Adaptive kernel density estimation reveals possible gaps in geomagnetic reversal record
A revised statistical reconstruction of Earth’s magnetic polarity history suggests that some short-duration geomagnetic reversals may be absent from the Geomagnetic Polarity Time Scale, particularly during four intervals following the Cretaceous Normal Superchron approximately 83 million years ago. The study, published in Geophysical Research Letters in 2026, applies a cross-validated adaptive-bandwidth kernel density estimation method to analyze reversal frequency in the GPTS 2020 dataset. The results identify localized dips in modeled reversal frequency that may correspond to undocumented short-lived polarity switches.










