(Modified from John Grehan's Panbiogeography website)
- Points of ocurrence of species (georeferenced locality records) constitute an empirical database for biogeographical analyses.
- Distribution patterns provide information about where, when, and how biological organisms evolve.
- The spatial and temporal component of these distribution patterns can be graphically represented as dot maps and distribution graphs (tracks).
- Testable hypotheses about historical relationships between the evolution of distributions and earth history can be derived from geographical correlations between tracks and geological/geomorphological features.