Academic literature on the topic 'Quaternary sediment dating'

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Journal articles on the topic "Quaternary sediment dating"

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Kapid, Rubiyanto, Wahyu Dwijo Santoso, and Halmi Insani. "Quaternary nannoplankton in the Northeast Java Basin." Berita Sedimentologi 47, no. 3 (December 28, 2021): 43–49. http://dx.doi.org/10.51835/bsed.2021.47.3.357.

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In Indonesia, nannofosils are commonly used for age estimation on Miocene marine sediment, but they are rarely performed on Quaternary sediment. This paper introduces two nannofossil biozones, Martini (1971) and Backman et al. (2012) and the comparison between the two biozones. An uninterrupted interval of marine sediments was described and picked for quantitative nannoplankton analysis. The samples were taken from Ledok Formation to Lidah Formation in Pati Region, Northeast Java Basin. The samples were prepared by quick smear slides method and and analyzed by quantitative field of view method. Martini (1971) biozone can be used to subdivide the Late Miocene–Pleistocene sediments into 5 biozones, but Backman et al. (2012) can be used to classify the same sediments into 8 biozones. The biozone subdivision from Backman et al. (2012) is more detailed than that of Martini (1971) because an updated dating and biozone in the three new dating zone data.
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Brown, Thomas A., D. Erle Nelson, Rolf W. Mathewes, John S. Vogel, and John R. Southon. "Radiocarbon Dating of Pollen by Accelerator Mass Spectrometry." Quaternary Research 32, no. 2 (September 1989): 205–12. http://dx.doi.org/10.1016/0033-5894(89)90076-8.

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AbstractRadiocarbon dating of bulk sediments has been the standard method for establishing chronologies in the studies of lake sediment cores which have contributed significantly to our knowledge of late Quaternary paleo-environments. These bulk sediment dates are presumed to be direct ageindicators for the speciments (e.g., pollen or macrofossils) which are actually being studied. However, several recent studies have reinforced long-standing apprehensions concerning this presumption. In this study, we demonstrate for the first time the radiocarbon dating of pollen concentrate samples by accelerator mass spectrometry. The dates obtained by this method should provide more reliable radiocarbon chronologies for paleo-environmental studies than have been obtainable by bulk sediment dating.
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Sawakuchi, André Oliveira, Vinicius Ribau Mendes, Fabiano do Nascimento Pupim, Thays Desiree Mineli, Ligia Maria Almeida Leite Ribeiro, Andre Zular, Carlos Conforti Ferreira Guedes, et al. "Optically stimulated luminescence and isothermal thermoluminescence dating of high sensitivity and well bleached quartz from Brazilian sediments: from Late Holocene to beyond the Quaternary?" Brazilian Journal of Geology 46, suppl 1 (June 2016): 209–26. http://dx.doi.org/10.1590/2317-488920160030295.

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ABSTRACT: The development of optically stimulated luminescence (OSL) dating of sediments has led to considerable advance in the geochronology of the Quaternary. OSL dating is a well established technique to determine sediment burial ages from tens of years to few hundred thousand years. Recent studies have shown that Quaternary sediments of Brazil are dominated by quartz grains with high luminescence sensitivity, allowing the determination of precise and reliable OSL burial ages. In this paper, we show examples of OSL dating of quartz aliquots and single grains from different regions in Brazil, including young coastal-eolian Late Holocene (< 100 years) to Late Pleistocene (~ 150 ka) fluvial sediments. We discuss the OSL data and ages of sediments from carbonate and terrigenous (distributary and tributary systems) fluvial depositional contexts in Brazil. Most of the studied fluvial sediments show equivalent dose distributions with low to moderate dispersion, suggesting well bleached sediments. The comparison between aliquot and single grain data suggests that high overdispersion in equivalent dose distributions of some samples is more related with sediment mixture due to bioturbation than with incomplete bleaching during transport. Well bleached fluvial sediments contrast with the poor bleached pattern usually described for fluvial sediments in the literature. A large part of the fluvial sedimentary record in Brazil is older than the age limit for quartz OSL dating using blue light stimulation. Thus, isothermal thermoluminescence (ITL) dating protocols were tested for dating of fluvial sands from the Xingu River (eastern Amazonia). The studied sample can recover reliable equivalent doses up to 1600 Gy using the ITL 310oC signal. Therefore, this signal would be suitable to extend the age limit of quartz luminescence to the whole Quaternary or beyond (> 2 Ma) in the low dose rate (0.5 - 1.0 Gy/ka) environments typical for Brazilian sediments.
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Zhou, Weijian, Douglas Donahue, and A. J. T. Jull. "Radiocarbon AMS Dating of Pollen Concentrated from Eolian Sediments: Implications for Monsoon Climate Change Since the Late Quaternary." Radiocarbon 39, no. 1 (1997): 19–26. http://dx.doi.org/10.1017/s0033822200040868.

