Southern and southeastern boundaries: A geometric morphometric analysis of bifacial points from Minas Gerais, São Paulo, Paraná, and Rio Grande do Sul (Brazil) [Fronteiras sul e sudeste: Uma análise morfométrica de pontas bifaciais de Minas Gerais, São Paulo, Paraná e Rio Grande do Sul (Brasil)]

Estilo e função em artefatos arqueológicos ou etnográficos têm sido estudados por uma miríade de pesquisadores através das mais diversas abordagens teóricas. Nesse contexto, o estudo de pontas de projétil tem sido particularmente útil para gerar um maior conhecimento acerca desses artefatos como marcadores de identidade, refletindo potenciais fronteiras entre grupos. Este trabalho visa explorar as diferenças na morfologia de pontas bifaciais holocênicas oriundas de Minas Gerais, São Paulo, Paraná e Rio Grande do Sul à luz dos conceitos de estilo e função da Arqueologia Evolutiva. Foram analisadas 248 pontas através de morfometria geométrica em duas dimensões. Embora nossa análise envolva dados de morfometria geométrica da ponta completa, a forma dos pedúnculos foi considerada como sendo de particular importância. De acordo com as expectativas teóricas e os modelos heurísticos de estilo e função propostos por Dunnell (1978a), a especificidade na forma dos pedúnculos das pontas pode ser considerada um recurso estilístico cujo aspecto e replicação diferencial entre grupos se deu, muito provavelmente, por processos estocásticos. Assim, nossa expectativa teórica é que a forma dos pedúnculos reflita escolhas dos grupos e, em última instância, seja um reflexo de possíveis fronteiras culturais pré-históricas. Nossos resultados apontam para a presença de diferenças importantes no tamanho e forma geral das pontas de Minas Gerais, São Paulo e Paraná em relação às pontas do Rio Grande do Sul. Tais diferenças podem ser observadas também na morfologia dos pedúnculos, mostrando a utilidade da aplicação da dicotomia heurística entre estilo e função (sensu Dunnell 1978a) para melhor entender a presença de potenciais fronteiras culturais pretéritas.Style and function in archaeological or ethnographic artifacts have been studied by a myriad of researchers through the most diverse theoretical approaches. In this context, the study of projectile points has been particularly useful in generating a greater knowledge of these artifacts as markers of identity, reflecting potential boundaries between groups. This work aims at exploring the differences in the morphology of Holocene bifacial points from Minas Gerais, São Paulo, Paraná and Rio Grande do Sul in light of the concepts of style and function set out by evolutionary archaeology. In this study, 248 points were analyzed by two dimensional geometric morphometrics. Although the analysis involves geometric morphometrics data of the complete point, the shape of the stem was considered to be of particular importance. According to the theoretical expectations and the heuristic models of style and function proposed by Dunnell (1978a), differences in the shape of the stem of the points can be considered a stylistic resource whose aspect and differential replication among groups was most likely due to stochastic processes. Thus, the theoretical expectation in this study is that the shape of the stem reflects the choices of the groups and, ultimately, is a reflection of potential ancient cultural boundaries. The results point to the presence of important differences in the size and general shape of the points from Minas Gerais, São Paulo, and Paraná in relation to the points from Rio Grande do Sul. These differences can also be observed in the stem morphology, showing the benefit of the application of the heuristic dichotomy between style and function (sensu Dunnell 1978a) to better understand the presence of potential past cultural boundaries

The Southern Divide: Testing morphological differences among bifacial points from southern and southeastern Brazil using geometric morphometrics

Bifacial points have been used to characterize the “Umbu” tradition in southern and southeastern Brazil. This archaeological tradition has been related to sites dated from the late Pleistocene-early Holocene boundary to near historical times. Such a huge temporal range and vast territory have suggested the existence of greater diversity within this tradition that has been ignored thus far due to the lack of systematic regional studies of such points. Through geometric morphometric analysis, this article aims to test the hypothesis that there are substantial differences in the Holocene bifacial points associated with the Umbu tradition in southeastern Brazil. Five landmarks were digitized in standardized photographs from 658 points from the states of São Paulo, Paraná, Santa Catarina, and Rio Grande do Sul. The results show that points made by groups from southeastern Brazil (São Paulo state) present a very distinct morphology (size and shape) in comparison to  those made by the southern groups (Paraná, Santa Catarina and Rio Grande do Sul). This would indicate a regional identity shared only by some groups from São Paulo (at least regarding the projectile points). It is possible that Umbu tradition presents a more restricted range, both in chronological and spatial terms, than the one proposed so far

Human occupation and paleoenvironments in South America: expanding the notion of an “Archaic Gap”

