One of the very deepest part of the countless canyon formations around the Öræfajökull stratovolcano present some bizarre phreatomagmatic formations. This pillar was most likely formed during a subglacial eruption during the pleistocene (last ice age) and the surrounding depths were eroded away by frequent fluvial erosion due to glacial outburst floods, then again I have no idea because I have never seen such a ridiculously good looking pillar in Iceland before.
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