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Dating pollen concentrated from eolian sediments provides a new way to establish a chronological framework on the Loess Plateau of China. We show that pollen deposited simultaneously with sediment in a stable environment can provide reliable ages. We suggest that the reliability of pollen dating can be evaluated by comparison with wood cellulose or charcoal ages from the same stratigraphic level. Dating pollen concentrates from the various profiles indicates paleomonsoon precipitation variability at the loess/desert transitional belt from the late Pleistocene to the early Holocene.
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Andrade, Ana C. S., José M. L. Dominguez, Louis Martin, and Abílio C. S. P. Bittencourt. "Quaternary evolution of the Caravelas strandplain - Southern Bahia State - Brazil." Anais da Academia Brasileira de Ciências 75, no. 3 (September 2003): 357–82. http://dx.doi.org/10.1590/s0001-37652003000300008.

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An evolutionary model is proposed for the Caravelas strandplain. The model encompasses integration of: (i) mapping of Quaternary deposits, (ii) cartography of beach-ridge alignments and their truncations, (iii) relative sea-level history, (iv) development history of the Abrolhos coral reefs, (v) vibra-coring and (vi) C14 dating of Quaternary deposits. Seven major evolutionary stages were identified. These stages show that the strandplain has had its Quaternary evolution strongly controlled by relative sea-level changes. In addition, the development of the Abrolhos coral reefs has also played an important role in dispersion and accumulation of sediments along the coastline, causing localized inversion in longshore sediment transport.
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Haslett, Simon K. "Late Neogene-Quaternary radiolarian biostratigraphy: a brief review." Journal of Micropalaeontology 23, no. 1 (May 1, 2004): 39–47. http://dx.doi.org/10.1144/jm.23.1.39.

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Abstract. Since the 1950s, it has become apparent that Radiolaria have significant biostratigraphical potential throughout Phanerozoic time, including the Late Neogene and Quaternary. Radiolarian biozonation schemes for this period have been developed, including a Standard Tropical Zonation, which illustrates the pan-oceanic application of radiolarian biostratigraphy to Pliocene–Quaternary sediments. The biostratigraphical resolution obtainable using Radiolaria is equivalent to other microfossil groups, such as planktonic foraminifera. The recognition of abundance events of Cycladophora davisiana, and of some other species, are an alternative radiolarian dating technique for the Pliocene–Quaternary, akin to dating sediment using oxygen stable isotope (δ18O) records and with similar resolution. A number of studies have used astronomical timescales, derived from orbitally tuning δ18O and gamma ray attenuation porosity evaluator (GRAPE) records, to provide ages for radiolarian biodatums. This approach should be adopted as a more accurate alternative to palaeomagnetic chronologies with their inherent flaws. This commentary concludes that Radiolaria are important microfossils and, as a group, continue to offer significant potential as a biostratigraphical tool in future studies of the marine Pliocene–Quaternary.
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Dehnert, Andreas, and Christian Schlüchter. "Sediment burial dating using terrestrial cosmogenic nuclides." E&G Quaternary Science Journal 57, no. 1/2 (August 1, 2008): 210–25. http://dx.doi.org/10.3285/eg.57.1-2.8.

