Very open formations colonizing, within the supra-Mediterranean steppe zone of the Causses (34.71), local deposits of dolomitic sands, characterized by Armeria girardii (=juncea), Arenaria aggregata, Helianthemum pilosum, Sedum ochroleucum, Alkanna tinctoria, Alyssum serpyllifolium, Helichrysum stoechas, Silene otites, Aster alpinus, Festuca christianii-bernardii, Corynephorus canescens, Phleum arenarium.