Oldest Roman Camp of Northern Hispania Found in Portugal
Sections of the Roman camp wall foundations were dated with a new technique known as “optically stimulated luminescence” (OSL). In physics, OSL is a method for measuring doses from ionizing radiation and this made it possible for the scientists to assess the last time quartz crystals in the foundations were exposed to sunlight, revealing how long they were buried under the walls, thus, disclosing the date of the wall’s construction. Lomba do Mouro is the oldest scientifically identified Roman camp to date in northern Hispania. It was constructed by around 10,000 Roman troops. The ...
Source: ancient-origins.net