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Abstract. Burial dating using in situ produced terrestrial cosmogenic nuclides is a relatively new method to date sediments and quantify geomorphological processes such as erosion, accumulation and river incision. Burial dating utilises the decay of previously in situ produced cosmogenic nuclides and can be applied to sedimentary deposits such as cave fillings, alluvial fans, river terraces, delta deposits, and dunes. Using the established 10Be/26Al nuclide pair allows numerical dating of quartz bearing material from ~100 ka to 5 Ma, where other dateable material is often unavailable. To date, a number of studies have demonstrated the successful application of in situ produced cosmogenic nuclides in various scientific disciplines, such as Quaternary geology, geomorphology and palaeoanthropology. However, insufficiently defined physical properties such as nuclide half lives and complex depth dependent nuclide production rates result in relatively large uncertainties. Nevertheless, burial dating represents a promising method for determining numerical ages.
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LYKOUSIS, V., G. ROUSAKIS, P. PAVLAKIS, and M. ALEXANDRI. "Stratigraphy and dating of a large slumping event in the Northern Aegean." Bulletin of the Geological Society of Greece 34, no. 2 (August 1, 2018): 671. http://dx.doi.org/10.12681/bgsg.17132.

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Continuous seismic (Air-Gun) subbotom profiling in the N.Aegean was revealed a large submarine translational slide. The failure zone is extended from about 300m depth down to 800 m and covers an area of 85 Km2. The mean thickness of the slide reaches about 55 m and an estimated total volume of 4 Km3 of Quaternary sediments have been slided along a distance of 6 to 7 Km. Chronostratigraphic analysis of the acoustic reflectors imply that the slide plane is the muddy layer of late Pleistocene age (170-240 Ka BP). AMS dating of sediment cores provided indications that this major slide event occurred 5 to 6 Ka BP.
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Gemmell, Alastair M. D. "Thermoluminescence in suspended sediment of glacier meltwater streams." Journal of Glaciology 40, no. 134 (1994): 158–66. http://dx.doi.org/10.1017/s0022143000003932.

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Abstract To determine the factors controlling natural levels of thermoluminescence (NTL) of fluvioglacially transported suspended sediment, samples were taken at hourly intervals from a meltwater stream emanating from Sólheimajökull in southern Iceland. The NTL of the samples were measured and compared with fluctuations in suspended-sediment load and in flow depth of the stream. It was found that the ratio of the 325°C and the 375°C regions of the NTL spectrum was more closely related to sediment load and flow depth than were the individual regions themselves. Analysis of the patterns suggests that NTL fluctuations are related to changes over time in the sources of sediment entrained by the stream. It is inferred that these changes relate to diurnal temperature cycles plus precipitation events. Such fluctuations raise doubts as to the validity of bulk sampling procedures in TL dating of Quaternary fluvioglacial sediments.
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Gemmell, Alastair M. D. "Thermoluminescence in suspended sediment of glacier meltwater streams." Journal of Glaciology 40, no. 134 (1994): 158–66. http://dx.doi.org/10.3189/s0022143000003932.

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AbstractTo determine the factors controlling natural levels of thermoluminescence (NTL) of fluvioglacially transported suspended sediment, samples were taken at hourly intervals from a meltwater stream emanating from Sólheimajökull in southern Iceland. The NTL of the samples were measured and compared with fluctuations in suspended-sediment load and in flow depth of the stream. It was found that the ratio of the 325°C and the 375°C regions of the NTL spectrum was more closely related to sediment load and flow depth than were the individual regions themselves. Analysis of the patterns suggests that NTL fluctuations are related to changes over time in the sources of sediment entrained by the stream. It is inferred that these changes relate to diurnal temperature cycles plus precipitation events. Such fluctuations raise doubts as to the validity of bulk sampling procedures in TL dating of Quaternary fluvioglacial sediments.
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Dissertations / Theses on the topic "Quaternary sediment dating"

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余耀良 and Yiu-leung Yieu. "OSL dating of sediment and climate change of late quaternary." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2013. http://hdl.handle.net/10722/192989.

