• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 64
  • 59
  • 56
  • 9
  • 9
  • 6
  • 4
  • 2
  • 2
  • 1
  • 1
  • Tagged with
  • 242
  • 100
  • 88
  • 62
  • 59
  • 43
  • 41
  • 35
  • 31
  • 29
  • 28
  • 25
  • 25
  • 25
  • 24
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
201

A indústria lítica do sambaqui Mar Casado, litoral do estado de São Paulo / The lithic industry of the Mar Casado shell mound, costal of the São Paulo State

Daniela Maria Alves 14 February 2011 (has links)
A pesquisa aqui apresentada trata do estudo da cultura material lítica do sambaqui Mar Casado. Este sambaqui situava-se na cidade de Guarujá, estado de São Paulo. O sambaqui Mar Casado foi pesquisado entre os anos de 1961 e 1962 e juntamente com outros sítios litorâneos paulistas, pesquisados no mesmo período, faz parte da história da Arqueologia brasileira. Este trabalho desenvolveu-se de modo a melhor compreender as pesquisas empreendidas em um contexto arqueológico diferente do vivido atualmente, além de revalorizar antigos acervos conservados no museu. A cultura material lítica encontrada nos sambaquis brasileiros é bastante diversificada e apresenta suas especificidades. Os artefatos brutos e polidos, particularmente, receberam pouca atenção no decorrer da pesquisa arqueológica. Este estudo pretendeu analisar os artefatos líticos por meio da abordagem tecnológica, buscando observar as marcas de uso deixadas nos artefatos. A análise demonstrou que a população de Mar Casado encontrou um modo eficaz de administrar o uso de seus objetos líticos: usando várias superfícies do mesmo artefato para diversos fins. Isto significa dizer que esses artefatos tinham como característica a multifuncionalidade. Os sambaquieiros de Mar Casado provavelmente fizeram uso desses artefatos para processar vegetais, grãos, sementes e outros alimentos, além de usá-los para triturar pigmentos ou ainda como abrasivos em materiais como osso, madeira, concha. / The research presented here deals with the study of lithic material culture of the shell mound Mar Casado. This shell mound was located in the city of Guarujá, São Paulo. The shell mound was searched between the years 1961 to 1962 and along with other coastal sites in São Paulo surveyed in the same period, part of the history of Brazilian Archaeology. This work was developed in order to better understand the archaeological research undertaken in a context different from that experienced today, and upgrade old preserved in museum collections. The lithic material culture found in shell mounds in Brazil is very diverse and has its specificities. The rough and polished artifacts, particularly, have received little attention in the course of archaeological research. This study sought to examine the lithic artifacts through technological approach, seeking to observe the use-wear of artifacts. The analysis showed that the population of Mar Casado found an effective way to manage the use of their lithic objects, using various surfaces of the same artifact for various purposes. This means that these artifacts had the characteristic of multifunctionality. The population of Mar Casado probably did use these artifacts to process vegetables, grains, seeds and other foods, and use them for grinding pigments or abrasive materials such as bone, wood, shell.
202

Entre as pedras: as ocupações pré-históricas recentes e os grafismos rupestres da região de Diamantina, Minas Gerais / Among the rocks: the later prehistoric human occupations and the rock art of Diamantina, Minas Gerais

Andrei Isnardis Horta 04 March 2009 (has links)
A região de Diamantina, em Minas Gerais, guarda um amplo acervo de grafismos rupestres e ricos conjuntos artefatuais e estruturas atribuíveis aos últimos 1.500 anos de ocupação humana. Esta pesquisa investiga os dois conjuntos de registros arqueológicos: o horizonte recente e as pinturas rupestres. Numa análise que procura congregar estudos intra e intersítios, os dois conjuntos são explorados, em busca de identificar sistemas de ocupação e construção da paisagem. Nas ocupações recentes, vêem-se coleções líticas bastante variadas, em sítios de atributos diferentes, que se pretende conectar por meio do emprego das noções de organização tecnológica e cadeia operatória. No que tange aos grafismos rupestres, esta pesquisa investe na identificação de estilos e no reconhecimento das relações cronológicas entre esses. São analisadas também as formas de interação diacrônica entre figuras e as formas de sua composição gráfica. / The region of Diamantina, in Minas Gerais, has a large rock paintings assemblage and rich artefactual assemblages, and structures from the last 1.500 years of human occupation. This research explores the both archaeological features: the occupations of the later pre-colonial period and the rock art. Trying to put together intra and inter-site studies, we intent to identify systems of landscape building. In the later human occupation, there are many lithic artifacts, in different kinds of sites, that are studied here with the use of two basic concepts: technological organization and chaine operatoir. The rock art is explored through stylistic and chronological approaches. We also explore the ways of diachronical interactions and graphic construction among the paintings.
203

