Peat bogs, which cover 3% of the world’s land surface, are special places. While historically often considered as worthless morasses, today they are recognised as beautiful habitats providing environmental benefits from biodiversity to climate regulation. However, they are threatened by drainage, land reclamation for agriculture, and peat cutting for fuel, which has significantly reduced the extent and condition of these ecosystems on a global scale. Bogs are fragile and sensitive to change, whether by human hands or by processes such as climate change.
A less well known aspect of bogs is their remarkable archaeological potential. In their undisturbed state at least, bogs are anoxic (oxygen-free) environments due to their saturation. These conditions are hostile to the microbes and fungi that would normally decay organic material such as the remains of plants, which are the principal constituents of the peat. The same anoxic conditions also offer protection from decay for organic archaeological remains. The vast majority of objects and structures used by our ancestors were made from organic materials (in particular wood). These are normally lost on dryland archaeological sites but can be preserved in peatlands.
The saturated conditions mean that even soft tissue can survive, including both skin and internal organs. Probably the best known archaeological finds are the remains of “bog bodies” such as the famous prehistoric Tollund Man in Denmark, Lindow Man in the U.K., or the more recent Irish discoveries of Clonycavan Man, Old Croghan Man and Ireland’s oldest known bog body, Cashel Man, dated to the Bronze Age.