Underground tunnels created by lava flows provided humans with shelter for thousands of years beneath the hot desert landscape of Saudi Arabia
Archaeologists have found evidence of human habitation within lava tubes for the first time, in the deserts of northern Saudi Arabia.
Lava tubes are caves that form during a volcanic eruption. The surface of a river of lava cools and solidifies, while hot molten rock continues to flow beneath it. Eventually, lava drains out of the tube, leaving behind a tunnel.at Griffith University in Brisbane, Australia, and his colleagues excavated a trench inside Umm Jirsan. At 1.5 kilometres in length, it is the biggest lava tube in Saudi Arabia.
Stewart and his team have worked in the region for more than 15 years and have previously found numerous stone structures on the surface, confirming human habitation. However, the desert’s hot, arid climate has caused organic material to break down, making it difficult to date. On the surface, the landscape is a “hot, dry and flat basalt desert”, says Stewart. “But when you are down in the lava tube, it’s much cooler. It’s very sheltered and it would have been a great place of refuge.”In parts of the underground network at Umm Jirsan, the researchers also found human bones, but these are thought to have been dragged in by hyenas.
In other lava tubes nearby, Stewart and his colleagues found rock art, including representations of domestic sheep and goats that would have been made by “cultural contemporaries” of the groups using the lava tubes as a refuge, he says.“As a scientist who works primarily in caves, I am excited that we have another type of cave system being used by past human populations,” says Morley.
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