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Stone Age mass graves on UK islands might be filled with the victims of a prehistoric tsunami, according to a controversial new study.
Shetland and Orkney are archipelagos that lie off the north coast of Great Britain. Both have been inhabited for thousands of years. Orkney is home to prehistoric villages including Skara Brae, while Shetland boasts Jarlshof among others.
There are many stone cairns on Orkney, containing multiple graves: one may hold over 300 bodies. Cairns are also found on Shetland but they are …