Rift # 11, 2006 (Pseudocrator remnant, Reykjavik) The Rauðhólar (“red hills”) are remnants of a cluster of pseudocraters (when lava flows over wet ground to create a lava field, it heats up and creates eruptions of steam that burst through the lava). They are about 5200 years. American soldiers used soil from the pseudocraters to build an airstrip during WW II.