The Cemetery under the Lava.
An ancient cemetery lying under lava has recently been explored in Copilco, a suburb of Mexico City. The lava swept down from Mount Ajusco in some cataclysm perhaps 3000 years ago, covering many square miles of territory to the depth of thirty or forty feet, and burying such villages as chanced to lie in its path. (See [Pl. VI]b). The discovery of human remains was made several hundred feet back from the original front of the lava flow in a quarry where lava rock was being removed to build roads. Tales of clay figurines found under the lava in this quarry had been current for years, but no serious investigation was made until human burials were met with in the earth under the great lava cap. Then a series of tunnels was dug and a considerable number of ancient burials were uncovered, but not moved from their original position. One now enters an electric-lighted graveyard and sees human bodies lying exactly as they have lain for untold centuries, with the funeral offerings beside them. This enormously important find gives us an historical level in mid-Archaic.
Another site, at Cuicuilco, on the opposite side of the lava flow, has received attention from archæologists. Here a great round mound rises in terraces faced with cobblestones. It is surrounded by the lava flow and some persons have assumed that the mound was already abandoned and in decay when the lava flow took place. Perhaps, however, the mound was built on a piece of land that the lava flow had spared. There are no contacts between the lava and the mound except at the ends of two projecting aprons or causeways. The pottery at this site is sufficiently different from that found at Copilco.
[Plate VI.]
(a) Cuicuilco. A view showing cobblestone facing of mound and lava in contact with apron or causeway.
(b) Archaic Site under Lava Flow near Mexico City. A local museum has been established at this site in electric-lighted tunnels.