Rauðhólar (Vesturdalur)
Rauðhólar (Vesturdalur) is a small chain of volcanoes within the Askja or the Fremrinámur volcanic systems in the north of Iceland. They are located at the lower course of the river Jökulsá á Fjöllum, around 25 km from Öxarfjörður fjord and at the same time near Vesturdalur in Jökulsárgljúfur National Park next to the ''Hljóðaklettar'' (the echo cliffs). Geology Hljóðaklettar and Rauðhólar The latter vents and Rauðhólar build together a small volcanic chain, consisting of eruption fissures which were active 11.000 years ago. Some of the fissures crossed the river. The river destroyed the craters of Hljóðaklettar and only remnants were left standing, dike (geology), dikes, volcanic plugs, Sill (geology), sills and lava flows. The erosion started with phreatomagmatic explosions during the eruption series, when water and magma met, but there was also steady fluvial erosion afterwards, incl. many big jökulhlaup. The volcanic edifices of Rauðhólar on ...
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