Global geologic maps are tectonic speedometers--Rates of rock cycling from area-age frequencies Wilkinson, B. H. ; McElroy, B. J. ; Kesler, S. E. ; Peters, S. E. ; Rothman, E. D. Abstract Publication: Geological Society of America Bulletin Pub Date: May 2009 DOI: 10.1130/B26457.1 Bibcode: 2009GSAB..121..760W