AMS Radiocarbon Dating of Lake Michigan Beach-Ridge and Dune Development

1997 ◽  
Vol 48 (1) ◽  
pp. 137-140 ◽  
Author(s):  
John Lichter
Keyword(s):  
Radiocarbon Dating ◽  
Lake Level ◽  
Sand Dune ◽  
Lake Michigan ◽  
Beach Ridge ◽  
Radiocarbon Dates ◽  
Beach Ridges ◽  
Ams Radiocarbon Dating ◽  
Climate Fluctuations ◽  
Radiocarbon Chronology

Strandplains of shore-parallel beach ridges bordering the Great Lakes are valuable for reconstructing histories of climate-related lake-level fluctuations. However, imprecise radiocarbon dates of ridge formation have frustrated development of dependable chronologies from which information about variation in the frequency of ridge formation and inferred climate fluctuations can be obtained. The resolution and precision of radiocarbon chronologies can be improved with AMS 14C dates of roots and rhizomes of plant species associated with the formation and growth of the sand-dune caps of breach ridges. These dates reliably estimate the timing of shore progradation when the base of the previously established beach ridge becomes inundated by the water table. An AMS radiocarbon chronology of beach-ridge formation in northern Lake Michigan shows that information about variation in the frequency of ridge formation is important for paleoclimatic interpretation.

Late-Holocene Formation of Lake Michigan Beach Ridges Correlated with a 70-yr Oscillation in Global Climate

1996 ◽  
Vol 45 (3) ◽  
pp. 321-326 ◽  
Author(s):  
Paul A. Delcourt ◽  
William H. Petty ◽  
Hazel R. Delcourt
Keyword(s):  
Late Holocene ◽  
Lake Michigan ◽  
Global Climate ◽  
Temperature Oscillation ◽  
Beach Ridges ◽  
Climate Fluctuations ◽  
The Past ◽  
Fundamental Part ◽  
Atmosphere System ◽  
Centennial Time Scale

AbstractA radiocarbon-dated series of 75 beach ridges, formed at regular intervals averaging 72 yr over the past 5400 yr, provides further support for the existence of a 70-yr oscillation in Northern Hemisphere climate, postulated recently from instrument data representing less than two cycles of this climate oscillation. Results from this study lend support to the interpretation that internal variations in the ocean–atmosphere system are an important factor in climate fluctuations on a decadal–centennial time scale. A temperature oscillation with a period of about 70 yr has been a previously unrecognized but fundamental part of the global climate system since at least the middle Holocene.

Lake Michigan Beach-Ridge and Dune Development, Lake Level, and Variability in Regional Water Balance

1995 ◽  
Vol 44 (2) ◽  
pp. 181-189 ◽  
Author(s):  
John Lichter
Keyword(s):  
Water Balance ◽  
Lake Level ◽  
Lake Michigan ◽  
Plant Macrofossils ◽  
Time Intervals ◽  
Beach Ridges ◽  
Average Return ◽  
High Lake Level ◽  
High Level ◽  
Regional Water

AbstractA sequence of northern Lake Michigan beach ridges records lake-level fluctuations that are probably related to changes in late Holocene climate. Historically, episodes of falling and low lake level associated with regional drought led to the formation of dune-capped beach ridges. The timing of prehistoric ridge formation, estimated by radiocarbon dating of plant macrofossils from early-successional dune species, shows that return periods of inferred drought, averaged for time intervals of 100 to 480 yr, ranged between 17 and 135 yr per drought during the last 2400 yr. In five of ten of these time intervals, the average return period ranged between 17 and 22 yr per drought. These intervals of frequent ridge formation and drought were associated with the development of parabolic dunes, which is indicative of high lake level and moist climate. This seeming paradox suggests that unusually moist decades alternated with unusually dry decades during these time intervals. Regional water balance probably varied less during the time intervals when ridges formed less often and the lake produced no evidence of high level.

Testing the Accuracy of 14C Age Data from Pollen Concentrates in the Yangtze Delta, China

Radiocarbon ◽  
2014 ◽  
Vol 56 (1) ◽  
pp. 181-187 ◽  
Author(s):  
Chunhai Li ◽  
Yongxiang Li ◽  
George S Burr
Keyword(s):  
Radiocarbon Dating ◽  
Liquid Scintillation ◽  
Scintillation Counting ◽  
Yangtze Delta ◽  
Plant Materials ◽  
Radiocarbon Dates ◽  
Ams Radiocarbon Dating ◽  
14C Age ◽  
Climate Events ◽  
Age Determinations

