#muriwai
20171225 - Muriwai, Auckland: Some of my favourite photographs. Please excuse my indulgence in reposting these.
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Coastal cliff erosion can create pillars when rock jointing or faulting are spaced at favourable intervals and angles. These will continue to be sculpted by the waves and often become tourist hotspots (such as the Twelve Apostles in Australia) or a refuge for sea birds, which can nest safely from predators.
Gannet colony at Muriwai, New Zealand
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Inside the plumbing system of an ancient volcano
A fossil plumbing system of an ancient Waitakere Volcano. Though the volcano went extinct and was largely eroded away, the lava flows that once spew from it are now preserved along the Maori Bay coast. The radial feature is an internal view of lava flow lobe that shows rosette style columnar jointing. This feature forms when large lava flow moves and cools slowly, allowing columns to grow, which at the same time are bent due to ongoing lava movement.
Muriwai, New Zealand
A detailed description of this flow is available in the following article:
Bear, A.N. and Cas, R.A.F., 2007. The complex facies architecture and emplacement sequence of a Miocene submarine mega-pillow lava flow system, Muriwai, North Island, New Zealand. Journal of volcanology and geothermal research, 160(1-2), pp. 1-22.
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