Ancient civilizations-2

Incipient agriculture (6500–1500 bce)

The most crucial event in the prehistory of Mesoamerica was the human capture of the food energy contained in plants. This process centred on three plants: Indian corn (maize), beans, and squashes. Since about 90 percent of all food calories in the diet of Mesoamericans eventually came from corn, archaeologists for a long time have sought the origins of this plant—which has no wild forms existing today—in order to throw light on the agricultural basis of Mesoamerican civilization.

The search for Mesoamerican agricultural origins has been carried forward most successfully through excavations in dry caves and rock shelters in the modern southern Mexican states of Puebla and Oaxaca. Sequences from these archaeological sites show a gradual transition from the Early Hunting to the Incipient Cultivation periods. At the Guila Naquitz cave, in Oaxaca, there are indications that the transition began as early as 8900 bce; finds from caves in the Tehuacán valley of Puebla, however, offer more substantial evidence of the beginnings of plant domestication at a somewhat later time. There, the preservation of plant remains is remarkably good, and from these it is evident that shortly after 6500 bce the inhabitants of the valley were selecting and planting seeds of chili peppers, cotton, and one kind of squash. Most importantly, between 5000 and 3500 bce they were beginning to plant mutant forms of corn that already were showing signs of the husks characteristic of domestic corn.

One of the problems complicating this question of the beginnings of early corn cultivation is related to a debate between paleobotanists on wild versus domesticated strains. One school of thought holds that the domesticated races of the plant developed from a wild ancestor. The other opinion is that there was never such a thing as wild corn, that instead corn (Zea mays) developed from a related grass, teosinte (Zea mexicana or Euchlaena mexicana). In any event, by 5000 bce corn was present and being used as a food, and between 2,000 and 3,000 years after that it had developed rapidly as a food plant. It has been estimated that there is more energy present in a single kernel of some modern races than there was in an ear of this ancient Tehuacán corn. Possibly some of this was popped, but a new element in food preparation is seen in the metates (querns) and manos (handstones) that were used to grind the corn into meal or dough.

Beans appeared after 3500 bce, along with a much improved race of corn. This enormous increase in the amount of plant food available was accompanied by a remarkable shift in settlement pattern. In place of the temporary hunting camps and rock shelters, which were occupied only seasonally by small bands, semipermanent villages of pit houses were constructed on the valley floor. Increasing sedentariness is also to be seen in the remarkable bowls and globular jars painstakingly pecked from stone, for pottery was as yet unknown in Mesoamerica.

In the centuries between 3500 and 1500 bce, plant domestication began in what had been hunting-gathering contexts, as on the Pacific coast of Chiapas and on the Veracruz Gulf coast and in some lacustrine settings in the Valley of Mexico. It seems probable that early domesticated plants from such places as the Tehuacán valley were carried to these new environmental niches. In many cases, this shift of habitat resulted in genetic improvements in the food plants.

Pottery, which is a good index to the degree of permanence of a settlement (because of its fragility it is difficult to transport), was made in the Tehuacán valley by 2300 bce. Fired clay vessels were made as early as 4000 bce in Ecuador and Colombia, and it is probable that the idea of their manufacture gradually diffused north to the increasingly sedentary peoples of Mesoamerica.

The picture, then, is one of growing human control over the environment through the domestication of plants; animals played a very minor role in this process, with only the dog being surely domesticated before 1500 bce. At any rate, by 1500 bce the stage was set for the adoption of a fully settled life, with many of the sedentary arts already present. The final step was taken only when native agriculture in certain especially favoured subregions became sufficiently effective to allow year-round settlement of villages.