Grotta La Sassa: Echoes of Copper-Age Lazio

Grotta La Sassa sits in a limestone hollow above the coastal plains of southern Lazio, where human footsteps echoed through a long sequence of use during the Copper Age. Archaeological data indicates episodic occupation and funerary activity during the late 3rd millennium BCE, tied to the regional La Sassa cultural horizon. Radiocarbon dates associated with the recovered human remains range from 2868 to 2488 BCE, placing these individuals in the waning centuries of the Copper Age when small-scale communities exploited both inland uplands and nearby coastal resources.

Material culture in the La Sassa tradition—pottery forms, flint tools, and localized burial practices—suggests people living in networks of valleys and coastal plains rather than large urban centers. Limited evidence implies interaction with neighboring cultural spheres across the central Mediterranean, where mobility along rivers and coastal routes could carry ideas and genes. The three genomic samples come from a restricted assemblage and thus offer a narrow window: they illuminate presence and possible affinities but cannot define the population as a whole.

Viewed with measured expectancy, Grotta La Sassa’s people emerge as local actors within a broader tapestry of Late Neolithic and Copper-Age transformations in Italy—communities shaped by long-standing Neolithic ancestry, regional innovations, and episodic long-distance connections.

Three genomic samples from Grotta La Sassa provide a slender but revealing glimpse of the people who occupied this cave. Two males carry Y-chromosome haplogroup J, a lineage today and historically frequent across the Near East and parts of the Mediterranean; one individual carries mtDNA haplogroup J and two carry H. These mitochondrial types are widespread in Europe from the Neolithic onward—H is especially common in later prehistoric and modern Europeans, while J is often associated with Neolithic dispersals and Near Eastern connections.

Because only three individuals were sampled, conclusions must be cautious. The prevalence of Y‑J in this tiny set may reflect local paternal continuity, recent male-mediated connections with Mediterranean or Anatolian networks, or simply sampling bias. Notably, these samples do not show dominance of some Steppe-associated Y lineages that appear elsewhere in Europe after the 3rd millennium BCE, but the absence in three genomes is not evidence of absence in the broader population.

Genomic data from La Sassa align with a broader picture in which central Italian Copper Age groups often carry a mosaic of ancestries: persistent Neolithic farmer heritage, local hunter‑gatherer contributions, and episodic gene flow from Mediterranean and eastern sources. Future sampling (many more than the current three individuals) is required to test hypotheses about sex-biased migration, population continuity, and regional contact.