Cognição e cultura no mundo material: os Itaparicas, os Umbus e os \"Lagoassantenses\" / Cognition and culture in the material world: the Itaparicas, the Umbus and the \"Lagoassantenses\"

João Carlos Moreno de Sousa 09 May 2014 (has links)
A partir de uma abordagem que considera as ciências cognitivas como um caminho eficaz para buscar compreender o homem e a cultura através de vestígios materiais, a presente pesquisa teve como objetivo central entender os processos cognitivos da relação \"homem x paisagem\", de grupos que ocuparam o Brasil durante o Holoceno Inicial, através da análise de algumas indústrias líticas. O método de análise proposto não privilegia apenas os artefatos formais destas indústrias, mas todos os vestígios líticos provenientes da vida de um artefato. As indústrias líticas em questão tratam-se das indústrias classificadas pelo Programa Nacional de Pesquisas Arqueológicas (PRONAPA), nas décadas de 1960 e 1970, como pertencentes às culturas arqueológicas \"Tradição Itaparica\" e \"Tradição Umbu\", e uma indústria proveniente da região de Lagoa-Santa, Minas Gerais. Esta análise proporcionará dados que posteriormente servirão como base para compreender as razões da distinção entre estas indústrias que surgiram no Brasil entre 12.000 - 9.000 AP, além de contribuir na construção de modelos de construção de conhecimento humano em diferentes sociedades pré-históricas. / From an approach that considers the cognitive sciences as an effective way to try to understand man and culture through material remains, this research project has as main objective to understand the cognitive processes of the \"human x environment\" relationship, from groups that occupied the Brazilian territory during the Initial Holocene, trough the analysis of some lithic industries. The proposed analysis method focuses not only the formal artifacts of these industries, but all traces of life from the lithic artifact. The referenced lithic industries are the industries classified by the National Program of Archaeological Research (PRONAPA) in the 1960s and 1970s, as belonging to the archaeological cultures \"Tradition Itaparica\" and \" Tradition Umbu\", and also an industry from the region of Lagoa Santa, Minas Gerais. This analysis will provide data that allows having a basis for understanding the reasons for the distinction between those industries that emerged in Brazil between 12,000 BP and 9,000 BP, and contribute in the formulation of building human knowledge models in different prehistoric societies.
204

Les industries lithiques pré-européennes de Polynésie centrale : savoir-faire et dynamiques techno-économiques / Lithic industries of Central Polynesia : know-how and techno-economic dynamics

