Assumptions

(Modified from John Grehan's Panbiogeography website)
  1. Points of ocurrence of species (georeferenced locality records) constitute an empirical database for biogeographical analyses.
  2. Distribution patterns provide information about where, when, and how biological organisms evolve.
  3. The spatial and temporal component of these distribution patterns can be graphically represented as dot maps and distribution graphs (tracks).
  4. 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.