“…He noted a significant change in colour and texture downstream from Valence where the loess becomes coarser and reddish. In the following decades, many studies revealed thick loess deposits (Tricart, 1952;Mazenot, 1956Mazenot, , 1957Mazenot, , 1965Bourdier, 1961;Bonifay, 1962Bonifay, , 1965Alimen, 1965;Dubar, 1972Dubar, , 1979Dubar, , 1983 as well as sand dunes, ventifacts, and (niveo-)aeolian pans (Gabert, 1965;Gabert-Delay, 1967;Ambert, 1973Ambert, , 1974Ambert, , 2013Chardon, 1975;Clauzon et al, 1990;Ambert and Clauzon, 1992). Polygonal wedge networks caused by ground thermal contraction and filled with windblown sand (sand wedges) were also described (Bouteyre and Allemann, 1964;Gabert-Delay, 1967;Cailleux and Rousset, 1968;Nury and Roux, 1969;Arnal, 1971aArnal, , 1971b.…”