Hermann, Aymeric 12 December 2013 (has links)
En raison de leur ubiquité dans les assemblages archéologiques et les collections ethnographiques, les lames d’herminette en pierre ont longtemps été utilisées comme « fossiles-directeurs » afin de mettre en évidence des corrélations typo-chronologiques en Océanie. Néanmoins, les critères d’observations formels utilisés dans cette approche typologique ne permettaient pas de rendre compte de la complexité des processus techniques de fabrication. Après avoir rappelé les autres études expérimentales réalisées précédemment dans la région, nous proposons un premier référentiel des stigmates de taille sur roches basaltiques qui nous permet d’identifier différentes techniques de percussion utilisées dans la confection des lames d’herminette en pierre. La restitution des activités techniques qui ont abouti à la production de ces outils a été réalisée à travers l’analyse technologique d’assemblages archéologiques (produits finis ou semi-finis et déchets de taille) récoltés dans différentes sites de la côte Nord de l’île de Tubuai (Archipel des Australes, Polynésie Française). La caractérisation géochimique des gîtes géologiques et des artefacts taillés découverts en contexte archéologique a permis de restituer la répartition spatiale des différentes séquences de production au sein d’une même communauté ainsi que les transferts d’objets produits dans d’autres archipels. Parmi les différents réseaux d’approvisionnement identifiés dans l’île, j’ai choisi de suivre les activités techniques présentes au sein de deux sites : le premier est un complexe spécialisé dans la production des outils en pierre associant carrière d’extraction et ateliers de transformation, et l’autre un site d’habitat côtier.A travers la restitution des dynamiques de production, d’entretien et d’échange des lames d’herminettes en pierre, nous proposons un nouveau regard sur l’économie traditionnelle des chefferies de Polynésie centrale. Dans les assemblages étudiés, la confection de lames d’herminette a été essentiellement réalisée à travers la production d’éclats utilisés comme supports et transformés par façonnage. Cette combinaison des processus de débitage et de façonnage semble correspondre à une tradition technique qui prend son origine en Polynésie occidentale et qui est identifiée dans tous les archipels de Polynésie orientale. A partir des collections étudiées à Tubuai, il est possible de distinguer une production très standardisée de grandes lames au sein des ateliers spécialisés, et une production très peu standardisée de petites lames au sein des habitats côtiers. Grâce à la restitution des processus de production existant au sein d’une même communauté et des échanges intercommunautaires effectués à longue distance, nous discutons le rôle économique des herminettes à lame de pierre dans les chefferies polynésiennes. / The ubiquity of stone adze blades in archaeological sites and museum collections resulted in their use as “cultural fossils” to draw cultural evolutionary changes in the Polynesian islands. The typological approach proves useful for understanding the archaeological diversity in Oceania. Yet, it lacks efficiency when it comes to shedding light on the technical and economic choices involved in the production processes.After a discussion of previous knapping experimentations performed in Polynesia, I propose a panel of diagnostic criteria for identifying the use of hard and soft hammerstone in the manufacture of adze blades. Then, I focus on the production of blades from assemblages collected on the North coast of Tubuai Island (Austral Archipelago, French Polynesia). Along with the need to consider the whole manufacturing process and the post-production exchange networks comes the necessity to connect different archaeological assemblages. Geochemical characterisation of the geological sources and artefacts discovered within archaeological contexts were used to settle the favoured framework for understanding the series of production sequences and for identifying the transfer of tools produced within and outside the island. Among the different supply networks identified on the island, I chose to investigate the operational sequences located within two sites: a quarry complex involving several workshops and a coastal dwelling site.Through the investigation of manufacture, maintenance and exchange processes regarding stone adze blades, I propose a new insight on the economic system in the chiefdoms of central Polynesia. The technical tradition documented on Tubuai is related to the production and transformation of flakes used as blanks for adze blades manufacture. This association of flaking and shaping processes originated in Western Polynesia but was also spread over Eastern Polynesia. The size and the form of these adzes were directly linked to one’s capacity for producing standard-sized blanks and for shaping specific blades forms. Based on the Tubuai collections, I identified a highly standardised production related to specialist knappers’ workshops, as well as a production of heterogeneous forms of small adze blades within a non-specialised dwelling context. Thanks to the analysis of the production processes within the community and the long-distance intercommunity exchanges, I finally discuss the economic role of stone adzes in ancient Polynesian chiefdoms.
205

Originalité et développement du Paléolithique inférieur à l'extrémité occidentale de l'Eurasie : le Colombanien de Menez-Dregan (Plouhinec, Finistère) / Originality and development of the Lower Palaeolithic at the westernmost tip of Eurasia : the “Colombanian” of Menez-Dregan (Plouhinec, Finistère)

