Stable isotope, fossil coleoptera and pollen stratigraphy in late quaternary sediments from Ontario and New York State

Fritz, P.; Morgan, A. V.; Eicher, U.; McAndrews, J. H. (1987). Stable isotope, fossil coleoptera and pollen stratigraphy in late quaternary sediments from Ontario and New York State. Palaeogeography, Palaeoclimatology, Palaeoecology, 58(3-4), pp. 183-202. Elsevier 10.1016/0031-0182(87)90059-9

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Stable oxygen isotope contents of marl deposits and molluscs from lakes and ponds in northern New York State (U.S.A.) and southwestern Ontario (Canada) are remarkably uniform for carbonates formed between about 12,600 yr B.P. and 2000 yr B.P.. This suggests relatively stable climatic conditions with slowly increasing temperatures throughout this time span, an observation already indicated by fossil beetle data; and re-confirmed by additional data presented in this paper. The variations seen in pollen diagrams probably are related to plant colonization, and climatic parameters such as changing humidities.

This contrasts sharply with observations made in Europe where variations in pollen diagrams are paralleled by changing 18O contents in lacustrine marls and molluscs which clearly reflect climatic/temperature changes during late glacial and early postglacial times (13,500–9000 yr B.P.).

13C contents in marls and molluscs are not directly dependent on climatic change but reflect changing environments with varying aquatic and terrestrial carbon contributions.

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