Building on a previous study conducted at a single Bronze Age burial site in the Outer Hebrides in Scotland, Tom Booth from University of Sheffield used microscopic analysis to compare the bacterial bioerosion of skeletons from various sites across the UK with the bones of the mummified bodies from Yemen and Ireland.
The damp British climate is not favourable to organic materials and all prehistoric mummified bodies in UK will have lost their preserved tissue if buried outside of a preservative environment such as a bog, researchers said.
"We know from previous research that bones from bodies that have decomposed naturally are usually severely degraded by putrefactive bacteria, whereas mummified bones demonstrate immaculate levels of histological preservation and are not affected by putrefactive bioerosion," said Booth, who is now at the Department of Earth Sciences at London's Natural History Museum.
Earlier studies have shown that mummified bones found in Scotland were not entirely consistent with mummified remains found elsewhere because there was not a complete absence of bacterial bioerosion.
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Their examinations showed that both the Yemeni and Irish mummies showed limited levels of bacterial bioerosion within the bone and therefore established that the skeletons found in the Outer Hebrides as well as other sites across Britain display levels of preservation that are consistent with mummification.
Researchers also found that Bronze Age Britons may have used a variety of techniques to mummify their dead.
"Other techniques could have included evisceration, in which organs were removed shortly after death," he said.
"The idea that British and potentially European Bronze Age communities invested resources in mummifying and curating a proportion of their dead fundamentally alters our perceptions of funerary ritual and belief in this period," Booth said.