Ravon, Anne-Lyse 04 July 2017 (has links)
La variabilité des assemblages du Paléolithique inférieur dans l'ouest de l'Europe nourrit les débats actuels quant à leur relation avec les flux de populations, dans le contexte des changements environnementaux et paléogéographiques. Le faciès technique du Colombanien, localisé sur la façade atlantique bretonne, illustre cette variabilité. Selon la littérature, il diffère de l'Acheuléen, dominant dans les régions voisines, notamment par l'absence de bifaces. L'industrie du site de Menez-Dregan I (Plouhinec, Finistère) en constitue l'exemple dont le contexte géologique et paléoclimatique est le mieux documenté. Ce site a livré des traces de foyer qui sont parmi les plus anciennes d'Europe, ainsi qu'un abondant matériel, qui, dans les niveaux supérieurs, offre les prémices de la transition du Paléolithique inférieur vers le Paléolithique moyen. L'analyse des caractères techniques et typologiques des assemblages lithiques issus des couches 9 à 4 permettra de retracer l'évolution des stratégies d'approvisionnement et des comportements techniques et de replacer ce site dans le contexte régional et européen. La contemporanéité d’assemblages sans pièces bifaciales et à pièces bifaciales est attestée en Europe dès 700 ka. Si la plupart des sites européens présentent des assemblages à pièces bifaciales, les gisements à niveaux sans bifaces sont également assez nombreux. L’interstratification des niveaux à et sans pièces bifaciales sur certains sites est parfois interprétée comme le témoignage d’occupations liées à des activités spécialisées différentes, des matières premières différentes, ou des groupes humains aux traditions culturelles ou techniques différentes. De récentes publications de synthèse font état de la question : l’hypothèse de la coexistence de groupes humains aux traditions techniques différentes y est discutée, sur la base de modalités de débitage communes et d’utilisations similaires des territoires. Ainsi, seule la présence ou l’absence de bifaces tend à différencier ces occupations. Le travail engagé ici s’inscrit dans la lignée des études antérieures, mais a été entrepris dans le but de définir les systèmes techniques mis en œuvre au Paléolithique ancien dans l’ouest armoricain. Il permet ainsi de présenter des données nouvelles afin de caractériser les industries lithiques des sites dits « colombaniens ». Il ressort de notre étude que si le contexte paléogéographique et géologique ainsi que le type de gisement explique une certaine variabilité dans la composition des assemblages, cela n’explique pas les traditions techniques, et notamment la présence ou l’absence de pièces bifaciales ou de large cutting tools (LCTs). Si le type d’activité peut alors être mis en cause pour expliquer cette variabilité, une fréquentation répétée sur un même site, dans un contexte paléoenvironnemental globalement similaire, comme c’est le cas à Menez Dregan I indiquerait une visite régulière de groupes humains aux traditions techniques différentes, comme cela est aussi le cas sur d’autres gisements. Nous aboutissons ainsi à une révision du faciès Colombanien, qui s’avère être une variante régionale de l’Acheuléen. Ces résultats confrontés aux données paléoclimatiques et paléogéographiques contribuent à mieux comprendre la dynamique de peuplement de ce Finistère eurasiatique au Pléistocène moyen. / The variability in the Palaeolithic assemblages of western Europe feeds current debates about their relationship with population flows in a context of environmental and palaeogeographic changes. The technical Colombanian facies, located in the South Atlantic coast of Brittany, illustrates this variability. This facies differs from the Acheulean that is dominant in neighboring regions, especially in its lack of bifaces. The industry at the site of Menez-Dregan is an example where the geological and paleoclimatic context is the best documented in the region. Specifically, this site has yielded evidence of fireplaces that are among the oldest in Europe, and an abundance of lithic material, which, in the upper levels, evidences the beginning of the transition from the Lower Palaeolithic to the Middle Paleolithic. As for the analysis, the technical, typological and morpho-functional features of the lithic assemblages from layers 9 to 4 will trace the development of procurement strategies, techniques and behaviors to put this site into a regional and European context. The contemporaneity of assemblages with bifacial pieces and without bifacial pieces is attested in Europe from 700 ky. While most of the European sites display assemblages with handaxes, deposits without any bifacial components are quite numerous as well. On some sites, the interstratification of levels with bifacial pieces and without bifacial pieces is sometimes interpreted as a testimony of either specialized activities, different raw materials, or human groups with different cultural or technical traditions. Recent publications state the question: the hypothesis of a coexistence of human groups with different technical traditions is discussed, on the basis of similar modalities of debitage and similar use of landscape. Therefore, only the presence or absence of handaxes is left to differenciate these occupations. The work realised here joins in the lineage of the previous studies, but was undertaken with the aim of defining the technical systems operating during the Lower Palaeolithic in the western Armorican Massif. Therefore, it enables the presentation of new data in order to characterize the “Colombanian” lithic industries. It emerges from this study that if the palaeogeographical and geological context as well as the type of deposit explain a certain variability in the composition of the assemblages, it does not explain the technical traditions, especially the presence or absence of handaxes or large cutting tools. If the variability cannot be explained by activity alone then the repeated visits to a single site, given a globally similar palaeoenvironmental context as evidenced at Menez-Dregan I, likely indicates a regular occupancy by human groups with differing technical traditions. Therefore, we end up in a revision of the Colombanian facies, which turns out to be a regional variant of the European Acheulean. These results, when compared to paleoclimatic and palaeogeographic data, help develop a better understanding of the settlement dynamics of this region during Middle Pleistocene.
206

