There is evidence that energy from the Earth's accumulation caused the surface to be molten.
Further, the processes of erosion and crustal recycling have apparently destroyed all of the earliest surface.
Rocks of this age are relatively rare, however rocks that are at least 3.5 billion years in age have been found on North America, Greenland, Australia, Africa, and Asia.
While these values do not compute an age for the Earth, they do establish a lower limit (the Earth must be at least as old as any formation on it).
, (1) Department of Mineralogy, TU Bergakademie Freiberg, Brennhausgasse 14, Freiberg, D-09599, Germany, [email protected], (2) Scienze della Terra, dell'Ambiente e del Territorio, Universit degli Studi di Napoli, Federico II, Via Mezzocannone 8, Napoli, 80134, Italy, (3) Federal Institute for Geosciences and Natural Resources, Stilleweg 2, Hannover, D-30655, Germany Session No. 425© Copyright 2013 The Geological Society of America (GSA), all rights reserved.