Whangarei Urban Geology

Geological Summary

The geology of the city of Whangarei is notable for its diverse rock types spanning many different periods of formation. The area is founded in Mesozoic greywacke basement, which is overlain by mid Cenozoic coal measures and marine sedimentary rock with complexly in-faulted mudstone, sandstone and limestones overlying these. Rhyolite, dacite, andesite and basalt lava and scoria erupted onto this substrate in the Miocene to early Quaternary. River, swamp and lake sediments have accumulated in many flat and low-lying areas, with some areas of man-made fill deposits.

Whangarei Urban Geology
Geology of the Whangarei area

Maps and Information

There are no geological mapping projects underway or imminent in the Whangarei area. Previously completed maps include:

2001/2018: QMAP 1:250 000 geological map

For wider and more generalised geological context of the Whangarei area, a 1:250 000 geological map was printed with accompanying explanatory text. Digital GIS and image versions of the map are available on DVD. The digital version has since been updated in a national GIS dataset at that nominal scale. The underlying GIS datasets have rich feature attributes.

The QMAP 1:250 000 geological map image can be downloaded(external link) or interrogated through the geological map application(external link). For GIS users, the QMAP geological feature layers can be downloaded from GNS Science’s Web Map/Feature Service(external link)

2003: Urban 1:25 000 geological map

An area including the city of Whangarei is covered by a 1:25 000 geological map.

For GIS users, the layer NZL-Urban Whangarei geological units based on the White & Perrin (2003) map can be downloaded from GNS Science’s Web Map Service(external link).

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