Despite more than two decades of extensive and highly productive research programs by a series of institutions and individuals focusing specifically on the Preclassic archaeology of the Belize River Valley, understanding and appreciation of the region's ceramic tradition and interpreted culture history today effectively remain based on, and dependent on, unmodified conceptual formulations from the 1940s through the 1960s. These incorporate a view of the zonal Preclassic ceramic sequence as the physical embodiment of a uniform and even unitary local producer-consumer system tied directly and genetically to the later Classic and Postclassic Maya inhabitants of the region. In this paper, we question both these assumptions and the soundness of the conceptual constructs (ceramic complexes) and framework (ceramic sequence) on which they are based. We examine the content and analyze the composition of the Belize Valley Middle and Late Preclassic ceramic complexes as dynamic, composite, producer-consumer circulation assemblages rather than as static, synthetic archaeological units, and we conclude that they reflect a much more complex socioeconomic, cultural, and sociopolitical landscape than has yet been recognized and appreciated by other investigators. We propose the presence and interaction within the valley during the Middle and Late Preclassic of at least two distinct dialectal, ethnic, or ethnolinguistic groups, and we argue that the local cultural tradition emerging in the area by the ceramic Protoclassic represented a ranked amalgamation of these. The paper also presents the first comprehensive and complete type-variety typologies for the Middle through Late Preclassic ceramic complexes of the upper Belize Valley, incorporating both new data from the 1980s and 1990s and substantive revisions of earlier work by