Imagen obtenida de:https://sites.google.com/a/upr.edu/planetary-habitability-laboratory-upra/projects/visual-paleo-earth
un poco más de información en :http://www2.nau.edu/rcb7/globaltext2.html
o en http://freegeographytools.com/2011/photorealistic-views-of-the-earth-over-the-last-750-million-years