Long-Range Correlations in the Fossil Record and the Fractal Nature of Macroevolution

Ricard V. Solé, Susanna C. Manrubia, Juan Pérez-Mercader, Michael Benton, and Per Bak

98-11-096

Recent studies on the fossil record time series have shown that there is consistent evidence for self-similarity i.e., long-range correlations with power-law behavior. The existence of such fractal structures means that, when looking at a given time frame, some basic properties remain the same if a change of scale is performed. To sum up: there is no characteristic time scale, as we could expect if some type of periodic or other low-dimensional dynamics were present. A possible explanation for such long-range order is a dynamical process operating at all scales, as it is the case for systems in the neighborhood of critical points. In this paper these results are further explored by extending previous data analysis and examining the relevance of recent theoretical approaches to the statistical features of the fossil record.