Variabilité des comportements techniques du Dryas ancien à la fin du Bølling : Analyse techno-économique comparée du matériel lithique de cinq gisements tardiglaciaires du Jura méridional

Bereiziat, Gérald 20 December 2011 (has links)
Ce travail a pour objectif de préciser, à travers la composante lithique de cinq gisements, le cadre chrono-culturel des dernières populations de chasseurs-cueilleurs venues occuper le Jura méridional au sortir de la dernière grande glaciation. Normalisée par une réflexion engagée sur le degré de préservation des ensembles archéologiques, l’étude du matériel lithique, menée sous une double perspective technologique et économique, permet d’éclairer les comportements ayant orienté la conduite technique des individus et de discuter la structuration de ces groupes sur un axe synchronique et diachronique s’étendant du 15ème millénaire au 11ème millénaire avant le présent. Ces nouveaux acquis permettent ainsi de redéfinir la place des assemblages sur l’espace jurassien et de contrôler l’hypothèse d’une région carrefour soumise à de multiples influences. / The present thesis is aimed at defining more closely the chronocultural frame of late glacial populations on the basis of lithic artefacts from five sites in the Southern French Jura. Starting from a taphonomic analysis, a techno-economical approach illuminates the variability of individual technological behaviour and finally discusses the particular humain groups on a synchronic and diachronic axis from 15.000 untill 11.000 yr B.P. These new results permit to redefine the place of these assemblages in the context of the Jura mountains and thus to establish the Southern French Jura within the Rhine-Saone-Rhone area as a crossing point of multiple influences.
207

Les économies préhistoriques dans les domaines insulaires de la façade Manche / Atlantique de la France, de la fin du Mésolithique au début de l'âge du Bronze / The prehistoric economies on islands of Channel / Atlantic coasts of France, from the late Mesolithic to early Bronze Age

Audouard, Lorena 01 October 2014 (has links)
Le sujet de cette thèse est d’aborder le fonctionnement économique des premières sociétés agro-pastorales dans les domaines insulaires de la façade Manche/Atlantique de la France, de la fin du Mésolithique au début de l’âge du Bronze. Les ressources des îles, à la fois limitées (surface exploitable réduite, gestion cynégétique complexe) et diversifiées (ressources terrestres et maritimes) ont-elles entraîné une adaptation des modes de vie ? Les populations ont-elles subi leur environnement ou ont-elles dépassé les contraintes grâce à un dynamisme de contacts et d’échanges ? Ces questionnements sont abordés par le biais des informations fournies par l'industrie lithique de plusieurs sites insulaires, dont les modalités d'approvisionnements en matières premières et les caractéristiques sont systématiquement comparées aux données disponibles sur les proches sites continentaux. Cette approche permet de cerner l'existence ou l'absence de particularismes insulaires, puis de mesurer le degré d'insertion des populations îliennes au sein des réseaux d'échanges à plus ou moins longue distance de matières premières. La présence de matières premières exogènes (telles que le silex du Cinglais ou encore le silex du Turonien supérieur de la région du Grand-Pressigny) sur certaines îles révèle l'existence de contacts entre communautés continentales et insulaires, ces dernières apparaissant comme ouvertes aux influx extérieurs. L'ensemble de ces informations sont remises en perspective grâce aux données fournies par d'autres productions matérielles (le mobilier céramique notamment). Il est alors possible de percevoir les interactions qui se sont maintenues du Néolithique au début de l’âge du Bronze entre les habitants de la côte et les îliens, et de mettre en valeur des disparités entre les îles. / The subject of this thesis is to address the economic operation of the first agro-pastoral societies on the islands from the Channel / Atlantic coasts of France, from the late Mesolithic to the early Bronze Age. The resources of these islands, both limited (exploitable surface reduced, complex hunting gestion) and various (terrestrial and marine resources), have they resulted in an adaptation of lifestyles? Populations have they suffered their environment or have they exceeded the constraints through a dynamic of contacts and exchanges ? These questions are addressed through the information provided by the lithic industry of several island sites. The terms of supply of raw materials and characteristics of lithic industry are systematically compared with available data on nearby continental sites. The presence of exogenous materials (such as flint of "Cinglais" or the Turonian flint of the Greater Pressigny) on some islands reveals the existence of contacts between mainland and island communities, the latters appearing as open to impulses outside. This approach identifies the existence or absence of insular peculiarities, then measure the degree of integration of islands populations within trade networks of long distance raw materials. All these information are put into perspective with data provided by others materials (including ceramic artefacts). Then, it is possible to perceive the interactions that are held from the Neolithic to the beginning of the Bronze Age between the inhabitants of the coast and the islanders, and also highlight disparities between islands.
208