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The objective of this project is to apply the Optical Stimulated Luminescence (OSL) technique to date the palaeo sediment from Mu Us Desert, part of the Inner Mongolia in northern China and reconstruct the palaeo environment. Five OSL samples were collected from Dagouwan, Salawusu River Valley at Inner Mongolia by Dr S. H. Li and his team in 2009. Extraction of 150μm to 180μm silt-size feldspar from collected dune sand, lacustrine facies and fluvial facies samples and running of luminescence dating therefore to obtain the age from 50ka to 90ka. Climate proxies - magnetic susceptibility, grain size, fossil vertebrates and fossil pollens have been analyzed and it is concluded that significant climate change occurred within this period, which change from domination of warm, humid and rainy summer monsoons (before 70ka) to cold, wind, windy strengthened dry winter wind and back to warm and humid again after 55ka.
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Applied Geosciences
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Fuller, Ian Christopher. "Alluvial response to environmental change : luminescence dating of late Quaternary sediment systems." Thesis, Aberystwyth University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.440428.

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Fan, Anchuan, and 范安川. "Quartz OSL dating of quaternary sediments from China." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B45700187.

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張家富 and Jiafu Zhang. "Development and application of luminescence dating to quaternary sediments from China." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2000. http://hub.hku.hk/bib/B31242662.

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Zhang, Jiafu. "Development and application of luminescence dating to quaternary sediments from China." Hong Kong : University of Hong Kong, 2000. http://sunzi.lib.hku.hk/hkuto/record.jsp?B22266628.

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Demory, François. "Paleomagnetic dating of climatic events in Late Quaternary sediments of Lake Baikal (Siberia)." Phd thesis, Universität Potsdam, 2004. http://opus.kobv.de/ubp/volltexte/2005/181/.

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Der Baikalsee ist ein ideales Klimaarchiv für die Mitte Eurasiens. In dieser Arbeit wurde gesteinsmagnetische und paleomagnetische Analysen an hemipelagischen Sequenzen von vier Lokationen analysiert. Die Kerne erreichen ein Alter von maximal 300 ky. In Kombination mit TEM, XRD, XRF und geochemischen Analysen zeigt die gesteinsmagnetische Studie, dass detritischer Magnetit das magnetische Signal der glazialen Sedimente dominiert. Die magnetischen Signale der interglazialen Sedimente wurden durch diagenetische Prozesse verändert. Mittels HIRM können Hämatit und Goethit quantifiziert werden. Diese Methode eignet sich, den detritischen Eintrag in den Baikalsee abzuschätzen. Relative Paleointensitäten des Erdmagnetfeldes ergaben reproduizerbare Muster, welche in Korrelation mit gutdatierten Referenzproben die Ableitung eines alternativen Altersmodells für die Datierung der Baikalsedimente ermöglichten. Bei Anwendung des paleomagnetischen Altersmodells beobachtet man, dass die Abkühlung im Baikalgebiet und im Oberflächenwasser des Nordatlantiks wie sie aus den δ18 O-Werten planktonischer Foraminiferen abgeleitet werden kann, zeitgleich ist. Wird das aus benthischen δ18 O-Werten abgeleitete Altermdodell auf den Baikalsee angewandt, ergibt sich eine deutliche Zeitverschiebung. Das benthische Altersmodell repräsentiert die globale Veränderung des Eisvolumens, welche später als die Vänderung der Oberflächenwassertemperatur auftritt. Die Kompilation paleomagnetischer Kurven ergab eine neue relative Paleointensitätskurve “Baikal 200”. Mittels Korngrössenanalyse des Detritus konnten drei Faziestypen mit unterschiedlicher Sedimentationsdynamik unterschieden werden: 1) Glaziale Peroiden werden durch hohe Tongehalte infolge von Windeintrag und durch grobe Sandfraktion mittels Transport durch lokale Winde über das Eis charakterisiert. Dieser Faziestyp deutet auf arides Klima. 2) Während der Glazial/Interglazial-Übergänge steigt die Siltfraktion an. Dies deutet auf erhöhte Feuchtigkeit und damit verbunden erhöhte Sedimentdynamik. Windtransport und in den Schnee der Eisdecke eingetragener Staub sind die vorherrschenden Prozesse, welche den Silt in hemipelagischer Position zur Ablagerung bringen. 3) Während des klimatischen Optimum des Eeemian werden Grösse und Quantität des Silts minimal, was auf eine geschlossene Vegetationsdecke im Hinterland deutet.
Lake Baikal provides an excellent climatic archive for Central Eurasia as global climatic variations are continuously depicted in its sediments. We performed continuous rock magnetic and paleomagnetic analyses on hemipelagic sequences retrieved from 4 underwater highs reaching back 300 ka. The rock magnetic study combined with TEM, XRD, XRF and geochemical analyses evidenced that a magnetite of detrital origin dominates the magnetic signal in glacial sediments whereas interglacial sediments are affected by early diagenesis. HIRM roughly quantifies the hematite and goethite contributions and remains the best proxy for estimating the detrital input in Lake Baikal. Relative paleointensity records of the earth′s magnetic field show a reproducible pattern, which allows for correlation with well-dated reference curves and thus provides an alternative age model for Lake Baikal sediments. Using the paleomagnetic age model we observed that cooling in the Lake Baikal region and cooling of the sea surface water in the North Atlantic, as recorded in planktonic foraminifera δ18 O, are coeval. On the other hand, benthic δ18 O curves record mainly the global ice volume change, which occurs later than the sea surface temperature change. This proves that a dating bias results from an age model based on the correlation of Lake Baikal sedimentary records with benthic δ18 O curves. The compilation of paleomagnetic curves provides a new relative paleointensity curve, “Baikal 200”. With a laser-assisted grain size analysis of the detrital input, three facies types, reflecting different sedimentary dynamics can be distinguished. (1) Glacial periods are characterised by a high clay content mostly due to wind activity and by occurrence of a coarse fraction (sand) transported over the ice by local winds. This fraction gives evidence for aridity in the hinterland. (2) At glacial/interglacial transitions, the quantity of silt increases as the moisture increases, reflecting increased sedimentary dynamics. Wind transport and snow trapping are the dominant process bringing silt to a hemipelagic site (3) During the climatic optimum of the Eemian, the silt size and quantity are minimal due to blanketing of the detrital sources by the vegetal cover.
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Stokes, Stephen. "Optical dating of selected Late Quaternary aeolian sediments from the southwestern United States." Thesis, University of Oxford, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.241370.

