PASQUALE SORRENTINO / SCIENCE PHOTO LIBRARY PASQUALE SORRENTINO / SCIENCE PHOTO LIBRARY
Excavation of a prehistoric site. Archaeologist drawing a diagram of the layers of rock seen in the palaeolithic (Stone Age) archaeological site La Pineta. Another is scraping at the rock using a trowel. The rock layers can be used to date the site because they increase with age the lower they occur, with the oldest at the bottom. The oldest layer found so far (as of 2008) is believed to date back to 600,000 BP (before present), in the Pleistocene epoch. This is before modern man (Homo sapiens) existed. La Pineta is located near Isernia, in the Molise region of southern Italy.
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