The “Wairere Boulders” have been formed by a lava flow which turned into a 30 m thick basalt layer about 2.8 million years ago. A massive crack split the layer in half and the softer soil underneath started to erode. Consequent erosion created a huge accumulation of thousands of basalt boulders which now lie on the valley floor. The boulders’ surfaces are fluted due to chemical leaching, caused by soil acidity and tannin from Kauri leaves. Thanks to the construction of 22 wooden structures the boulder formation can be viewed from close. The stroll leads over, around and under the boulders, which are decorated by many native plants, lichens and fungi.
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