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Demory, François Tribovillard Nicolas Oberhänsli Roland. "Paleomagnetic dating of climatic events in late quaternary sediments of Lake Baikal (Siberia)." Villeneuve d'Ascq : Université des sciences et technologies de Lille, 2007. https://iris.univ-lille1.fr/dspace/handle/1908/338.

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Reproduction de : Thèse de doctorat : Dynamique et environnement sédimentaires : Lille 1 : 2004. Reproduction de : Doctoral thesis : Naturwissenschaften : Universität Potsdam : 2004.
Thèse en cotutelle. N° d'ordre (Lille 1) : 3513. Résumé en anglais, en allemand et en français. Titre provenant de la page de titre du document numérisé. Bibliogr. p. 91-101.
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Li, Bo. "Development and application of optical dating using quartz and potassium-feldspar from quaternary sediments." Click to view the E-thesis via HKUTO, 2007. http://sunzi.lib.hku.hk/HKUTO/record/B39557212.

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Li, Bo, and 李波. "Development and application of optical dating using quartz and potassium-feldspar from quaternary sediments." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B39557212.

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Books on the topic "Quaternary sediment dating"

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1935-, Easterbrook Don J., ed. Dating quaternary sediments. Boulder, Colo: Geological Society of America, 1988.

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Aitken, M. J. An introduction to optical dating: The dating of Quaternary sediments by the use of photon-stimulated luminescence. Oxford: Oxford University Press, 1998.

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Arason, Pórdur. Whole-core magnetic susceptibility measurements during the VNTR01 Expedition, 1989: Dating quaternary sediments using climate-susceptibility correlations. Corvallis, Or: College of Oceanography, Oregon State University, 1990.

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Arason, Pórdur. Whole-core magnetic susceptibility measurements during the VNTR01 Expedition, 1989: Dating quaternary sediments using climate-susceptibility correlations. Corvallis, Or: College of Oceanography, Oregon State University, 1990.

