A tale of two signals: Global and local influences on the Late Pleistocene loess sequences in Bulgarian Lower Danube
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The basic characteristics of loess in Hengduan Mountains are studied in this pa_per,including the disrtrbution and physicochemical prorerties.According to the age of TL_Dating and differentiate glaciation,the loess was begun to deposit in about 100 000 a BP(at the beginning of late Pleistocene),after the maximum glaciation Quaternary. This is caused by the difference of the uplift of Qinghai-Xizang Plateau in regions and stages.
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The formation and variation of arid region,climate changes and temporal-spatial evolution of deserts,aeolian dust events series in center Asia is helpful to scientific understanding the impact of aeolian dust on climate changes in Asian arid region during the Quarternary,and study on the thick loess strata and paleoenvironmental record.Well located at the northern margin of Tianshan Mt,nearly 71m depth loess deposition in Dongwan Town of Shawan County provides good opportunity to investigate the regional environmental change. Systemic studies of climatic indicators including loess grain size,magnetic susceptibility,were carried out in aeolian loess section.Our study indicates that climatic and environmental evolution in northern Xinjiang region experienced three stages since middle Pleistocene.A relative wet climate dominated at the period of 0.80-0.60MaBP,aridity evolving at the period of 0.60-0.25MaBP and dry from 0.25MaBP to present.Climate became more and more arid over the time.Two important events were detected at the 0.60MaBP and 0.25MaBP respectively,which accelerated the aridity process in the region.Arid controlled climate today is formed no later than 0.25Ma.
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Research Article| October 01, 1970 A Significant Pleistocene Exposure in South-Central Indiana ALLAN F SCHNEIDER ALLAN F SCHNEIDER Indiana Geological Survey, Bloomington, Indiana 47401 AUTHOR'S PRESENT ADDRESS: DIVISION OF SCIENCE, UNIVERSITY OF WISCONSIN-PARKSIDE, KENOSHA, WISCONSIN 53140 Search for other works by this author on: GSW Google Scholar GSA Bulletin (1970) 81 (10): 3079–3084. https://doi.org/10.1130/0016-7606(1970)81[3079:ASPEIS]2.0.CO;2 Article history received: 26 Mar 1970 first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation ALLAN F SCHNEIDER; A Significant Pleistocene Exposure in South-Central Indiana. GSA Bulletin 1970;; 81 (10): 3079–3084. doi: https://doi.org/10.1130/0016-7606(1970)81[3079:ASPEIS]2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu nav search search input Search input auto suggest search filter All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract Unconsolidated deposits of the Pleistocene Series are exposed in a 50-ft railroad cut at the glacial boundary in northwestern Brown County, Indiana. The section exhibits a more complete sequence of Pleistocene sediments than do other exposures in south-central Indiana, it confirms an earlier interpretation that Kansan ice advanced somewhat beyond the Illinoian in this area, and it indicates the presence of both Peoria and pre-Peoria (Love-land?) loess deposits.Siltstone of the Borden Group (Mississippian System) at the base of the cut is overlain unconformably by 3.5 ft of unoxidized and oxidized till interpreted as Kansan. The till is overlain by about 30 ft of pebbly sand and fine gravel, much of which is strongly oxidized. In its upper part this deposit is altered to a sticky reddish sandy material that clearly represents a significant period of weathering. The sand and gravel is regarded as Illinoian outwash, and the weathering profile is interpreted as having formed during the interglacial Sangamonian Age.The section is capped by about 6 ft of silt, which is probably of eolian rather than lacustrine origin. In its lower part the loess is clayey and similar in color to the underlying weathered outwash but grades upward into more typical noncalcareous brown loess. The red silt is tentatively considered to be Illinoian and possibly early Sangamonian and the brown silt Wisconsinan in age. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not currently have access to this article.
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Huge changes in climate occurred at the end of the last Quaternary glaciation. The end of this glaciation corresponds with the end of Pleistocene with its repeated glacial cycles and the start of t ...
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Although much emphasis has been placed on the effects of Pleistocene ice sheet as the determinant of Pleistocene climate in Europe, only through the combined evaluation of all useful climatic indicators can Pleistocene climatic zones be differentiated. The relationships between a paleoclimatically determined snowline and polar treelines and extent of loess deposition, determined stratigraphically, botanically, and morphologically, also indicate climatic conditions of Pleistocene Europe. Five great climatic-morphologic and plant-geographic zones, namely, forest-rubble tundra, forest tundra, loess tundra, loess steppe, and loess-forest steppe, may be distinguished. Considering these factors and their characteristics and spatial and temporal extents, it is possible to chronologically present the differentiation of the Würm glacial period independent of the retardation effect of ice sheets. --G. E. Denegar.
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Thermoluminescence dating
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Optically stimulated luminescence
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