where is hornfels formed
Whangarei Heads, Tokatoka (Kaipara area), Paritu (northern Coromandel Peninsula), west Nelson area. Hornfels is a metamorphic rock formed by the contact between mudstone / shale, or other clay-rich rock, and a hot igneous body, and represents a heat-altered equivalent of the original rock.hangarei Heads, Tokatoka (Kaipara area), Paritu (northern Coromandel Peninsula), west Nelson area. Hornfels is a metamorphic rock formed by the contact between mudstone / shale, or other clay-rich rock, and a hot igneous body, and represents a heat-altered equivalent of the original rock.