Uma revisão das informações arqueológicas produzidas no Brasil e países vizinhos durante as últimas décadas, aliada a uma análise de estudos paleoambientais recentes, sugerem que durante o Holoceno Médio amplas áreas da América do Sul deixaram de ser ocupadas por grupos humanos. Dados independentes, como datações de esqueletos humanos, estratigrafia de abrigos rochosos e cronologia de sítios arqueológicos a céu aberto convergem para a idéia de que tais áreas foram, no mínimo, fortemente depopuladas. Dados paleoambientais sugerem que eventos de seca constituíram a principal causa por trás das tendências observadas. Nossas conclusões expandem a noção já existente de que estresses climáticos têm um papel importante na conformação de assentamentos humanos em ambientes marginais, como desertos e altitudes elevadas, mostrando que o mesmo pode ocorrer nas terras baixas tropicais e subtropicais.An overview of the archaeological data produced in the last decades for Brazil and neighbouring countries, coupled with a background of recent studies on paleoenvironments, suggests that during the mid-Holocene vast areas of South America ceased to be occupied by human groups. Independent data coming from dated human skeletons, rockshelter stratigraphy, and chronology of open-air sites converge to the idea that these areas were, at least, strongly depopulated. Paleoenvironmental data suggest that dryness events constitute the major cause behind the observed trends. Our conclusions expand the already perceived notion that climatic stresses had a major role in the shaping of human settlement patterns in marginal environments, such as deserts and high-altitude settings, showing that the same can occur in tropical and subtropical lowlands

Gestão, pesquisa e valorização do sítio arqueológico Grotta Dei Santi (Toscana - Itália)

Grotta dei Santi-GDS é um sítio préhistórico do Paleolítico Médio, situado na região da Toscana (Itália Central). Apresenta vestígios da ocupação neandertalense entre 50.000 e 40.000 anos antes do presente. Por sua importância no panorama paleolítico italiano, o Dipartimento di Scienze Fisiche della Terra e dell'Ambiente-Unità di Ricerca di Preistoria e Antropologia dell'Università di Siena (Itália), há mais de dez anos, conduz as pesquisas, escavações e ações de valorização patrimonial com a finalidade de aprofundar o conhecimento sobre o comportamento neandertal na região e também valorizar um sítio que, por sua própria importância científica e localização, se apresenta como único em seu gênero. Neste capítulo, apresentamos o projeto desenvolvido no sítio GDS com foco numa gestão integrada do território

The Oldest Case of Decapitation in the New World (Lapa do Santo, East-Central Brazil)

We present here evidence for an early Holocene case of decapitation in the New World (Burial 26), found in the rock shelter of Lapa do Santo in 2007. Lapa do Santo is an archaeological site located in the Lagoa Santa karst in east-central Brazil with evidence of human occupation dating as far back as 11.7-12.7 cal kyBP (95.4% interval). An ultra-filtered AMS age determination on a fragment of the sphenoid provided an age range of 9.1-9.4 cal kyBP (95.4% interval) for Burial 26. The interment was composed of an articulated cranium, mandible and first six cervical vertebrae. Cut marks with a v-shaped profile were observed in the mandible and sixth cervical vertebra. The right hand was amputated and laid over the left side of the face with distal phalanges pointing to the chin and the left hand was amputated and laid over the right side of the face with distal phalanges pointing to the forehead. Strontium analysis comparing Burial 26's isotopic signature to other specimens from Lapa do Santo suggests this was a local member of the group. Therefore, we suggest a ritualized decapitation instead of trophy-taking, testifying for the sophistication of mortuary rituals among hunter-gatherers in the Americas during the early Archaic period. In the apparent absence of wealth goods or elaborated architecture, Lapa do Santo's inhabitants seemed to use the human body to express their cosmological principles regarding death

Rock Art at the Pleistocene/Holocene Boundary in Eastern South America

Background: Most investigations regarding the First Americans have primarily focused on four themes: when the New World was settled by humans; where they came from; how many migrations or colonization pulses from elsewhere were involved in the process; and what kinds of subsistence patterns and material culture they developed during the first millennia of colonization. Little is known, however, about the symbolic world of the first humans who settled the New World, because artistic manifestations either as rock-art, ornaments, and portable art objects dated to the Pleistocene/ Holocene transition are exceedingly rare in the Americas. Methodology/Principal Findings: Here we report a pecked anthropomorphic figure engraved in the bedrock of Lapa do Santo, an archaeological site located in Central Brazil. The horizontal projection of the radiocarbon ages obtained at the north profile suggests a minimum age of 9,370640 BP, (cal BP 10,700 to 10,500) for the petroglyph that is further supported by optically stimulated luminescence (OSL) dates from sediment in the same stratigraphic unit, located between two ages from 11.760.8 ka BP to 9.960.7 ka BP. Conclusions: These data allow us to suggest that the anthropomorphic figure is the oldest reliably dated figurative petroglyph ever found in the New World, indicating that cultural variability during the Pleistocene/Holocene boundary i

Schematic positioning of the petroglyph.

<p>The draw is showing the relative projection of the figure (petroglyph), radiocarbon and luminescence ages.</p

Aspect of the petroglyph.

<p>Photograph (A) and contour (B).</p