P. R. Giot, Andre Guilcher; Les formations littorales anciennes du Ri pres de Douarnenez (Finistere) [with discussion]. Bulletin de la Société Géologique de France ; S6-III (9): 809–816. doi: https://doi.org/10.2113/gssgfbull.S6-III.9.809
A study of a littoral formation, a marine sand cemented by limonite, which occurs in the Ri beach region, near Douarnenez, Finistere, France. The ferritization and consolidation seem to have been caused by the action of local springs and influenced by the position of the formation along the shore. The age is probably Normanian (early Quaternary).