『Abstract
　We propose to characterize land-ocean distribution over Late Proterozoic to Phanerozoic times from measurement of perimeters and areas of continental fragments, based on paleomagnetic reconstructions. These measurements serve to calculate geophysically constrained breakup and scatter indexes of continental land masses from 0 to 1100 Ma. We then provide quantitative investigation and modelling of relationships between scatter of continental landmasses and mean age of the oceanic lithosphere during Mesozoic times, which appears to range from 56 to 62 Ma over the last 170 My. We then inverse the scatter of continental landmasses in terms of global oceanic crust mean age over the last 600 My, i.e. back in times where no measurement of seafloor accretion history is possible because of subduction. We finally show that the inferred evolution of oceanic lithosphere mean age over the Phanerozoic remarkably correlates in time with long-term sea-level changes since the Cambrian.

Keywords: Paleomagnetic reconstructions; continental breakup; seafloor mean age; sea-level; Neoproterozoic; Phanerozoic』

1. Introduction
2. Dispersal of continents
　2.1. Definition of dispersal indexes
　2.2. Breakup index B.I.
　2.3. Scatter index S.I.
3. Continental drift and Seafloor mean age at（aの頭に-）
　3.1. {0-150} Ma seafloor mean ages and scatter Index
　3.2. {0-600} Ma inferred seafloor mean ages
4. Discussion: a test with sea-level changes
5. Conclusions
Acknowledgements
Annex 1. Parameterization of mean seafloor ages and scatter index S.I. since 180 Ma
　A.1. Basic equations
　A.2. Seafloor weighted mean age
　A.3. Seafloor mean age vs. scatter index
Appendix A. Supplementary data
References