Wikipedia:Map data/Northern North Island Volcanics/key

<-Map data/Northern North Island Volcanics Modified volcanics by erosion, alluvial action and sedimentary rocks are not shown to minimise complexity. The data is complimentary to Map data/South Island Volcanics. The data on distribution and volcanic rock type is by default from NZ 1:250K Geological GNS science but often detail is from original academic work and updates of this. Some simplification was undertaken and the distribution diagrams are certainly approximate. To a degree it is a work in progress with errors likely, although it will sometimes improve on standard sources. Basalt data for example, more often relies on classification before the Le Maitre 2002 classification compared to the companion map to support the article on South Island surface volcanism and is open to improvement by geologists or when academic updates come out. Significant situations that are likely to require this map to need correction, arise in the Bay of Plenty region, such that the Chimpanzee and Pokai ignimbrites near Tauranga appear to have been historically misclassified as Mamaku ignimbrite, the Papamoa formation's five ignimbrites have been better understood and mapping near Waihi is over simplified. So it is likely that these will need correction in due course. Names for flows where a volcanic vent is unnamed or use could be confusing is based on a nearby feature in NZTopoMap and authors own knowledge of likely usual access routes. General age context from the University of Waikato 2015 - Cenozoic sedimentary and volcanic rocks of New Zealand: A reference volume of lithology, age and paleoenvironments with maps (PMAPs) and database compilation. Other specific academic references include:
 * 1) Ages of the Pliocene—Pleistocene Alexandra and Ngatutura Volcanics, western North Island, New Zealand, and some geological implications (ages)
 * 2) Supplement to
 * 1) Ages of the Pliocene—Pleistocene Alexandra and Ngatutura Volcanics, western North Island, New Zealand, and some geological implications (ages)
 * 2) Supplement to
 * 1) Ages of the Pliocene—Pleistocene Alexandra and Ngatutura Volcanics, western North Island, New Zealand, and some geological implications (ages)
 * 2) Supplement to
 * 1) Ages of the Pliocene—Pleistocene Alexandra and Ngatutura Volcanics, western North Island, New Zealand, and some geological implications (ages)
 * 2) Supplement to
 * 1) Supplement to
 * 1) Supplement to

Technical Note
The master map of North Islands Surface Volcanics takes 5 seconds to render first time. There is a cut off of 10 seconds built into wikipedia for such scripting. So do not render twice on same page. The full map data probably best should not have controlling logic added as this might paradoxically add to rendering time and another approach has been taken (eg code on Reporoa Caldera page. Controlling logic also increasing debugging complexity of JSON and this data may be updated to correct oversimplification or mistakes. The companion map of South Island Surface Volcanism was separated off as rendering both on same page exceeds the 10 second limit. Once rendered Wikipedia serves up an image file of the map which is much faster but can lose detail. Detail is always revealed by clicking on the map.

Key
Clicking on the map enlarges it, and enables panning and mouseover of volcano name/wikilink and ages before present. Key for the volcanics that are shown with panning is: (shades of brown/orange),, {{legend|#dd6600|undifferentiated basalts of the Tangihua Complex in Northland Allochthon,}}, {{legend|#bb00bb|dacite,}} (shades of red), , {{legend|#ff00ff|rhyolite, (ignimbrite is lighter shades of violet),}} and. White shading is selected caldera features.