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Easterbrook, Don J. Dating Quaternary Sediments. Geological Society of America, 1988. http://dx.doi.org/10.1130/spe227.

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Easterbrook, Don J. Dating Quaternary Sediments. Geological Society of Amer, 1989.

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E&G - Quaternary Science Journal Vol. 60 No 1: Loess in Europe. Geozon Science Media, 2011.

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Uranium-trend systematics for dating Quaternary sediments. [Reston, Va.?]: U.S. Dept. of the Interior, Geological Survey, 1985.

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Geological Survey (U.S.), ed. Uranium-trend systematics for dating Quaternary sediments. [Reston, Va.?]: U.S. Dept. of the Interior, Geological Survey, 1985.

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Geological Survey (U.S.), ed. Uranium-trend systematics for dating Quaternary sediments. [Reston, Va.?]: U.S. Dept. of the Interior, Geological Survey, 1985.

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Book chapters on the topic "Quaternary sediment dating"

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Zolitschka, Bernd. "Absolute dating of late Quaternary Lacustrine sediments by high resolution varve chronology." In Environmental History and Palaeolimnology, 59–61. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3592-4_7.

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Sanderson, David C. W., and Timothy C. Kinnaird. "Optically Stimulated Luminescence Dating as a Geochronological Tool for Late Quaternary Sediments in the Red Sea Region." In Geological Setting, Palaeoenvironment and Archaeology of the Red Sea, 685–707. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99408-6_31.

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Moore, Christopher R., Mark J. Brooks, I. Randolph Daniel, Andrew H. Ivester, James K. Feathers, and Terry E. Barbour. "Regional Manifestations of Late Quaternary Climate Change and Archaeological Site Burial Along the South Atlantic Coastal Plain." In Early Human Life on the Southeastern Coastal Plain, 193–235. University Press of Florida, 2018. http://dx.doi.org/10.5744/florida/9781683400349.003.0010.

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Archaeological site investigations on the South Atlantic Coastal Plain have revealed stratified cultural remains in sand deposits of mixed aeolian and fluvial origins, aeolian sand sheets and dunes, alluvial terraces, and Carolina Bay rims. These sites are typically shallow but have yielded discernible archaeostratigraphy within sand dominated deposits by using luminescence dating (OSL), AMS radiocarbon dating, and close interval sediment sampling. Periods of site burial are linked to regional and global paleoclimate records, including Bond events, and provide broader reconstructions for human ecology and periods of site burial.
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Naeser, Charles W., and Nancy D. Naeser. "Fission-track dating of Quaternary events." In Dating Quaternary Sediments. Geological Society of America, 1988. http://dx.doi.org/10.1130/spe227-p1.

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Easterbrook, Don J. "Paleomagnetism of Quaternary deposits." In Dating Quaternary Sediments. Geological Society of America, 1988. http://dx.doi.org/10.1130/spe227-p111.

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Verosub, Kenneth L. "Geomagnetic secular variation and the dating of Quaternary sediments." In Dating Quaternary Sediments. Geological Society of America, 1988. http://dx.doi.org/10.1130/spe227-p123.

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Berger, Glenn W. "Dating Quaternary events by luminescence." In Dating Quaternary Sediments. Geological Society of America, 1988. http://dx.doi.org/10.1130/spe227-p13.

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Easterbrook, Don J., John L. Roland, Robert J. Carson, and Nancy D. Naeser. "Application of paleomagnetism, fission-track dating, and tephra correlation to Lower Pleistocene sediments in the Puget Lowland, Washington." In Dating Quaternary Sediments. Geological Society of America, 1988. http://dx.doi.org/10.1130/spe227-p139.

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Rutter, N. W., and C. K. Vlahos. "Amino acid racemization kinetics in wood; Applications to geochronology and geothermometry." In Dating Quaternary Sediments. Geological Society of America, 1988. http://dx.doi.org/10.1130/spe227-p51.

