Titlebook: Environmental History and Palaeolimnology; Proceedings of the V J. P. Smith,P. G. Appleby,P. E. O’Sullivan Conference proceedings 1991 Spri

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Magnetic spherules in recent lake sediments,agnetic spherules are distributed regionally and hence form widespread cryptic marker horizons in lacustrine sediments. Location of this horizon in a lake sediment profile provides an approximate dating method and this horizon may be located using susceptibility measurements corroborated by microscopic spherule counts.

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Paleolimnology of Slapton Ley, Devon, UK,e uppermost sediments shows that the Ley has recently experienced a major shift in its trophic status, changing from a clear water, macrophyte lake to one dominated by plankton in a hypertrophic system. This last point is further amplified in the paper by Heathwaite & O’Sullivan (1991).

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,Edward Smith Deevey 1914–1988,y did not include the American Journal of Science, in which Ed had published his most important work. I had, however, been poking around the lakes and bogs of Nova Scotia for five years and was full of half-formed ideas about paleolimnology, climatic change, and the relevance of past climate to the