"Researchers found microplastics in soil deposits more than seven meters (23 feet) underground, which were deposited in the first or second century CE and excavated in the 1980s, a team led by researchers from the University of York in the United Kingdom said in a statement published Friday.
In total, the study identified 16 different microplastic polymer types in contemporary and archived soil samples, the statement adds.
“This feels like an important moment, confirming what we should have expected: that what were previously thought to be pristine archaeological deposits, ripe for investigation, are in fact contaminated with plastics, and that this includes deposits sampled and stored in the late 1980s,” John Schofield, a professor and director of studies in the University of York’s Department of Archaeology, said in the statement."
“Our best-preserved remains—for example, the Viking finds at Coppergate (in the city of York)— were in a consistent anaerobic waterlogged environment for over 1000 years, which preserved organic materials incredibly well,” he said in the statement.
“The presence of microplastics can and will change the chemistry of the soil, potentially introducing elements which will cause the organic remains to decay. If that is the case, preserving archaeology in situ may no longer be appropriate.”