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Archaeological fieldwork is necessary to determine what the gates are and when, exactly, they date to, Kennedy said.

Travis Hearn, a research assistant with the Aerial Photographic Archive for Archaeology in the Middle East, contributed to the journal article; and Kennedy also worked with members of the Desert Team, a group of Saudi Arabian citizens who were the first to map some of the stone structures and visit some of the sites.

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"Gates are found almost exclusively in bleak, inhospitable lava fields with scant water or vegetation, places seemingly amongst the most unwelcoming to our species," Kennedy wrote.

Thousands of years ago, he noted, the landscape was more hospitable to human life.

The lava domes are no longer active, Camp said, adding that in the past, basaltic lava covered some of the stone structures, including the gates.