LUDVIGSEN, Rolf. The Burgess Shale: Not in the Shadow of the Cathedral Escarpment. Geoscience Canada, [S. l.], v. 16, n. 2, 1989. Disponível em: https://journals.lib.unb.ca/index.php/GC/article/view/3594. Acesso em: 28 mar. 2024.