From 1852 to 1854, Joseph Hekekyan, then working for the Egyptian government, conducted geological surveys on the site, and on these occasions made a number of discoveries, such as those at Kom el-Khanzir (northeast of the great temple of Ptah). These stones decorated with reliefs from the Amarna period, originally from the ancient temple of Aten in Memphis, had almost certainly been reused in the foundations of another ruined monument. He also discovered the great colossus of Rameses II in pink granite.