Charles Seignobos,
History of Ancient Civilization
“ Their vases were poorly burned, turned by hand, and adorned with but few lines. Like the cave-men, they used knives and arrows of flint; but they made their axes of a very hard stone which they had learned to polish. This is why we call their epoch the Polished Stone Age. They are much later than the cave-men, for they know neither the mammoth nor the rhinoceros, but still are acquainted with the elk and the reindeer. [2] Megalithic Monuments.—Megalith is the name given to a monument formed of enormous blocks of rough stone. Sometimes the rock is bare, sometimes covered with a mass of earth. ”
