Fig. 4: Comparison between the radioisotopically anchored astronomical time scale and the international chronostratigraphic time scales. | Nature Communications

Fig. 4: Comparison between the radioisotopically anchored astronomical time scale and the international chronostratigraphic time scales.

From: Synchronizing rock clocks in the late Cambrian

Fig. 4

The age model was anchored to the U-Pb age of 486.78 ± 0.53 Ma for the Cambrian–Ordovician boundary11,47, and supported by the 481.13 ± 1.12 Ma for the uppermost Tremadocian28,47, and 488.71 ± 1.17 Ma for the upper Peltura scarabaeoides Zone29,47. The 405-kyr long orbital eccentricity cycles (red curve) were extracted using a bandpass Taner filter (passband: 0.00247 ± 0.00055 cycles/kyr).

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