Skip to Main Content. Skip to Search Box. Skip to Top Navigation Bar. Skip to Left Navigation Bar. Skip to Organizational Offices. Skip to Bottom Navigation. This study differs from previous work in the southeastern Atlantic Coastal Plain in that numerical age estimates are provided for all terraces in the valley of mappable extent by direct dating of fluvial sediments. The Little River valley contains a floodplain and five fluvial terraces with average heights above modern river bed level that range from 3. Dating indicates the floodplain has a late Holocene 1. Age separation of the six fluvial surfaces is corroborated by distinct differences in soil morphology and chemistry.
The Open Geography Journal
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Viveen, R. Braucher, D. Schoorl , A. Veldkamp, R. Wallinga , D. Fernandez-Mosquera, J. Vidal-Romani, J. Accurate dating of the terraces was difficult due to saturation of the luminescence signal and high inheritance of 10Be concentrations. Nevertheless, minimum ages of up to ka could be determined and are very likely close to the real ages of the terraces. The age estimations and field evidence suggest that terrace formation and terrace incision occurred during eccentricity-forced cycles of glacio-eustatic sea level changes and tectonic uplift.
It is furthermore hypothesised that the transition periods between glacials and interglacials were especially important for terrace deposition and incision. Denudation rates of the terraces were calculated from the 10Be data and do not exceed 1. These extremely low rates are probably the result of a combination of factors that favoured terrace preservation.
The terraces of Atene
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The Yellow River terraces in the Jinshaan Canyon have been widely investigated, and dated mainly using luminescence techniques and.
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A publication of the Archaeological Institute of America. Archaeologists uncover evidence suggesting rice terraces helped the Ifugao resist Spanish colonization. High in the Philippine Cordilleras , the terrain is a work of engineering and art so stunning it has been called the Eighth Wonder of the World. Steep, furrowed mountains are sculpted into terraces, stacked one atop the other, following the craggy contours of the land.
In lush green paddies, people cultivate rice just as their ancestors did, passing the land down from one generation to the next. This intricate agroecological system, he says, highlights the consonance between human needs and sustainable ecological management. While some terraces likely existed in Ifugao centuries before that, Acabado says, evidence suggests they were used for growing taro, not rice, and that those terraces were small. Imagine the difference between a backyard garden and the expansive farm fields that define much of the American Midwest.
According to him, the spectacular landscape that garnered Ifugao World Heritage status dates to an era that coincides with the arrival of Spanish colonizers. For Acabado, that changes everything. The dominant historical narrative told throughout the Philippines is a story of small, remote minority populations that moved higher and higher into the mountains over millennia as waves of new people arrived and settled in the lowlands.
It is accepted that Spanish colonizers were unable to conquer the Ifugao because the terrain they occupied was so rugged.
OSL dating the Pleistocene river terraces of the Hampshire Avon valley, results from Ashley pit
Robert Anderson. Gravel-capped strath terraces are preserved along the western High Plains, adjacent to the Colorado Front Range. Terrace elevations appear to connect across the landscape, representing previous levels of the Denver Basin during fluvial exhumation. In this tectonically quiescent region, climatically-driven fluctuations in sediment supply are often interpreted to drive terrace occupation and basin exhumation.
Fossil coral reef terraces at the northern coast of Cuba in the vicinity of the Bay of Matanzas are forming a prominent flight of terraces. These terraces were already studied by several investigators, but a chronological classification based on numerical dating is still missing. In this study we focus on the lowest unit, the Seboruco terrace, which is assumed to be of MIS 5e age. The morphology of the Seboruco terrace and associated sea-level markers reef crests and notches were mapped and their altitude was measured over the whole study area in the field and by using remote sensing.
The fossil corals building up the terrace were surveyed in numerous natural outcrops. The species of the fossil coral reefs were determined and subdivided in different facies zones. Both dating techniques yielded age results in good agreement with each other and the stratigraphic context. Corresponding to the field evidence, the age data indicates one MIS 5e sea-level highstand around ka.
At one locality east of Matanzas, the radiometric results for an underlying coral reef body suggest an MIS 7 age. The sea-level markers for the MIS 5e highstand range from 5.
In: Quaternaire , vol. Fluvial Archives Group. Clermond-Ferrant
Radiocarbon dating of floodplain and young terraces alluvial sediments of Latvia rivers; Latvijas upju terasu un palienu aluvialo nogulumu.
Although luminescence signals bleach rapidly with sunlight exposure, incomplete bleaching may affect luminescence ages, in particular in fluvial settings where an unbleached remnant signal is commonly encountered in modern alluvium. We relate this pattern to the rapid reinstatement of steady-state incision following the formation of a major, climate-driven, aggradation terrace, causing a phase of accelerated incision. In addition, we show systematic variations in the proportion of unbleached grains in the fluvial sediments over time, mirroring incision rate at the time of deposition.
Deposits formed during rapid incision contain fewer bleached grains, which we attribute to large input of unbleached material and limited bleaching opportunities during fluvial transport. This finding demonstrates that the luminescence signals recorded in fluvial terraces not only yield age information, but also inform us on past fluvial transport and ultimately, landscape dynamics. Those based on Optically Stimulated Luminescence OSL on quartz or on Infrared Stimulated Luminescence IRSL on feldspars allow estimation of the time of deposition and burial of sediments 1 , 6 , but sometimes give overestimated ages when light-exposure has not been sufficient to reset the luminescence signals prior to burial 7 , a problem that can be significant in fluvial settings.