Geochronology and magnetostratigraphy of Paleogene North American land mammal 'ages': an update / Donald R. Prothero. Cenozoic South American land mammal ages: correlation to global geochronologies / John J. Flynn and Carl C. Swisher, III. Land mammal high-resolution geochronology, intercontinental overland dispersals, sea level, climate and vicariance / Michael O. Woodburne and Carl C. Swisher, III.