Holarctic Landmass Rearrangement, Cosmic Events, and Cenozoic Terrestrial Organisms

Rearrangement of landmass configurations has profoundly affected the evolution of mammals and other organisms in the Northern Hemisphere.At the north end of the Atlantic Ocean, evidence is very strong for a now sundered landmass of Euramerica.This landmass existed toward the end of the Paleocene but ipi es to separate into at least two landmasses in eed resian ids ie the AME rn until the end of pene time.Thus at the end of the Paleocene and until some point vus pn in PomEocene, two land bridges may have simultaneously bec uns North America with sep parat e > parts of ride across the sd end of ne Atlantic: one dom tegen: the other by »» early knees of the Icelandic enne Possibly a isis ion from Asia and Europe to the northeastern end of North America existed at about 37 million a years paa (Ma) through the combined activities of the Yermak hotspot, waning compression between Greenland and Svalbard, and the dryi rying of Eurasian seaways.