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Wehmiller, John F., Daniel F. Belknap, Brian S. Boutin, June E. Mirecki, Stephen D. Rahaim, and Linda L. York. "A review of the aminostratigraphy of Quaternary mollusks from United States Atlantic Coastal Plain sites." In Dating Quaternary Sediments. Geological Society of America, 1988. http://dx.doi.org/10.1130/spe227-p69.

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Conference papers on the topic "Quaternary sediment dating"

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Tomonaga, Yama, Edith Horstmann, Gaudenz Deplazes, and Rolf Kipfer. "4He/U-Th Dating of Pore Waters from Quaternary Sediments of the Swiss Midland." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.2609.

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Tomonaga, Yama, Marius Buechi, Gaudenz Deplazes, and Rolf Kipfer. "4He/U-Th dating of pore waters from Quaternary sediments of the Swiss Midland." In Goldschmidt2021. France: European Association of Geochemistry, 2021. http://dx.doi.org/10.7185/gold2021.5714.

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Reports on the topic "Quaternary sediment dating"

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Tweet, Justin S., Vincent L. Santucci, Kenneth Convery, Jonathan Hoffman, and Laura Kirn. Channel Islands National Park: Paleontological resource inventory (public version). National Park Service, September 2020. http://dx.doi.org/10.36967/nrr-2278664.

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Abstract:
Channel Island National Park (CHIS), incorporating five islands off the coast of southern California (Anacapa Island, San Miguel Island, Santa Barbara Island, Santa Cruz Island, and Santa Rosa Island), has an outstanding paleontological record. The park has significant fossils dating from the Late Cretaceous to the Holocene, representing organisms of the sea, the land, and the air. Highlights include: the famous pygmy mammoths that inhabited the conjoined northern islands during the late Pleistocene; the best fossil avifauna of any National Park Service (NPS) unit; intertwined paleontological and cultural records extending into the latest Pleistocene, including Arlington Man, the oldest well-dated human known from North America; calichified “fossil forests”; records of Miocene desmostylians and sirenians, unusual sea mammals; abundant Pleistocene mollusks illustrating changes in sea level and ocean temperature; one of the most thoroughly studied records of microfossils in the NPS; and type specimens for 23 fossil taxa. Paleontological research on the islands of CHIS began in the second half of the 19th century. The first discovery of a mammoth specimen was reported in 1873. Research can be divided into four periods: 1) the few early reports from the 19th century; 2) a sustained burst of activity in the 1920s and 1930s; 3) a second burst from the 1950s into the 1970s; and 4) the modern period of activity, symbolically opened with the 1994 discovery of a nearly complete pygmy mammoth skeleton on Santa Rosa Island. The work associated with this paleontological resource inventory may be considered the beginning of a fifth period. Fossils were specifically mentioned in the 1938 proclamation establishing what was then Channel Islands National Monument, making CHIS one of 18 NPS areas for which paleontological resources are referenced in the enabling legislation. Each of the five islands of CHIS has distinct paleontological and geological records, each has some kind of fossil resources, and almost all of the sedimentary formations on the islands are fossiliferous within CHIS. Anacapa Island and Santa Barbara Island, the two smallest islands, are primarily composed of Miocene volcanic rocks interfingered with small quantities of sedimentary rock and covered with a veneer of Quaternary sediments. Santa Barbara stands apart from Anacapa because it was never part of Santarosae, the landmass that existed at times in the Pleistocene when sea level was low enough that the four northern islands were connected. San Miguel Island, Santa Cruz Island, and Santa Rosa Island have more complex geologic histories. Of these three islands, San Miguel Island has relatively simple geologic structure and few formations. Santa Cruz Island has the most varied geology of the islands, as well as the longest rock record exposed at the surface, beginning with Jurassic metamorphic and intrusive igneous rocks. The Channel Islands have been uplifted and faulted in a complex 20-million-year-long geologic episode tied to the collision of the North American and Pacific Places, the initiation of the San Andreas fault system, and the 90° clockwise rotation of the Transverse Ranges, of which the northern Channel Islands are the westernmost part. Widespread volcanic activity from about 19 to 14 million years ago is evidenced by the igneous rocks found on each island.
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