Abstract
Isotopic dating suggests that four major glacial cycles have occurred within the past half-million years, whereas no more than two cycles are generally recognized from the preceding one and a half million years. This change of duration, which provides a test for theories of ice ages, cannot be directly explained by existing theories of oscillating geo-climatic systems without introducing tectonically induced physiographic changes: such changes seem to affect chiefly the oscillation period of Ewing and Donn's system incorporating alternate icing and de-icing of the Arctic ocean.
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CHAPPELL, J. Changing Duration of Glacial Cycles from Lower to Upper Pleistocene. Nature 219, 36–40 (1968). https://doi.org/10.1038/219036a0
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DOI: https://doi.org/10.1038/219036a0
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