National Geographic : 1964 Feb
And we noted a gradual change in mate rials. First, the Indians used sand, or some times crushed rock, as "temper," material added to the raw clay for strength. Later, by the 10th century, ground-up pottery was used. Doubtless, it was far easier to get. Anyone can find similar cultural change in his own city dump, if he is stout-stomached enough to dig into it. The lower layers of a long-established dump might show no tin cans, for example. Later, hand-soldered ones appear. Then machine-sealed cans appear 182 suddenly and grow exceedingly common. But in the layers laid down during World War II, cans are rare-we were carefully saving them to be melted down. (That layer may drive archeologists to distraction some day!) Post war, the dump would reveal the emergence of new containers, such as plastic. Under five rooms and a kiva of Long House, we found the remains of a large pit house, some 16 feet in diameter. It was a happy home about 650, during the depths of Europe's Dark Ages. Six centuries later, the descendants of the pit-house dwellers lived out the last decades KODACHROMESBY WILLIAM BELKNAP,JR. I) N.A.5, Rappelling down a cliff, Jerry Melbye stops at a small, isolated chamber, possibly a grain bin. Double House, largest of Wetherill's "inaccessi ble" ruins, requires real rock-climbing skill for en try. Some 25 families occupied its several shelves.