Photo Duncan Heron 44. Ripples on slip face of dune. Photo Duncan Heron 45. Avalanche sand on wind dune slip face. Photo Duncan Heron 46.
Thick layers are grain flow and thin layers are grain fall.
Rio Grande do Norte, Brazil. Photo Duncan Heron 47. Photo Duncan Heron 48. Thick layers are grain flow and thin layers are grain fall. Permian Schnebly Hill Fm.