scholarly journals Elateia 1 in Northeastern Thessaly 8000 Years Ago

2021 ◽  
Vol 48 ◽  
Author(s):  
Agathe Reingruber ◽  
Giorgos Toufexis ◽  
Yannis Maniatis
Keyword(s):  
Neolithic Period ◽  
Depositional Processes

Intensive and systematic surveys in the area south of Mount Olympos and west of Mount Ossa revealed not only tell settlements, but also several flat sites from different prehistoric periods. For one of the settlements, namely Elateia 1, a detailed relative chronological assessment was made with the help of statistical evaluations of pottery assemblages. In addition, short-lived bone samples confirmed and more precisely defined the exact chronological position of this 10-hectare site within the Middle Neolithic period. The present study underlines the importance of statistical evaluations of complete pottery assemblages, even those obtained through survey investigations, and their significance for a better understanding of chronological, chorological and post-depositional processes.

A correlation of CL emissions from Penrith sandstone with elemental distributions obtained by simultaneous SEM-CL and EDS analysis

1995 ◽  
Vol 53 ◽  
pp. 392-393
Author(s):  
Paul J. Wright
Keyword(s):  
Optical Microscope ◽  
Electron Gun ◽  
High Electron ◽  
Collection System ◽  
Electron Hole ◽  
Depositional Processes ◽  
Eds Analysis ◽  
Distribution Mapping ◽  
Backscattered Electron ◽  
Electron Imaging

Most industrial and academic geologists are familiar with the beautiful red and orange cathodoluminescence colours produced by carbonate minerals in an optical microscope with a cold cathode electron gun attached. The cement stratigraphies interpreted from colour photographs have been widely used to determine the post depositional processes which have modified sedimentary rock textures.However to study quartzose materials high electron densities and kV's are necessary to stimulate sufficient emission. A scanning electron microscope with an optical collection system and monochromator provides an adequate tool and gives the advantage of providing secondary and backscattered electron imaging as well as elemental analysis and distribution mapping via standard EDS/WDS facilities.It has been known that the incorporation of many elements modify the characteristics of the CL emissions from geological materials. They do this by taking up positions between the valence and conduction band thus providing sites to assist in the recombination of electron hole pairs.

‘Robenhausien’ in the Hunterian Museum

1981 ◽  
Vol 8 (1) ◽  
pp. 1-12
Author(s):  
Isobel M Hughes
Keyword(s):  
Organic Materials ◽  
Neolithic Period ◽  
Plant Remains ◽  
Neolithic Europe ◽  
The University

Summary A report is presented of a study of the material from Robenhausen and other sites of the Neolithic period in Switzerland, part of the Bishop Collection in the Hunterian Museum, the University of Glasgow. The material is described and its likely setting within the cultural sequence of the Swiss Neolithic is discussed. The importance of the collection is seen to lie in the finds of organic materials, artefacts and macroscopic plant remains, which afford a rare glimpse of detail in craftsmanship and husbandry in Neolithic Europe.

Using cattle for traction and transportduring the Neolithic period. Contribution of the study of the first and second phalanxes

2018 ◽  
Vol 115 (1) ◽  
pp. 71-98
Author(s):  
Daniel Helmer ◽  
Émilie Blaise ◽  
Lionel Gourichon ◽  
Maria Sana Segui
Keyword(s):  
Neolithic Period

DEPOSITIONAL PROCESSES OF BED III AND BED IV, OLDUVAI GORGE, TANZANIA: EXPANDING ON THE WORK OF RICHARD HAY, 1976

2018 ◽  
Author(s):  
John C. Kearney ◽  
◽  
Claudia C. Johnson ◽  
Jackson K. Njau ◽  
Kathy Schick ◽  
...  
Keyword(s):  
Olduvai Gorge ◽  
Depositional Processes

Late-Holocene palaeoenvironmental reconstruction from a lake in the Amazon Rainforest-Tropical Savanna (Cerrado) boundary in Brazil using a multi-proxy approach

