Macrofossil, peat composition, LOI, radiocarbon, and permafrost data from a drained thermokarst lake, Old Crow Flats, Yukon

This dataset contains the data used for the scientific article "Post-drainage vegetation succession and basin floor evolution of a large thermokarst lake, Old Crow Flats, Yukon", submitted to Catena (Chiasson et al., 2026, in submission). Peat and soil samples were collected at the end of August 2022 from the margin and centre of a drained thermokarst lake basin in Old Crow Flats, Yukon, Canada. Samples were collected to reconstruct local vegetation histories based on macrofossil records, with selected samples from specific stratigraphic levels subjected to radiocarbon dating. Peat samples were collected as vertical profiles down to the basal layer. These included peat monoliths and frozen peat cores if the basal layer was below the permafrost table. Soil samples were also collected below the basal layer to characterize the pre-drainage conditions. The dataset includes macrofossil counts, peat matrix composition, loss-on ignition (LOI), radiocarbon ages, calibrated ages, age-depth models, accumulation rates, and simulated permafrost aggradation depth.