The Geology of Dunedin, (New Zealand)

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Abstract
I. Introduction, and Description of the Topography of the Area. The eastern coast of the South Island of New Zealand has two projecting points consisting of volcanic rocks of Kainozoic age. These igneous masses constitute Banks Peninsula and the Otago Peninsula. Except in regard to their physiographical nature, neither of these areas has been submitted to accurate geological examination, although enough work has been done to show that both of them offer a most interesting field for petrographical study. The general structure of Banks Peninsula was studied by Sir Julius von Haast, who traced and described various crater-walls which were the boundaries of the foci of most intense volcanic activity. The structure of one of these—Lyttelton Harbour—was displayed with great clearness in the walls of the railway-tunnel that pierced it, and Sir Julius has given an accurate description of this. Many of the rock-specimens collected during the tunnel-driving were described and figured by the officers of the French Campbell-Island Expedition. Other rock-specimens from the district have been described by Marshall, Speight, and Ulrich. So far as its general structure is concerned, Otago Peninsula has received less notice, though brief descriptions have been given by Hutton, Hector, and Ulrich. More detailed work has been devoted to the Otago-Peninsula rocks, and some types were described by Hutton, and later, in a far more elaborate manner, by Ulrich. who was the first to recognize the specially-interesting series of alkaline rocks that occurs here. In the present paper an attempt will be made to

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