This diagram is a reconstruction of how Torlesse greywacke and associated sediments formed at the edge of the Gondwana supercontinent. Rivers carried sediment from land out to sea on the continental shelf, where it was then transported down channels as turbidity currents onto huge submarine fans on the deep ocean floor.
Te whakamahi i tēnei tūemi
Te Ara - The Encyclopedia of New Zealand
Artwork by Bruce Mahalski
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Source: Glen Coates, The rise and fall of the Southern Alps. Christchurch: Canterbury University Press, 2002