Towards a benign reburial context: the chemistry of the burial environment

Abstract

The successful reburial of exposed archaeological remains depends on the ability to recreate a benign preserving environment, especially for the desiccated and waterlogged environments that preserve organic and other valuable archaeological material. An introduction to the chemistry of soil and the burial environment is provided, covering the key variables: water, oxygen, cations and anions, pH, organic matter, clay and redox potential. The problems of monitoring these variables and their variation are highlighted. Recent work in monitoring the long-term effects of burial and the steps taken towards modelling actual burial environment chemistry are outlined. Factors to be considered when adding material for reburial are proposed. These include: the avoidance of soluble or potentially soluble minerals; the beneficial buffering effect of clays and organic matter; the minimization of changes in water level, redox potential and pH; and the desirability of retaining the porosity of the burial medium. This can often be achieved by re-using the soil in which the objects/structures were originally buried.