main idea. A. Between 1500 B.C. and 100 B.C., the Olmecs developed complex ceremonial centers, an extensive agricultural and trading economy, and a highly distinctive art. B. Early in their history, the Olmec left the fertile gulf plain and moved to Teopantecuanitlan. C. The frequent reappearance of Olmec images in the art of the Maya and Aztecs suggests that the Olmecs gave rise to these later civilizations. D. The Kunz axe, once linked with Maya culture after being found at an ancient Maya site, was eventually attributed to Olmec artists. E. Many cultural innovations are now attributed to the Olmecs that were once attributed to other Mesoamerican cultures, including the calendar used by the Maya. F. Olmec art involved a complex symbolic code, including various animal images and the howling baby seen on the Kunz axe and elsewhere, that was used consistently for a thousand years.