La Union Ceramic Horizon

The La Union assemblage belongs to the late Ceramic-period horizon of Hispaniola, a time when potting traditions, agriculture, and intensive coastal resource use shaped island lifeways. Archaeological data indicates the site dates to 1278–1403 CE, placing these individuals in the centuries immediately before sustained European contact. Ceramic traditions in the Caribbean have deep roots — archaeologists trace pottery-using, Arawakan-speaking groups into the Greater Antilles across many centuries — but local expression at La Union is a product of long-term regional processes of migration, innovation, and exchange.

Material remains from La Union (ceramic forms, food refuse, and habitation features) suggest community-scale activities and ties to inter-island networks. Limited evidence suggests these communities maintained mixed economies of cultivating root crops and exploiting coastal fisheries. The interplay of local adaptation and external influences created a recognizable La Union ceramic style, but regional variation means that care is needed when generalizing from a single site.

Because our genetic sample is small (three individuals), connections between cultural change and population movement remain provisional. Archaeological context from La Union, combined with DNA, offers vivid but tentative glimpses of the people who inhabited this stretch of Hispaniola on the eve of European contact.

Ancient DNA from three individuals excavated at La Union reveals a compact but meaningful genetic snapshot. Two male-line (Y-chromosome) results belong to haplogroup Q, a lineage widely associated with Indigenous peoples of the Americas. On the maternal side, mitochondrial haplogroups C (two individuals) and A2 (one individual) were observed — both are among the founding Native American maternal lineages detected across North, Central, and South America.

These genetic signatures are consistent with a pre-contact Indigenous ancestry for the La Union individuals and align with patterns recovered in other ancient Caribbean genomes. However, the sample count is very small (N = 3), so any population-level inference must be treated as preliminary. The predominance of Q on the Y-chromosome side and multiple maternal lineages can hint at continuity of founding Native American lineages in Hispaniola but cannot resolve fine-scale demographic processes such as migration episodes, sex-biased admixture, or local continuity versus replacement.

Genetic data illuminate aspects archaeology alone cannot: direct connections to continental founding populations, potential kin relationships, and glimpses of maternal versus paternal diversity. Yet, the limited number of samples and uneven preservation of genetic material mean that broader claims about the entire Ceramic-period population of La Union would be premature. Future sampling across sites and time slices is essential to test hypotheses suggested by these early findings.