First evidence for human occupation of a lava tube in Arabia: The archaeology of Umm Jirsan Cave and its surroundings, northern Saudi Arabia
Fig 2
Photographs of the Umm Jirsan Cave and interior sections of the lava tube.
Top left, looking out of entrance to Umm Jirsan (Trench 1 just out of view on right). Top right, inside lava tube beyond Trench 1. Middle left, another example of a lava tube near Umm Jirsan. Middle right, Jebel Abyad area with obsidian clasts and lithics, beneath obsidian outcrops. Bottom, simple plan of the Umm Jirsan lava tube system with red star indicating the location of the Trench 1 excavation [modified from 40].