Microscopic fibres in soils: The accumulation of textile fibres and animal hairs at the 6th-11th-century CE Kvarnbo Hall settlement site on the Åland Islands, Finland

Microscopic animal and plant fibres detected in archaeological contexts are a valuable source of information regarding textile production, use-histories of artefacts and in studying mortuary practices. At the same time, recent research on microplastic pollution has revealed the ability of fibres to move even long distances and accumulate in various terrestrial and aquatic contexts. In this paper we discuss the accumulation of 100-1000 mu m-long animal hairs, bird feather barbules and textile fibres at Kvarnbo Hall, a Nordic Late Iron Age high-status settlement site in the angstrom land Archipelago, Finland. The hairs and barbules detected in soil samples reveal important information on the use of furs and downy feathers at the site. However, our study reveals that the microparticles sampled in the 6th-11th-century contexts represent not only the prehistoric phase of the site but can also be ascribed to the later land-use history of the area. We also speculate that long-distance air-borne particles might be one possible contamination source of fibres.