2001: A marked clavicle

The original colectors had seen them in 1997, but when visitin Uruguay the Spanish palaeontologist Alfonso Arribas, from the Instituto Geominero in Madrid, observed that one of the remains, a clavicle of the sloth Lestodon, showed very interesting marks that might have been made by humans. Examined under microscope, they were observed to have features similar to those left by stone tools. Besides, they were predominantly located in zones of muscle insertions and with two main directions, nearly perpendicular to each other. From this, the first preliminary research led to a publication in a European journal. More information on the marks. More information on the marks.