verruca no (verokano)

[ the Alps, and in northern Italy, sometimes in ma es of great thickne , which often take on a gnei oid or schis tose structure. In certain localities the verruca no overlies a slaty rock which contains plants of Carboniferous age: hence some geologists have considered it as belong ing to that formation, while others have regarded it as the equivalent of the Rothliegende, the lower division of the Permian.