Petrological examination of rocks from Cuvier Island (N.Z.M.S. 1, Sheet N36) collected by Messrs J. Healy and B. N. Thompson of the Geological Survey has indicated that certain contact rocks are highly tourmalinised (P 12992, 12993, 23185 * Numbers refer to samples in the collections of the Petrology Section, N.Z. Geological Survey, Lower Hutt. View all notes A brief account of this discovery is incorporated in the Geological Map of New Zealand 1 : 250,000, Sheet 2B, Barrier, where it is stated, “The western end of Cuvier Island is composed partly of Moehau Formation siltstone metamorphosed to hornfels by quartz porphyry and plutonic intrusives. Both the hornfels and a large part of the intrusive rocks have been tourmalinised, silicified, and carbonated.” (Thompson, 1960.) The intrusive rocks are noritic quartz gabbros, biotite-augitequartz gabbros and quartz diorites, and can be correlated with similar rocks on Coromandel Peninsula (“Paritu Tonalite”).