Coastal shell middens represent a well-known element of the archaeological record of island and coastal regions across the world and shellfish have been an important resource for subsistence since the mid Holocene. However, the factors that influence shell-fishing remain poorly understood and in many regions investigations into the role of shellfish gathering have often remained focused on prehistoric examples to the detriment of shell middens of later dates. This article reports on the

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... evidence for large-scale exploitation of shellfish during a hitherto understudied period for shell midden archaeology in Northwest Europe: the first millennium AD. The article includes a review of a series of previously unknown large mussel-dominated middens in eastern Scotland, an outline of their chronology and character, including Bayesian modelling of dates, and a synthesis of the emerging evidence for shellfish gathering in Northwest Europe during the first millennium AD. The research represents the first investigation of large-scale early medieval middens in Britain and the first review of their international parallels and the important new information they can provide for the early medieval economy.