Le 23 décembre 2019
Escale sur la route du Nord dans les Baronnies Provençales, à Saint-André-de-Rosans, pour y découvrir une curioisité géologique méconnue : des boules de grès aux allures d'oeufs de dinosaure, de tortues ou toute autre entité de forme ovoïde, et issues d'un phénomène d'érosion différentielle... La colline du Serre d'Austruy offre des centaines de ces boules, incrustées à l'horizontale sur les dalles de grès ou à la verticale sur la falaise est, et d'un diamètre variant de quelques dizaines de centimètres à plus d'un mètre. Une belle couveuse à dinosaures, insolite, et magnifiée ce jour par les nombreux arcs-en-ciel en bordure de la perturbation qui circule plus au nord.
sur la dalle de grès
détail des boules de grès (devant arc-en-ciel)
le lichen sur les crevasses du grès
l'un des oeufs après éclosion
les plus beaux oeufs en contrebas des falaises est
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