Kulturkontakter i Sydskandinavien under mesolitikum : Hantverkstraditioner, råmaterialval och mobilitet för 9000 år sedan, med utgångspunkt från Norje Sunnansund i Blekinge

Kjällquist, Mathilda January 2020 (has links)
The purpose of this thesis is to investigate different scales of mobility and social networks in Southern Scandinavia around 7000 BC. An essential basis for this work is the hypothesis that the conical core pressure blade technology, a specific method for producing lithic blades, reached Scandinavia from the east. The process has been discussed and verified in several earlier studies. The study is based on investigations of lithic material and bone tools, as well as human skeletal remains; a multidisciplinary strategy has been applied, which combines technological analyzes of archaeological material with isotope analyzes of human teeth. Materials and data have been collected from a total of 111 sites located mainly in Scandinavia, but also in Finland, the Baltic countries and Russia. The Mesolithic site Norje Sunnansund in Blekinge, southern Sweden is in focus. Analyzes of the chaîne opératoire of lithic and osseous production make it possible to study technological processes as the transmission of culturally conditioned patterns; these patterns underlie the formative principles of each technology complex. By identifying specific traditional knowledge built into the material process, it becomes possible to define prehistoric human traditions and thereby study human interactions and migrations between geographical regions. The analyzes of strontium isotopes in human teeth from Norje Sunnansund enables an additional individual provenancing since the isotopes reflect a geographical-geological variation. The study provides a higher resolution of the arrival and spreading of the pressure blade technology from the northeast. It also strengthens the picture of a Mesolithic society in Southern Scandinavia based on geographically extensive social networks. An increased regionalization and territorialization has previously been proposed for western Scandinavia around 8800-7500 BC. The study confirms that during this period the population seem to consist of several subgroups related to specific territories, but with close and regular contact within a more extensive social network. This fits well with the picture of a group that may have inhabited Norje Sunnansund for extended periods, while social contacts were maintained over longer distances.
209

Comment raconter des histoires lithiques dans les labours de La Martre (Québec, Canada)

