Concentration of cm-sized pumice clasts on the surface of
a megaripple, Purulla, Argentina. The interior of the megaripple
consists almost exclusively of medium sand derived from several

ignimbrites exposed in the area; here particles from on the crest
consistently fell onto the exposed trough dug across the ripple crest.
Scale is in cm. Photo J. Zimbelman

Fig. 5.18 Plot demonstrating three distinct scales of aeolian features
showing data from Wilson (1972a). Points represent measurements of
features from around the world—the three sets of points are quite
distinct. Vertical axis is the grain size of the 20th percentile of particles
from the feature

Fig. 5.17 Scaled profiles of different types of ripple (after Fig. 6 of
Zimbelman et al. 2012)