Early Miocene c.20Ma

Early Miocene map

Norfolk Basin opening in far north and arc volcanism in Northland region. Southwards migration of subduction blocked by Chatham Rise. Alpine Fault propagated between subduction zone and oblique rift in south. Compression and development of fold-thrust belt (petroleum trapping structures) in central New Zealand. Uplift and expansion of land areas, rejuvenation of clastic supply and start of long-lived regression.

The present-day 2000 m isobath, which nominally marks the periphery of the New Zealand sub-continent, is used for reference (boundary between dark blue and mid blue). Bold line depicts paleo-coastline.

Colour coding: white = terrestrial non-deposition; green = terrestrial deposition; yellow = marginal marine sand-dominated facies; pale blue-grey = shelf; mid-blue = slope or submarine rise; dark blue = deep ocean. Faults, subduction zones, and seafloor spreading centres shown in red. Pink circles = active volcanism.

Basins depicted include: Taranaki (TB), East Coast (ECB), Canterbury (CB), Great South (GSB), and Western Southland (WS). NB = Norfolk Basin

To view individual maps, click below:

Download animation of all maps deforming in sequence over 65 million years.