Excavations at the site of G-110: La Cabuya provide significant new data on the content and chronological position of the Machalilla culture. Trade pottery establishes its contemporaneity with the late period of the Valdivia culture, estimated at between 1800 and 1500 B.C. While seafood appears to have provided the main subsistence in both cultures, the ceramics and other artifacts are distinct. Machalilla pottery is well made, with thin walls and a high frequency of polished surfaces. Vessel shapes include carinated bowls and stirrup-spout jars. Typical decoration is by incision or thick red painting, separately or in combination, in simple but distinctive patterns. The Machalilla culture cannot be related to any of the known Formative complexes in Mesoamerica or South America, so that its origin cannot be suggested. Its termination was brought about by Mesoamerican contact, which added new traits to the Machalilla complex, producing the combination of elements characterizing the Chorrera culture.