The third major discovery of classic Folsom artifacts came officially in 1934, when Roberts dug a site called Lindenmeier in Colorado; but as far back as 1924—two years before the first discovery of a Folsom point in New Mexico—Judge C. C. Coffin and his son, A. L. Coffin, had begun to pick up such points in this area without recognizing their importance. Lindenmeier is particularly significant because it was an occupational site, a camp of some duration. It was also a factory, for Roberts found spear points, scrapers, and other tools in various stages of manufacture. Again there were bison bones.[16] There were also traces of camel, as well as an elephant tusk not too closely associated with the artifacts. A skillful geological study of the old and elevated river terrace on which the site is located linked it with glacial moraines which indicate a readvance of the glacial ice.[17] The date of Folsom man is uncertain. Some believe he lived during the last years of the Great Ice Age. Some place him a little later than the melting of the glaciers. The earliest radiocarbon date yet determined for Folsom is from the Lindenmeier site, where bits of charcoal provided a date of 10,780 ± 375 years.[18] It took about 700 man-hours of tedious and painstaking work to locate and recover this charcoal. Elsewhere, at such Texas sites as Blackwater Draw, Lubbock, and Scharbauer, direct or indirect dates indicate a survival of the Folsom culture until about 9,000 years ago. One thing is certain: the Folsom point won the battle for early man in the Americas because it proved that he or his predecessors had hunted extinct bison, camels, mammoths, peccaries, and horses. Hitherto every find of human artifacts with fossils had been thrown out of court on the argument that the artifacts might be intrusive. That charge could not be leveled at two of these unique Folsom points because they were found in a unique and decisive position—one between the ribs of an animal and the other penetrating the channel of the spinal cord. Some of the opponents of early man were not convinced. They shifted the argument. Man was early, the Hrdličkas admitted, but not so very early, because the bison and the elephant were late. More of that in a later chapter. Meantime, it is worth noting that a humble invertebrate, a mollusk, found in the Clovis dig, suggests that the Folsom-bearing deposits were glacial.[19] [Illustration: BURIALS IN THE OLD WORLD AND THE NEW _Disposal of the dead by exposure, as practiced among hunting tribes. (After Sollas, 1911.)_]