West Liao River Mid‑Neolithic Echoes

The China_WLR_MN group, sampled at Banla Mountain near Chaoyang city in Liaoning, sits within the Middle Neolithic phase of the West Liao River valley (c. 3550–3050 BCE). Archaeological data indicates a landscape of river terraces and loess that supported expanding wetland hunting, fishing and early dryland cultivation. Material culture shows tempered pottery with corded and incised decoration, small ground stone tools, and site patterns that echo other West Liao River communities.

These communities likely emerged from earlier Neolithic populations in northeastern China, adapting to seasonal resources and intensifying millet cultivation across the river basin. Limited evidence suggests interactions—trade or shared ritual vocabulary—with contemporaneous lowland and upland neighbors rather than sweeping population replacements. At Banla Mountain the stratigraphy and features imply repeated seasonal occupations; midden deposits and hearths preserve a tangible record of how people rooted themselves in a watery, wooded world.

Because only a handful of genetic samples are available, connecting material-cultural sequences to demographic events remains tentative. Archaeological contexts provide the scaffold; the genetic data offer the first, still-fragile threads tying these sites to broader East Asian prehistoric lineages.

Genetic sampling from Banla Mountain currently comprises three individuals dated between 3550 and 3050 BCE. Uniparental markers show one individual carrying Y‑DNA haplogroup O2a and two individuals carrying mitochondrial haplogroup D. Haplogroup O2a is widespread in modern East and Southeast Asia and is often associated with Neolithic agricultural expansions in East Asia; haplogroup D is a common maternal lineage in northern and northeastern Asian populations.

These findings tentatively suggest continuity of East Asian paternal and maternal lineages in the West Liao River area during the Middle Neolithic. However, with only three samples the picture is fragmentary: patterns of sex-biased migration, local continuity, or admixture with neighboring groups cannot be robustly resolved. Autosomal genome-wide data would be required to test hypotheses about population structure, gene flow, and relationships to later Bronze Age groups.

In sum, the genetic evidence complements archaeological indications of a region rooted in local Neolithic traditions, but its limited sample size (<10) mandates caution—these are early genetic glimpses, not definitive population histories.