 At the 100th anniversary of the discovery in 2007 a scientific commemorative publication complained that there "still existed no satisfactory exact data for the determination of the geological age of the lower jaw of "Homo heidelbergensis"".After all, in 1995 the age of the sands of Mauer 1 could approximately be determined on the basis of small fossils.Additionally, attempts were made to perform an absolute dating in yet accessible, adjacent sand mines.