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Portrait reconstruction of I1748
Ancient Individual

A man buried in Argentina in the Ancient South America era

I1748
5460 BCE - 5000 BCE
Male
Arroyo Seco 2 Site 7200 Years Ago
Argentina
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Chapter I

Identity

The biological and cultural markers that define this ancient individual

Sample ID

I1748

Date Range

5460 BCE - 5000 BCE

Biological Sex

Male

mtDNA Haplogroup

C1c

Y-DNA Haplogroup

P-M45

Cultural Period

Arroyo Seco 2 Site 7200 Years Ago

Chapter II

Place

Where this individual was discovered

Country Argentina
Locality Arroyo Seco II
Chapter III

Time

When this individual lived in the broader context of human history

I1748 5460 BCE - 5000 BCE
Chapter IV

Story

The narrative of this ancient life

The Arroyo Seco 2 site, located in present-day Argentina, is an important archaeological site that provides significant insights into the prehistoric populations that inhabited the Pampas region approximately 7200 years ago. This era represents a transitional period in the prehistoric timeline of South America, where hunter-gatherer societies were adapting to changing ecological conditions. Here is a detailed description of the cultural and environmental context associated with the Arroyo Seco 2 site during this time:

Environmental Context

  • Geography: Arroyo Seco 2 is situated in the Pampas, a region characterized by fertile plains and a temperate climate. This environment would have supported a variety of flora and fauna, making it an attractive locale for mobile hunter-gatherer groups.
  • Climate: Around 7200 years ago, the region was experiencing environmental changes linked to broader climatic shifts after the Last Glacial Maximum. These changes resulted in some fluctuations in temperature and rainfall patterns, affecting the availability of natural resources.

Cultural Aspects

  • Subsistence Strategies: The people of Arroyo Seco 2 primarily subsisted through hunting and gathering. The archaeological record indicates a diet that included large terrestrial mammals, fish, birds, and plant resources. The remains of extinct megafauna suggest some overlap between late Pleistocene and Holocene faunal assemblages, showing adaptation to available game.
  • Tools and Technology: Stone tools dominate the artifact assemblage, reflecting the lithic technology prevalent during the period. These include bifacial points, scrapers, and other implements indicative of hunting and processing activities. The craftsmanship of these tools shows a high degree of skill and adaptation to local resources.
  • Settlement Patterns: The site likely served as a seasonal encampment, part of a broader network of sites used by mobile groups. Evidence suggests temporary structures that were used for shelter and community activities.
  • Social Organization: While the social structures of these groups remain speculative, it is probable that they were organized into small, kin-based groups with fluid leadership structures. Social interactions would have been characterized by cooperation for hunting, gathering, and tool-making.

Archaeological Significance

  • Burials and Rituals: The Arroyo Seco 2 site has yielded burial remains which provide insights into the spiritual and cultural practices of the inhabitants. These findings help us understand aspects of their belief systems, particularly funerary practices, and the treatment of the deceased.
  • Comparative Analysis: Studies of Arroyo Seco 2 offer a broader understanding of the adaptations and cultural practices of prehistoric hunter-gatherers in South America. When compared with other contemporary sites in the region, the variability in material culture provides clues about regional interactions and exchanges.

Challenges and Considerations

  • Preservation: The site's preservation conditions pose challenges to archaeological interpretation. Erosion, bioturbation, and other post-depositional processes can affect the integrity of the layers and the distribution of artifacts.
  • Interpretative Limits: While the evidence from Arroyo Seco 2 provides substantial information about past lifeways, the interpretation of data must consider the extensive time range and ecological changes. This context helps to avoid overgeneralization about cultural dynamics.

Conclusion

The Arroyo Seco 2 site is a pivotal archaeological locale for understanding the lifeways of hunter-gatherer societies in the Pampas region of Argentina around 7200 BP. The insights garnered from this site contribute to our broader understanding of prehistoric human adaptation, technology, and social organization during a time of significant environmental change. This period is marked by resilient and adaptive strategies that ensured the survival and continuity of these early South American cultures.

Chapter V

Context

Other ancient individuals connected to this sample

Sources

References

Scientific publications and genetic data

Scientific Publication

Reconstructing the Deep Population History of Central and South America

Authors Posth C, Nakatsuka N, Lazaridis I
Abstract

We report genome-wide ancient DNA from 49 individuals forming four parallel time transects in Belize, Brazil, the Central Andes, and the Southern Cone, each dating to at least ∼9,000 years ago. The common ancestral population radiated rapidly from just one of the two early branches that contributed to Native Americans today. We document two previously unappreciated streams of gene flow between North and South America. One affected the Central Andes by ∼4,200 years ago, while the other explains an affinity between the oldest North American genome associated with the Clovis culture and the oldest Central and South Americans from Chile, Brazil, and Belize. However, this was not the primary source for later South Americans, as the other ancient individuals derive from lineages without specific affinity to the Clovis-associated genome, suggesting a population replacement that began at least 9,000 years ago and was followed by substantial population continuity in multiple regions.

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