Fossil shells, Putangirua Pinnacles, New Zealand, North Island. When ocean levels were much higher 7 to 9 million years ago, the Aorangi Ranges were an island which deposited large alluvial fans at the seashore. Conglomerate rock formed in layers. Erosion over the past several thousand years created a badlands of earth pillars (or hoodoos) at the head of this valley in the Aorangi Ranges.
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