Abstract
Constructing a time-line of events in the co-evolution of life, climate and landscape demands less of data than correlating in detail all the stratigraphic sections that provide data. A wide range of information can be included without overstating the fidelity of any of it. Computer algorithms build global time-lines from thousands of local observations of stratigraphic superposition and supply explicit uncertainty statements about the position of each event in the time-line. Community databases and on-line search engines ease the compilation of data. There remains a need to analyze more stratigraphic sections for multiple fossil clades and to publish chemostratigraphic data more often against raw taxon range charts rather than derived biozone boundaries. Better algorithms would handle both unique and repetitive events.
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