The standard approach to the application of spectral analysis in the search for orbitally forced cycles in stratigraphic data series involves comparing the power spectrum of the data with that of a statistical model representing (random) background noise. The discrimination of a (candidate) periodic cycle from random noise requires estimation of the statistical confidence that power at a given frequency in the spectrum is unlikely to be part of the noise. Andrews et al. (2016) made spectral analyses of natural gamma-ray (GR) data from onshore and offshore sections through the lacustrine Caithness Flags (Middle Devonian, Scotland), the offshore section comprising...

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