Fig. 2: Cyclostratigraphic analysis of the datasets from the Narao section.
From: Synchronizing climate-carbon cycle heartbeats in the Phanerozoic vegetated icehouses
a Smoothed window averaging (SWA) background fitting for the power spectrum of gamma ray (GR) stratigraphic series, including the standard Chi-squared (Chi2) 99% confidence level (CL). b Evolutionary spectrogram of GR series (8-m-analysis window and 0.1-m steps). c SWA background fitting for the power spectrum of 405-kyr-calibrated GR series. d Evolutionary spectrogram of 405-kyr-calibrated GR series (1-Myr-analysis window width and 0.05-Myr steps). e SWA background fitting for the power spectrum of 405-kyr-calibrated carbonate δ13C (δ13Ccarb) series. f Evolutionary spectrogram of 405-kyr-calibrated δ13Ccarb series (6-Myr-analysis window width and 0.2-Myr steps).
