Lahar deposit rock sample
Cross section through a lahar deposit rock sample found in the proglacial area of Breidamerkurjokull, an outlet glacier of the Vatnajokull icecap in southeastern Iceland. Sub-angular clasts of various volcanic rock types were deposited after a flood and later solidified to form this rock. Dark basaltic clasts contrast with lighter coloured components with higher silica content. The image is about 15 centimetres wide.
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