Kolhatkar, Manek 06 1900 (has links)
Ce doctorat lie les vestiges lithiques fragmentés et dispersés par des décennies de labours des terrasses marines constituant le site de La Martre (Gaspésie, Québec, Canada), pour y dégager certaines limites d’intelligibilité et de perceptibilité, et en tracer de nouvelles. Les labours forment un palimpseste archéologique spécifique : ils ont créé un effet de décontextualisation des pratiques lithiques contenues dans les bords de chaque biface et éclat lorsque les contextes de déposition permettant de rapprocher certains vestiges et d’en éloigner d’autres, et permettant d’exercer un contrôle chronologique sur ces vestiges ont été perturbés. Les seuls repères chronologiques disponibles sont (i.) un plancher d’habitabilité suivant la déglaciation du versant nord de la Gaspésie ; (ii.) l’exondation de terrasses marines dues au retrait de la mer de Goldthwait ; (iii.) des pointes de projectile dites « Plano » ayant permis d’affilier dans des travaux antérieurs une partie de La Martre au « Paléoindien récent » (entre 11 600 à 8000 cal BP dans le Nord-est américain). Conséquemment, les repères chronologiques de La Martre flottent dans une marée lithique mouvante formée de bifaces et d’éclats dans les labours sans le contrôle permis par les contours que des contextes de déposition mieux préservés permettraient. Ce contrôle préalable est indispensable pour pouvoir délimiter les échelles justifiant l’utilisation de certaines théories et méthodes d’analyse. Il est considéré que ces problèmes contextuels ne justifient aucunement l’exclusion des labours d’une narration archéologique, à condition d’opérer un renversement de nos pratiques. Les labours permettent d’exacerber des problèmes théoriques, épistémologiques et méthodologiques, constitutifs de toute pratique archéologique et que des contextes non labourés rendent invisibles. Ces problèmes peuvent être ramenés à celui provoqué par la bifurcation du réel, un geste qui, en séparant l’esprit de la matière, sépare un réel en deux et maintient l’un attaché à ce qui en est déjà connu et en bloque le développement et la transformation. Les labours marquent une première étape d’émancipation de ce réel bifurqué en nous forçant à renverser notre rapport à lui pour partir d’un réel mouvant et dispersé dans lequel une conscience perçoit et pense. Raconter des histoires lithiques dans les labours de La Martre, c’est donc prolonger ce renversement initié par ces labours en suivant ses mouvements constitutifs : ceux d’une conscience, de la taille de la pierre, des labours et de nos descriptions. C’est développer de nouvelles histoires qu’un ancrage dans un réel bifurqué inhibe. Il est proposé ici que ce renversement soit prolongé par un mouvement descriptif par lequel quinze surfaces de dispersion sont progressivement tracées : (i.) des terrasses labourées, les stations 15 et 16 de La Martre ; (ii.) des supports transformés ; (iii.) des chaînes opératoires ; (iv.) un échantillon de 447 supports transformés ; (v.) un continuum de réduction ; (vi) l’intégrité d’un support ; (vii.) les compétences ; (viii.) la matière première ; (ix.) les objectifs de taille ; (x.) les groupes techniques ; (xi.) des flux lithiques ; (xii.) une combinatoire de compétences ; (xiii.) des évolutions possibles ; (xiv.) des lieux ; (xv.) des séquences de production. Ces surfaces permettent de diversifier la taille de la pierre plutôt que de l’épurer ; de changer les conditions dans lesquelles des outils méthodologiques tels que la chaîne opératoire ou les stades d’une séquence de réduction peuvent être utilisés ; de repartir de mouvements et de rapports constitutifs de La Martre plutôt que de groupes ou d’individus préalablement définis ; de différencier les terrasses marines pour circonscrire un lieu, 16-ouest, structuré par des dynamiques socioculturelles d’apprentissage et de distinction dont émergent diverses séquences de production capturant des compétences et des objectifs divers ; de reconnecter La Martre au paysage du Nord- est paléoindien pour en diversifier les histoires lithiques et archéologiques ; de travailler dans un entre-deux : entre deux lieux, entre deux paysages, entre deux formes émergeant de nos histoires sans que ces histoires ne s’y arrêtent. Raconter des histoires lithiques dans les labours de La Martre, c’est donc effectuer un quadruple travail narratif qui ailleurs n’aurait pas eu besoin d’être fait : (i.) explorer les façons dont les tailleurs et tailleuses de La Martre s’engageaient avec leur paysage en taillant la pierre ; (ii.) analyser les conditions permettant de raconter ces histoires anthropologiques ; (iii.) créer de nouvelles conditions permettant de raconter de nouvelles histoires ; et (iv.) raconter ces histoires lithiques. / This thesis binds various lithic remains fragmented and scattered by decades of plowing at La Martre (Gaspé Peninsula, Quebec, Canada). Plowing creates a specific type of archaeological palimpsest. It erases units allowing for: the comparison of lithic practices contained within each biface and flake that make up a context; the chronological control of said units; and using various methods and theories according to an archaeological unit’s appropriate scale. A maximum chronological boundary following the deglaciation of the northern Gaspé Peninsula, the exposure of La Martre’s higher terraces by the receding sea, and the production of Plano projectile points (dated to between 11 600 and 9000 cal BP in northeastern America) provide archaeologists with some chronological control that floats within La Martre’s hundreds of thousands of lithic remains. Yet, it is argued that plowing cannot preclude archaeologists from telling lithic and other stories, provided that some practices and habits are changed. Indeed, plowing points to theoretical, epistemological and methodological problems that elsewhere may have remained invisible. These problems pertain to the bifurcation of reality inhibiting its development by laying down a ready- made and unchanging reality prior to any engagement with it. Plowing requires for this specific engagement with reality to be turned upside down, starting from a moving and dispersed reality that a consciousness perceives and thinks with. Telling lithic stories at La Martre requires that this turn be extended by following its movements: that of a conscience, of knapping and of plowing; thus telling new stories that a bifurcated relationship to reality had inhibited. It is suggested here that this turn be extended using description along fifteen dispersion surfaces: (i.) two plowed terraces, stations 15 and 16; (ii.) shaped blanks; (iii.) chaînes opératoires; (iv.) a sample of 447 shaped blanks; (v.) a reduction continuum; (vi.) shaped blank integrity; (vii.) skill; (viii.) raw material; (ix.) knapping objectives; (x.) technical groups; (xi.) lithic fluxes; (xii.) skill combinatorics; (xiii.) possible evolutions; (xiv.) places; (xv.) production sequences. Such surfaces allow for several things: first, for knapping diversification rather than refining; second, for changing the condition of use of the chaîne opératoire or the reduction sequence; third, for starting from movement and relationships rather than defined groups or individuals; fourth, for differentiating La Martre’s plowed terraces; fifth, for delimiting a place, 16-West, structured by the sociocultural dynamics of learning and distinction; sixth, for growing several production sequences; seventh, for reconnecting La Martre to the northeastern Paleoindian landscape and multiplying its lithic and archaeological stories; and eighth, for working within the “in between” places, landscapes and shapes that grow from such stories. Thus, telling lithic stories within La Martre’s plowed fields is a fourfold narrative: (i.) exploring how past people engaged with their landscape through knapping; (ii.) deconstructing conditions allowing for such an exploration; (iii.) creating new conditions allowing for new stories to be told; and (iv.) telling these new stories.
210