The Holocene ◽  
2021 ◽  
pp. 095968362110190
Author(s):  
Kury Milena Souza ◽  
Moreira Luciane Silva ◽  
Cordeiro Renato Campello ◽  
Sifeddine Abdelfettah ◽  
Turcq Bruno ◽  
...  
Keyword(s):  
Late Holocene ◽  
Amazon Region ◽  
Amazon Rainforest ◽  
Oxbow Lake ◽  
Tropical Savanna ◽  
Sedimentary Process ◽  
Climatic Fluctuations ◽  
Climate Conditions ◽  
Depositional Processes ◽  
Lake Formation

As an ecotone, the region between the Amazon Rainforest and Tropical Savanna (Cerrado) biomes is, by definition, more susceptible to climate change. Therefore, understanding palaeoenvironmental dynamics is essential to address the future responses of such transition areas to climatic fluctuations. In this context, we present a new sediment record for the Late-Holocene retrieved from Barro-Preto, currently an oxbow lake located in an ecotone at the southern Brazilian Amazon border. Our multi-proxy data include carbon and nitrogen isotopes, as well as bulk TOC, chlorophyll derivatives, grain-size and microcharcoal analyses, all anchored on a radiocarbon-dated chronology. The sedimentary process recorded at the Barro-Preto Lake responded to both local and regional climate dynamics. It was influenced by river excursions associated to local responses to precipitation changes by the activation of the palaeochannel connecting the main-stem river and the Barro-Preto lake. This activation was evidenced by the presence of different colour lithology laminations accompanied by coarser sediments and also by climate conditions known to influence the Amazon region. Depositional processes linked to lake dynamics and different oxbow lake cycle stages were also important to explain the changes verified in the Barro-Preto record, endorsing the use of this lake formation for palaeoclimatic reconstructions. The record indicated a rising humidity trend, reflected by a progressive increase in lacustrine productivity, in accordance to other studies carried out in the Amazon region concerning the Late-Holocene, associated with a more southward displacement of the Intertropical Convergence Zone. Despite this rising humidity trend, dry episodic events during the Late-Holocene were evidenced by charcoal data, also coherent with regional Amazon studies, albeit exhibiting increased intensity, suggesting that the transitional nature of the environment might have influenced susceptibility to fires.

Three-dimensional stromatolites from Maastrichtian–Danian Yacoraite Formation, Argentina: modelling and assessing hydrodynamic controls on growth patterns

2021 ◽  
pp. 1-17
Author(s):  
Patricio Guillermo Villafañe ◽  
Carlos Cónsole-Gonella ◽  
Paolo Citton ◽  
Ignacio Díaz-Martínez ◽  
Silvina de Valais
Keyword(s):  
Environmental Factors ◽  
Methodological Approach ◽  
Three Dimensional ◽  
Growth Patterns ◽  
External Morphology ◽  
Water Dynamics ◽  
Microbial Composition ◽  
Depositional Processes ◽  
Run Off ◽  
Internal Arrangement

Abstract Stromatolites are biogenic sedimentary structures formed by the interplay of biological (microbial composition) and environmental factors (local hydrodynamic conditions, clastic input and/or water chemistry). Well-preserved, three-dimensional (3D) fossil stromatolites are key to assessing the environmental factors controlling their growth and resulting morphology in space and time. Here, we report the detailed analysis of well-exposed, highly informative stromatolite build-ups from a single stratigraphic horizon within the Maastrichtian–Danian Yacoraite Formation (Argentina). This study focuses on the analysis of depositional processes driving intertidal to shallow subtidal stromatolites. Overall depositional architecture, external morphology and internal arrangement (mega, macro, meso and microstructures) of stromatolite build-ups were analysed and combined with 3D photogrammetric models, allowing us to decipher the links between stromatolite structure and tidal dynamics. Results suggest that external morphology and architecture of elongated and parallel clusters grew under the influence of run-off channels. The internal morphology exhibits columnar structures where the space between columns is interpreted as recharge or discharge channels. This work supports the theory that stromatolites can be used as a high-resolution tool in the assessment of water dynamics, and provides a new methodological approach and data for the dynamic reconstruction of intertidal stromatolite systems through the geological record.

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