Mid- to late-Holocene vegetational and land-use change in the Hadrian's Wall region: a radiocarbon-dated pollen sequence from Crag Lough, Northumberland, England

The sequence is interpreted in the light of the archaeological record, particularly in relation to the impact of Roman military activity in the area. The most significant episodes of woodland clearance occurred in the late Neolithic/early Bronze Age period and then in the middle Iron Age, creating a patchwork of woodland, heather moorland, pasture and arable land by the Roman period. The main changes in the Roman period were a decline in the extent of Betula woodland and perhaps the local introduction of Secale cereale cultivation. Local land management practices involving fire seem to have been suspended in the Roman period, but resumed afterwards. The end of the Roman period may have been accompanied by a shift towards pastoral land-use and abandonment of less favourable agricultural land, but the effect was minor compared to that at other sites in the region. Later shifts in land use may relate to climate variability, as reconstructed from several mires in northern England.