. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. Man in the Making 11 The approximate age of the painted grottoes is also determined in part by the kind of bones and flint implements found in the rubbish that filled the caverns, thus protecting the pictures throughout thousands of years from exposure and destruction. Certain other time marks, such as paintings of different ages superimposed one above the other, tell the story of different hands that wrought them. All in all these early attempts at artist
. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. Man in the Making 11 The approximate age of the painted grottoes is also determined in part by the kind of bones and flint implements found in the rubbish that filled the caverns, thus protecting the pictures throughout thousands of years from exposure and destruction. Certain other time marks, such as paintings of different ages superimposed one above the other, tell the story of different hands that wrought them. All in all these early attempts at artistic expres- sion are direct evidences of the great antiquity of man, for of all creatures only man could have left such signs of the times. 4. Large Stone Monuments The ancient Egyptians who built pyramids, sphinxes, and obelisks in the attempt to outwit the devastating tooth of time, were not the first to leave some enduring memorial of themselves to succeeding generations. Prehistory, as well as written history, bears witness to the same human desire for impressing posterity. This desire has found expression not only in the form of mounds or earthworks of unmistakable human workmanship, but also of large stones, or megaliths, arranged and set up in various unnatural Fig. 82. Megaliths of Stonehenge. (After Quennell.) Large columnar stones set up on end are called menhirs. Of these over 700 have been located in Brittany alone. Primitive man must have exercised a good deal of engineering skill, probably by digging pits, building tempo- rary inclined planes, and using pulleys of some sort, in order to jockey these huge stones into position. Their size and shape preclude the possibility of their placement by any natural agency. Frequently menhirs were set up in parallel rows, termed alignments, or in circular arrangement, designated as cromlechs. A flat stone resting upon two uprights is called a trilith, but when several uprights support a top stone, like a rude table or a
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