The magnetic reversal record is not periodic

Magnetic Polarity Transitions and Biospheric Effects

“…However, later analysis of reversal records by e.g. Lutz (1985) shows that the apparent harmonic structure of in polarity transition records is just an artefact of the data base used. As the data bases have been improved over the last decades the questions remains: Do polarity transition time series exhibit periodic behavior?…”

Was theEubrontesTrack Maker Gregarious? Testing the Herding Hypothesis at Powder Hill Dinosaur Park, Middlefield, Connecticut

“…Lutz 1985) is used to search for periodicity in point event series such as earthquakes, volcanic eruptions, and mass extinctions (e.g. Rampino & Caldeira 2015).…”

“…Wrapping correction: Lutz (1985) described a correction for non-integer number of wraps causing some points to be over-represented. This correction, optional in Past, gives a jagged appearance of the spectral curve and seems to work best for relatively large numbers of points (N>20).…”

Analytical Biogeography

“…Stimulated by these reports, Raup (1985a) analysed the earth's magnetic field record over the last 165 Myr and identified a periodicity of 30 Myr intervals. Lutz (1985) demonstrated that Raup's 30 Myr signal is an artifact of the geologic time scale, hence an accident of the length of the record, leading Raup (1985b) to retract his view. Lutz (1985) demonstrated that Raup's 30 Myr signal is an artifact of the geologic time scale, hence an accident of the length of the record, leading Raup (1985b) to retract his view.…”