Dating methods of pompeii
Some sites are explored provisionally by sampling cuts known as .
Large sites are not usually dug out entirely, although a moderate-sized round barrow may be completely moved by excavation.
The famous painted and engraved Upper Paleolithic cave of Lascaux in southern France was discovered by chance in 1940 when four French schoolboys decided to investigate a hole left by an uprooted tree.
They widened a smaller shaft at the base of the hole and jumped through to find themselves in the middle of this remarkable pagan sanctuary.
At Barnénès, in north Brittany, a contractor building a road got his stone from a neighbouring prehistoric cairn (burial mound) and, in so doing, discovered and partially destroyed a number of prehistoric burial chambers. Giot was able to halt these depredations and carry out scientific excavations that revealed Barnénès to be one of the most remarkable and interesting prehistoric burial mounds in western Europe.