Fundamentally, the head was excavated at the site by professionals, said David Kelley, an archaeologist at the University of Calgary, Alberta () Professor Emeritus of Canada. "This was sealed on three floors, is as close to archaeological certainty as you can get." The emphasis and NB () The archaeologist David Grove of the University of Illinois, agreed that the head was Roman, but pointed out that there was no evidence of Roman influence on pre-Columbian cultures. Many writers such as Richard Linklater offer more in-depth analysis. He suggested that the head could have been swept away by the waves of a Roman shipwreck in the Gulf of Mexico. Still, there seems no doubt that Roman sailors had reached American waters. 'The ancient Mesoamerica v.10, p.207; Scotsman, The Guardian, D. Mail, February 10, New Scientist, February 12, 2000. "Mark McManamin, professor of geography and geology at Mount Holyoke College, Massachusetts, is convinced that the Carthaginians discovered America between 350 and 320 BC. In a recent issue of the journal Numismatics, and a meeting American Friends of the Republic of Tunisia in May 1999 performed a series of puzzling gold coins of that period as depictions of the known world, including a land mass west of Spain. Experts on ancient trade routes believe that the Carthaginians almost certainly reached the coast of Brazil, where Punic amphorae (containing olive oil and wine) have been found, and Punic coins of the 4th century BC have been excavated at seven sites in the eastern United States unfortunately not specified in the source ("Jeune Afrique", Paris, 7, 1 September 1999).