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  • Agricultural land use ; Common agricultural policy ; Environmental degradation ; Historical geography ; Human ecology ; Human impact ; Iceland ; Modelling ; Over-grazing ; Soil erosion ; Tephrochronology
  • observation of soil erosion, temporally defined by tephrochronology, to highlight the extent of land degradation during this period. The tragedy of the commons explanation of degradation is then assessed by evaluating historic documentary sources
  • C 14 dating ; Glacial surge ; Holocene ; Human occupation ; Iceland ; Quaternary ; Sandur ; Sedimentology ; Tephrochronology
  • ), the most recent prehistoric events in a series of Holocene floods in the Markarfljót valley, are securely dated by tephrochronology and radiocarbon dating to between c. AD 500 and c. AD 900. The environmental impact of these events would have been extensive