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and widening the Pakuranga-Panmure Highway will soon add further lanes through the side of
Panmure Basin.
On-going issues include vigilance to ensure that work to install lights at the end of
Auckland airport’s proposed second runway do not damage Ihumatao fossil forest buried
beneath volcanic ash from Maungataketake; marine erosion around the end of Brett Ave and
the threat this and erosion retardation endeavours pose to this part of Takapuna fossil forest
preserved in a Pupuke lava flow; the impacts of further building on the upper slopes of Mt
Hobson, Mt St John and Mt Eden.
New issues of concern arise every year. This year GSNZ has been called on to
comment upon Watercare proposals to replace reservoirs and pipes on several cones; we have
sent in a submission opposing a resource consent application to build apartment blocks on the
Orakei Basin tuff ring; prepared another submission proposing new protected sightlines
between the tops of the more accessible cones, and of Orakei and Panmure Basins; and
advocated public purchase of Pukaki Lagoon crater as this private land has been put up for
tender.
In the near future, the big remaining issues will be to try and achieve full protection
for the three volcanoes that are still largely intact, but in private ownership (Crater Hill,
Pukaki Lagoon, Puketutu). One measure that might assist with this and in defending that
which is already protected or scheduled, would be to achieve a greater level of recognition for
the value of Auckland’s volcanic heritage. This would happen if the field and its associated
prehistoric archaeological sites were to be given World Heritage status (something GSNZ first
proposed in 1992). At present the Department of Conservation is considering a number of
nominations to select several to be forwarded to the world body for consideration.
Looking positively on the future, maybe we can envisage restoration of some of
Auckland’s volcanic landforms. We already have Mangere Lagoon and now Puketutu looks
likely. Other cones that still could be rebuilt, guided by old photographs, include Pukeiti and
Otuataua (both in Otuataua Stonefields Historic Reserve), Wiri Mt (crown-owned disused
quarry site), Maungataketake (still being quarried below ground level, private), Crater Hill
scoria cone and tuff ring (private), and Three Kings cones (still being quarried below ground
level). More difficult but possible could be Mt Cambria, Little Rangitoto and the top of Mt
Albert (all in public reserves, but surrounded by rich residential housing). Conceivably the
floors of Pukaki Lagoon (iwi owned) and even Onepoto (public reserve) could be restored to
tidal inlets.
References:
Collins, B.W. 1957: Preservation of Auckland’s volcanoes. Geological Society of New
Zealand Newsletter 3: 10-11.
Fowlds, G.M. 1928: Auckland’s unique heritage: Report on preservation of volcanic cones
and craters, Auckland. Auckland Town Planning Association, 26 pp.
Hochstetter, F. von, 1864, Geologie von Neu-Seeland. Beitrage zur Geologie der Provinzen
Auckland und Nelson., Novara-Expedition, Geologie Thiel 1 (1), 274 pp.
GSNZ Newsletter 143 (2007) Page 39