COSMOGENIC NUCLIDES (26)Al/(10)Be BURIAL DATING OF YELLOW RIVER GRAVEL TERRACES AROUND YEMINGSHAN HILL,NINGXIA,CHINA
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Cosmogenic nuclide
River terraces
Surface exposure dating
Terrace (agriculture)
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北海道北部の下川町上名寄に分布する中部~上部中新統パンケ層から33分類群より構成される大型植物化石群(上名寄植物群)を得た.パンケ層の堆積相解析と植物化石の組成,産状を基に上名寄植物群の示す古植生を復元した.上名寄植物群の示す古植生は,カツラ属やAcer subcarpinifolium(カエデ属),トウヒ属が優占する河畔植生,トクサ属やタケ亜科単子葉類,トウヒ属,ヤナギ属が優占する後背湿地植生,カツラ属やヤナギ属,フジキ属が優占する湖岸植生,湖周辺ではあるがブナ属優占の山地斜面のブナ林が強調された植生の4タイプの植生を認めた.上名寄植物群の組成的特徴は後期中新世~鮮新世前期の三徳型植物群と言える.堆積相と化石の産状から,上名寄植物群の主要構成種は,それらの近似現生種と同じ生育環境と考えられる.したがって,生態的に現在の植生に対比可能な群集が少なくとも北海道においては,中期中新世後期~後期中新世に成立していたことを示している.
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Abstract In 2016–2018 in Starogród, in historical Chełmno Land in northern‐central Poland, remains were discovered of a stronghold (convent house) of the Knights of the Teutonic Order that was founded in the 1230s. After a search lasting more than 100 years, remains were also discovered of the oldest and repeatedly translocated city of Chełmno, which was founded by the German Knights at the same time. Non‐invasive and archaeological studies were conducted as part of the project Castra Terrae Culmensis, at the edges of the Christian world , whose main aim was to answer central questions concerning the beginnings of the State of the Teutonic Order in Prussia. One specific goal was to discover the oldest location of the aforementioned city, founded in 1232. The article presents the results of geophysical, archaeological and geomatic analyses that confirm historical records in the fourteenth‐century German Chronicle and helped to piece together the history of the place where one of the oldest Teutonic Order earth‐and‐timber strongholds and cities chartered under Chełmno Law stood.
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Abstract The article presents the results of the reconstruction of the yield of grain crops of the economy of the Volchikhinsky district of the Altai Territory (south of Western Siberia) on the basis of an extended tree-ring chronology until 1822. Based on the restored series, the cyclical nature of cereal productivity was analyzed. In particular, the 22-, 25-, and 27-year cycles are highlighted as the most significant. The increase in the amplitude of variability of the yield series was noted by year from the middle of the 19th century to the end of the 20th century.
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ABSTRACT Ambiguous landscape histories can arise from equivocal or incomplete geomorphological, sedimentological or geochronological evidence. In this study, we apply quantitative analyses to robustly assess the origin and age of a field of rounded mounds, known as ‘The Hillocks’. Using clast analysis, the sediment is shown to be consistent with a landslide origin but inconsistent with other glacial sediments in the region. Cosmogenic 10 Be exposure age dating suggests The Hillocks formed ~8 ka. Ground‐penetrating radar reveals that the deposit rests upon deltaic foreset beds; combined with topographical data, we calculate a deposit volume of ~15–27 M m 3 , consistent with the estimated volume of the proposed source area. Overall, our data support a rock avalanche origin, indicating that by 8 ka the valley was ice‐free at The Hillocks’ location, and the level of Lake Wakatipu was lower than 340 m asl by this time. The Dart River delta shoreline was situated somewhere between The Hillocks and the present day shoreline at that time, and has prograded at a maximum average rate of 1 m a −1 since ~8 ka. These findings are significant given the lack of landforms by which to constrain glacial or post‐glacial landscape histories in this region of New Zealand. Copyright © 2019 John Wiley & Sons, Ltd.
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