scholarly journals The means of complexity in a lithic reduction sequence

2020 ◽  
pp. 0
Author(s):  
Arzarello Marta
2021 ◽  
Vol 70 (1) ◽  
pp. 123-128
Author(s):  
Galina D. Pavlenok ◽  
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Maxim B. Kozlikin ◽  
Michael V. Shunkov ◽  
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...  

The paper discusses the results from an analysis of five cores associated with Layer 11 in the Southern Chamber of Denisova Cave, intended to obtain small elongated blanks such as bladelets and small blades. Analysis of a lithic reduction sequence employed in the research has made it possible to clearly recognize the phases in producing flake scars on lithic artifacts through the preparation of core blanks, and in core reduction, as well as to determine stages at which some of these pieces were used as tools. The analysis provided insights into a general flaking pattern for the cores under study. Such artifacts were predominantly made on large massive flake blanks, had a plain striking platform, and the working edge showing traces of reduction associated with detaching the target flakes. These technological characteristics are fully consistent with the technological repertoire of a hominin group, based on cores from the same assemblage, intended to obtain larger target removals such as flakes and blades. A cross section of the flaking surface shows no evidence for a deliberately created and maintained convex relief, while typologically four of the five artifacts were defined as sub-prismatic. The analysis of a lithic reduction sequence shows that artifacts from the examined collection related to the production of blanks in the form of small flake-blades, without using new techniques and the controlled reduction of a flaking surface.


Author(s):  
João Pedro Cunha Ribeiro

A descoberta de uma nova ocupação arqueológica na jazida paleolítica do Castelo Velho ocorreu nodecurso de trabalhos de investigação sobre o Paleolítico Inferior, na margem direita do rio Tejo, na áreaabrangida pelos concelhos do Entroncamento, Golegã e Torres Novas. Quando procedemos à relocalizaçãodesta jazida, ao seu estudo e enquadramento na cronoestratigrafia das formações quaternárias da região,detectou-se um depósito coluvionar que, localmente, se sobrepõe de forma parcial às formações fluviaisdo rio Tejo aí representadas – Ft4 e Ft5 – associado a uma significativa concentração de materiais líticostalhados. A posterior realização de uma escavação arqueológica no local possibilitou a recolha de umaindústria lítica com mais de 250 peças baseada na exploração local do quartzito sob a forma de calhausrolados. O estudo desta colecção permitiu verificar a preponderância de uma cadeia operatória de debitagemcentrípeta, não Levallois, associada à presença quase exclusiva de alguns utensílios sobre lasca, oque levou a associar a indústria lítica ao Paleolítico Médio. Tendo em conta a posição estratigráfica dacoluvião e a pedogénese que a afecta, admite-se que a mesma se terá formado depois da deposição daúltima formação fluvial, localmente representada em Castelo Velho (Ft5), mas num momento anterior aoinício da deposição da formação fluvial mais recente do rio Tejo (Ft6), o que está de acordo com a classificaçãoproposta e sugere, aparentemente, uma datação relativamente antiga para a indústria no quadrodo Paleolítico Médio em Portugal. The discovery of a new archaeological occupation in the Paleolithic site of Castelo Velho occurred duringa research campaign on Lower Paleolithic of the right bank of Tejo River, in the area of Entroncamento,Golegã and Torres Novas municipalities. When we were relocating, studying and matching this LowerPaleolithic site in the chronostratigraphy of the regional Quaternary deposits, we have found a colluvialdeposit, partially overlaid to the terraces of Tejo River existing there – Ft4 and Ft5 – associated to asignificant concentration of lithic implements. A later archaeological excavation in this deposit allowedus to collect a lithic industry with more than 250 implements developed from local quartzite pebbles. Thestudy of this assemblage show mainly the presence of a lithic reduction sequence based on a centripetaldebitage, without Levallois products, with the almost exclusive presence of flake tools, allowed us toassociate this lithic industry to the Middle Paleolithic. When observing the stratigraphical position of thecolluvial deposit and its pedogenesis, we might admit that it was formed after the deposition of the lastlocal terrace of Castelo Velho (Ft5), but in a moment that was previous to the beginning of the depositionof the most recent terrace of the Tejo River (Ft6), which are in accord with the proposal classificationand leads us to a relatively old chronology of the industry inside the Portuguese Middle Paleolithic.


2007 ◽  
Vol 5 ◽  
Author(s):  
Tigran M. Galoyan

In this paper we discuss strong normalization for natural deduction in the →∀-fragment of first-order logic. The method of collapsing types is used to transfer the result (concerning strong normalization) from implicational logic to first-order logic. The result is improved by a complement, which states that the length of any reduction sequence of derivation term r in first-order logic is equal to the length of the corresponding reduction sequence of its collapse term rc in implicational logic.


2001 ◽  
Vol 28 (6) ◽  
pp. 619-631 ◽  
Author(s):  
Clifford T. Brown

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