SCHIØLER, Poul et al. Lithostratigraphy: Stronsay Group, the Horda Formation. GEUS Bulletin, Copenhagen, Denmark, v. 12, p. 57–63, 2007. DOI: 10.34194/geusb.v12.4936. Disponível em: https://geusbulletin.org/index.php/geusb/article/view/4936. Acesso em: 22 oct. 2025.