Overview
J2a-Y9284 is a structured downstream branch under J2a-M67 with a demographic core in eastern Anatolia, northern Mesopotamia and the Armenian highlands. Its formation corresponds to the middle Holocene period when upland agro pastoral communities were expanding across the Upper Tigris region and the southern Caucasus foothills. Archaeological correlations include early Chalcolithic fortified hilltop settlements and obsidian associated exchange networks that connected highland and lowland populations. During the Bronze Age, Y9284 bearing groups appear to have participated in the demographic currents associated with the Kura Araxes expansion and later Middle Bronze Age trade systems linking Armenia, northern Mesopotamia and eastern Anatolia. The clade diversified primarily in high altitude or foothill zones, reflecting settlement continuity in environmentally stable upland areas. Although never widespread, its presence across multiple adjacent regions indicates long term demographic persistence.