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Cores taken at Burrinjuck Reservoir in southeastern New South Wales have been dated using the first appearance ofOPb dating models reproduced the 'known' chronology. Correlation analysis shows no significant relationship between original "Pb (unsupp.) concentration and grain-size, sedimentation rate or loss on ignition. Differences in sediment source may explain the variations in OPb. A simple provenance model has been used to interpret the ratio of original 'OPb (unsupp.)/226Ra as a tracer of topsoils and subsoils. High ratios in the reservoir sediments probably indicate eroded topsoils and low ratios eroded subsoils. 37Cs, charcoal/bushfire correlations, and annual grass pollen peaks. None of the main KEY WORDS zloPb in sediments Chronology Tracer Soil erosion Sediment accumulation Australia c 20 40

Pollen analysis is widely used to reconstruct vegetation and land use histories, but can also provide sedimentological information . At Burrinjuck Reservoir, in south-eastern Australia, annual grass pollen peaks are used to distinguish each year's sediment, even when there are no visible laminations . In conjunction with other dating methods, this allows the determination of year by year influxes of all sediment components . Pollen grains in the Burrinjuck sediments are shown to be predominantly waterborne so that they can be used to trace sediment to its source in particular vegetation stands . Pollen concentration and the proportion of damaged pollen might also distinguish sediment eroded from topsoils and that from subsoils . Pollen analysis can thus be used to locate specific erosion events in both time and space .

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