A Twofold Problem
A mammoth in Colorado ... a giant sloth near Hoover Dam ... spear points of early man involved with both. Those two remote and spectacular animals roaming our own United States set our minds far back on the trail of time. The weapons, crude as they were and pitifully small, carry us forward again tens of thousands of years. We are describing the reaction of the layman who first learns of these things, but the opinions of science veer almost as widely when it tries to date the traffic of man and mammoth in the New World. The range is from 100,000 years ago to 2500 B.C.
The dating of the life of early man by the death of mammals now extinct is one of the major tasks that face the American prehistorian. It is doubly difficult because, in the first place, evidence of when these animals died off is only now becoming available, and, secondly, because we must also know how long man hunted them before they became extinct. We know that a few skulls have been found in strata containing the fossils of these animals, and we know that all but one of the skulls are longheaded and beetle-browed like those of the Australians and the Melanesians, instead of roundheaded like those of most Mongoloids. We know that Sandia, Clovis, or Folsom points have been found with the fossils of extinct elephants, horses, camels, and bison. If we knew when such mammals became extinct, we should know the latest possible date of most of the archaic skulls and of Sandia and Folsom man. But we should still not know just how much earlier some of these humans lived, or when they or their predecessors discovered America.
MAMMALS OF THE ICE AGE IN NORTH AND SOUTH AMERICA
A chart of the chief animals that became extinct after the arrival of man. The “extinct armadillo” is more correctly known as Dasypodidae. (After Colbert, 1942, with some rearrangement.)