when meltwater and associated suspended sediment input is reduced, and often when the lake surface freezes, fine clay-size sediment is deposited forming a dark coloured laminaset. In addition to seasonal variation of sedimentary processes and deposition, varve formation requires the absence of bioturbation. Consequently, varves commonly form under anoxic conditions. A well-known marine example of varved sediments are those found in the Santa Barbara basin, off California. Another long record of varved sediments is the palaeo-lacustrine record of the Piànico–Sèllere Basin (southern Alps). Here, the detrital layer part of each varve was used as a proxy for 771 palaeofloods which occurred over a period of 9.3 thousand years during an interglacial period in the Pleistocene. See also References Further reading De Geer, G. (1940), Geochronologia Sueccia Principles. Kungl. Svenska Vetenskapsakademiens Handlingar, Tredje Serien. Band 18 No.6. Lowe, J.J. and Walker, M.J.C. (1984), Reconstructing Quaternary Environments. Longman Scientific and Technical. Sauramo, M. (1923), Studies on the Quaternary varve sediments in southern Finland. Comm. Geol. Finlande Bulletin 60. Wohlfarth, B. (1996), The chronology of the Last Termination: A review of radiocarbon-dated, high-resolution terrestrial stratigraphies. Quaternary Science Reviews 15 pp. 267–284. Incremental dating Sedimentary rocks Climatology Sedimentology fi:Lustosavikronologia