Fossil Biodiversity: Red Noise Plus Signal

Details Fossil Biodiversity: Red Noise Plus Signal Fossil Biodiversity: Red Noise Plus Signal

2006-06-13

arxiv.org/abs/astro-ph/0606325v2

Astronomy and Astrophysics

Astrophysics

3 page comment including one figure. corrected typo in abstract & figure caption

Scientific paper

We have examined the Fourier power spectrum as well as the Hurst exponent of extinction, origination, and total biodiversity in the marine fossil record, using a recently improved geologic timescale. We find all of them strongly inconsistent with past claims of self-similarity as well as inconsistent with random walk behavior. Instead, they are dominated by low-frequency power, with approximate f^-2 power over one decade in frequency. The spectrum turns over at about 10^8 y, lending plausibility to connections with galactic dynamics. Even in the background of this low-frequency dominance, a previously noted 62 My biodiversity cycle stands out with better than 99% confidence above the noise level, accounting for about 35% of the total variance in the fossil biodiversity record.

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