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North Shore Heritage Thematic Review Report ... - Auckland Council

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Theme 1 Land and People<br />

1.1 Geology<br />

Long known as the marine suburb, Devonport is defined by its coastal edges, its volcanic cones and its<br />

ridge and valley topography, which is typical of the <strong>Auckland</strong> isthmus generally. It is a peninsula with its<br />

eastern coastal edge of Narrow Neck and Cheltenham Beach facing Rangitoto and the Hauraki Gulf and its<br />

southern, city-facing, coast extending from <strong>North</strong> Head/Torpedo Bay to Stanley Point. Further round, the<br />

west-facing coastline is deeply indented and tidal with a number of smaller peninsula „fingers‟ extending<br />

into the water at Duder‟s Point and O‟Neill‟s Point/Bayswater Wharf. This portion includes Shoal Bay and<br />

Ngataringa Bay, where the mangrove swamps have been reclaimed in several places since the 1870s.<br />

Before the <strong>Auckland</strong> volcanic eruption 40,000 years ago, Devonport was made up of three islands. The<br />

main one was a large mass of Waitemata papa, 25 million years old, which extended from Vauxhall Road<br />

to Stanley Bay. The small islands were the cliff top of Fort Cautley military camp and the Stanley Bay<br />

block. Shoal Bay at that time formed a stream flowing into the Waitemata and Ngataringa Bay was open to<br />

the gulf.<br />

Fig. 1. Geological features of the Devonport Peninsula, Warren Wilcox, Devonport Historical and Museum Society.<br />

The eruptive period formed three volcanic cones. First was Takapuna (<strong>North</strong> Head), initially a tuff cone<br />

before its crater filled with scoria, spilled over its rim and buried it. Next came a fire mountain, Takararo<br />

<strong>North</strong> <strong>Shore</strong> <strong>Heritage</strong> - <strong>Thematic</strong> <strong>Review</strong> <strong>Report</strong><br />

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