The Gatun Structure: A geological assessment of a newly recognized impact structure near Lake Gatun in the Republic de Panama

Tornabene, Livio Leonardo 01 November 2001 (has links)
The Gatun Structure (N 09º 05’ 58.1”, W 79º 47’ 21.8”, situated in the triple-canopy rainforest 10 km to the WSW of the Gamboa and about 2 km south of the Isle of Barbacoas, Republic de Panama), is a partially inundated, quasi-concentric surface feature ~3km in diameter, which appears in aerial photographs and in radar imagery as an arcuate chain of islands with a raised center. Although the structure has been heavily weathered and altered, it has retained morphology consistent with complex craters: an elevated circular central uplift 500-600 m in diameter and approximately 70 m high, and arcuate boundary ridges (a rim structure?) ranging from ~50-110 meters high. Within the central peak, highly altered and fractured siltstone of the Gatuncillo Formation (?) (Eocene) ± older rocks are uplifted and exposed through surrounding calcareous units of the Caimito Formation (Oligocene) and the Las Cascadas Formation (Miocene), the major target rocks in the region. Lithologies in the structure include highly fractured siliciclastic rocks (siltstone, sandstones and greywackes), limestones with anomalous spherical glass inclusions, both black and white hypocrystalline glasses (possible melt rocks), lithic fragmental breccias, and melt-bearing breccias (possible impact melt breccias and suevites) containing flow banding and evidence for selective melting of minerals. Three types of spherules (glass, fluid-drop and lithic), a pyroxenequartz “necklace” disequilibrium structure (coronas), plagioclase feldspars exhibiting mosaicism and partially amorphization and zeolitization, possible liquid immiscibility between melts of calcite and felpspathic glass, as well as decomposition of titano-magnetite, are all petrographic criteria that suggest a hypervelocity impact event. The structure is crosscut by numerous dikes of unshocked basalt and basaltic andesite related to volcanism along the Panamanian segment of the Central American arc to the south. However, the lithologies of the Gatun Structure are chemically inconsistent with the regional volcanic rocks and the unshocked volcanic rocks that crosscut the structure. An impact origin is our preferred interpretation for the Gatun structure due to the lack of an igneous relationship between the Gatun structure and the explosive volcanism of Panamanian arc, the presence of classical impactite lithologies within the site, the occurrence of spherules, maskelynite (as suggested by Raman Spectroscopy) and other disequilibrium shock features in the Gatun suite of rocks.

Page generated in 0.0467 seconds