ABSTRACT
The patterning of change followed a parallel course, channeled by similar adaptive pressures and opportunities, and influenced by the interchange of a variety of cultural elements throughout the prehistoric period. The fact that the Intermediate Area, which has a predominantly tropical climate, failed to reach an equally high level of cultural complexity in spite of continuous exposure to influences from America and the Intermediate Area Nuclear Areas argues forcefully for the interpretation that environment was the more significant variable. More detailed knowledge of the cultural sequences in both areas has made it increasingly evident, however, not only that a great deal of interchange took place but that it began at a relatively early time. Influences that trickled across the terrestrial frontiers into Central America and Colombia and over the water to the Greater Antilles enriched local cultures, but failed to catalyze the development of significantly greater complexity.
