Positive18O:16ONegative18O:16OSummary --- The oxygen isotopic proxy thus shows that northern hemisphere glaciation fluctuates in very regular periods.Advances and retreats every ~41,000 yrs from 1.8 Ma to 600,000 years ago.Since then, major changes have occurred at ~100,000 yr periods, lesser ones at ~23,500 yrs. Continuing with the analysis of the oxygenIsotope proxy, …………..
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Positive18O:16OAn analysis of the frequencies within the oxygen isotope curve reveals these 3 periods whose signals exceed noise!These periods must be explained to explain glaciation on this type of time scale.100,00021,00041,000Frequency (1/kyr)SignalAmplitudenoise