Twidale, Charles Rowland, and Juan Ramón Vidal Romaní. “Are Corestones Due to Weathering and/Or Tectonism? Problems and Suggestions”. Cadernos do Laboratorio Xeolóxico de Laxe. Revista de Xeoloxía Galega e do Hercínico Peninsular 420 (December 28, 2020): 29-52. Accessed October 22, 2021. https://revistas.udc.es/index.php/CADLAXE/article/view/cadlaxe.2020.42.0.7268.