Chapter I The Archaic Horizon
In 1910 an actual stratification of human products was found in the environs of Mexico City in which three principal culture horizons could be readily discerned. A collection made at the time, illustrating the objects characteristic of the three strata, is on exhibition in the American Museum of Natural History. In parts this stratification verified theories of culture succession already held by students working in this field. Since that time careful research in several localities has been carried on and many authentic specimens from the three layers have been brought together.
The stratigraphic series concerns sedentary life after the invention of agriculture. Presumably a nomadic horizon preceded that of the first farmers, but few traces of this have so far been reported from southern Mexico and Central America. The earliest known specimens of the lowest level are not rudimentary but are well stylized, and opinions vary as to the length of time necessary for a theoretical formative stage. It seems necessary to consider this old civilization as a stratigraphic unit admitting the probability that true beginnings await the archæologist’s spade.
The culture of the lowest stratum is here called archaic, a word meaning old, but not necessarily primitive. The word “horizon” carries an implication of chronological succession, but it would not be wise to insist that archaic remains everywhere represent a dead chronological level. Archaic art is oldest in its place of origin, the highlands of Mexico and Central America, and in or near this general region, it was first succeeded by higher types. On the margin of its distribution archaic art, or at least the most striking traits of archaic art, lasted into much more recent times, and in some places may even have survived till the coming of the Spaniards. Even when every allowance is made for independent expressions which may find nearly the same form, it seems that remarkable homogeneity and continuity can be demonstrated for products of the archaic civilization of the New World.
Most of the evidence of the old civilization consists of ceramic objects, but there is also some stonework including implements, ornaments, and crude statues. Common household pottery shows local variations, but as a rule the archaic wares can be recognized as such by qualities of paste, shape, and decoration. The motives are simply geometric or realistic and there is a lack of formalized designs. One process of decoration has wide distribution and seems to have been invented well along in the archaic period. This is the process of negative painting in which the lines of the decorative pattern, originally applied in wax or pitch, stand out in the natural surface color of the pot against an over-painted background. This “batik” pottery extends from central Mexico to northern Peru.
The most interesting and important objects of archaic art in clay are human figurines executed in peculiar styles. These not only reflect details of dress, etc., but also seem to stand for a set of religious ideas. Especially a type of figurine representing a nude female appears to be an agricultural fetish, symbolizing the fecundity of Mother-Earth.
Stratification of Remains
Atzcapotzalco was once an important center of the Tepanecan tribe situated on the shores of lake Texcoco. It was an early rival of Tenochtitlan, the Aztecan capital, and was conquered and partly destroyed in 1439. The principal modern industry of Atzcapotzalco is brick-making, and several mounds and much of the surface of the plain have been removed for this purpose. In the mounds are found many pottery objects of the late Toltecan period, while on the surface of the ground are encountered fragments of the typical Aztecan pottery in use when the Spaniards arrived.
The stratification of the plain varies in different places so far as the thickness of the different strata is concerned, but the order is always the same. At one locality it is as shown in Fig. 11. First comes a layer of fine soil of volcanic ash origin, probably deposited by the wind. This is five or six feet in thickness, yellowish at the top, and much darker towards the bottom, with streaks and discolorations. The Aztecan pottery is found close to the surface, while Toltecan pottery occurs in the middle and lower sections. Underneath the soil layers lies a thick stratum of water-bearing gravel mixed with sand. This gravel stratum is possibly the old bed of a stream that formerly entered Lake Texcoco near this point. In some places it is fifteen or eighteen feet in thickness. Scattered throughout the gravel are heavy, waterworn fragments of pots as well as more or less complete figurines of the archaic type.
Temple mounds of Toltecan period. Surface finds of Aztecan period. Remains of Toltecan period. Deep stratum of water-bearing gravels containing remains of archaic period. Bed rock of hard clay.
At other sites, such as Colhuacan, the Toltecan layer is of greater thickness and the archaic layer of lesser thickness. The remains extend below the present level of the water and may indicate that considerable changes have taken place in the level of the lake. But we must remember that many of the ancient settlements were built over the water and that land was made in ancient times, as it is today in the gardens of Xochimilco, by deepening canals. Archaic remains are also common on the denuded tops of hills which may once have been covered by soil.
A stratification of archæological remains has recently been determined in Salvador.
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.
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