In order to test the accuracy of accelerator mass spectrometry (AMS) radiocarbon dating of pollen, 8 samples of pollen concentrates and 4 bulk organic samples were collected and analyzed from trench T1041 at the Tianluoshan site, Yuyao city, Zhejiang Province. This site was chosen because a reliable chronology had been previously established there based on radiocarbon dates of plant materials. The pollen concentrate samples were measured using AMS 14C and the 4 bulk organic samples were measured by liquid scintillation counting (LSC). The pollen concentrates and bulk organic samples yield ages that are a few hundred years to thousands of years older than those from plant materials, respectively. Contributions from reworked sediments can explain the older ages for the pollen concentrates and sediment organic dates. This study suggests that caution must be exercised when discussing millennial- or centennial-scale climate events based on chronologies that are controlled by age determinations of pollen concentrates.

scholarly journals Radiocarbon chronology of the paleolithic modern humans in Eastern Europe, Siberia and East Asia

2020 ◽  
Vol 5 (2) ◽  
pp. 122-146
Author(s):  
Yaroslav Kuzmin ◽  
Keyword(s):  
East Asia ◽  
Eastern Europe ◽  
Radiocarbon Dating ◽  
Western Siberia ◽  
Homo Sapiens ◽  
Methodological Issues ◽  
Radiocarbon Dates ◽  
Analytical Review ◽  
Radiocarbon Chronology ◽  
Independent Assessment

The article presents an analytical review of the direct radiocarbon dating of fossils of the modern anatomical humans (Homo sapiens sapiens; H. s. s.) found on the Paleolithic sites of Eastern Europe, Siberia and East Asia, with a brief overview of other regions in Eurasia. While one of the most ancient finds in Eurasia, which has a direct radiocarbon date is the Ust’-Ishim in Western Siberia (age — about 45,000 years); in Eastern Europe, the earliest H. s. s. are Kostenki 14 and Kostenki 1 (age — about 37,400–35,500 years). For a number of finds (such as Kostenki 18 and humans fossils from the Sungir site), there are serious problems that need to be solved with the help of new data. This is particularly clear for the Sungir where 21 radiocarbon dates based on different collagen fractions (bulk collagen; ultrafiltered collagen, and hydroxyproline), have been obtained and dates of the samples taken from the same skeleton often do not match with each other. Methodological issues of radiocarbon dating the bones, and the possibility of an independent assessment of the results obtained, are also considered. When preservation of collagen is good, which can be controlled through a number of parameters, dating of bulk collagen fraction seems to be reliable. Claims that only specific amino acids (such as hydroxyproline) give the only accurate radiocarbon dates for bones have not been strictly proven.

Radiocarbon Dating in Eastern Arctic Archaeology: A Flexible Approach

1981 ◽  
Vol 46 (2) ◽  
pp. 244-271 ◽  
Author(s):  
Wendy Hanford Arundale
Keyword(s):  
Marine Mammal ◽  
Radiocarbon Dating ◽  
Future Research ◽  
Radiocarbon Dates ◽  
Flexible Approach ◽  
Arctic Archaeology ◽  
Radiocarbon Chronology

Radiocarbon dates from marine mammal tissue present Arctic archaeologists with some difficult interpretive problems. These problems are so serious that McGhee and Tuck have even advocated omitting all sea mammal dates from the Eastern Arctic radiocarbon chronology. A flexible approach to interpreting sea mammal dates will allow researchers to use existing dates more effectively and to make future dates more reliable. Solving the problems with sea mammal dates requires: (1) abandoning the assumption that radiocarbon assays are quasi-absolute chronological indicators; (2) recognizing and understanding the sources of variability that affect these dates; (3) correcting for these sources of variability; and (4) developing a more flexible strategy for interpreting the resulting date sequence. A large table of radiocarbon dates from the Eastern Arctic provides the basis for demonstrating how these four steps can be accomplished. Applying this flexible approach also suggests directions and guidelines for future research.

scholarly journals Too Old AMS Radiocarbon Dates Obtained from Moss Remains from Lake Kwiecko Bottom Sediments (N Poland)

2008 ◽  
Vol 32 (-1) ◽  
pp. 13-19 ◽  
Author(s):  
Jacek Madeja ◽  
Dariusz Latowski
Keyword(s):  
Bottom Sediments ◽  
Pollen Analysis ◽  
Radiocarbon Dating ◽  
Radiocarbon Dates ◽  
Ams Radiocarbon Dating ◽  
Palynological Data

Too Old AMS Radiocarbon Dates Obtained from Moss Remains from Lake Kwiecko Bottom Sediments (N Poland)The paper presents the results of the AMS radiocarbon dating of moss macrofossils which seem to be too old in the context of palynological data. The lack of agreement between the obtained results of radiocarbon dating and pollen analysis has been discussed. Some possible causes of the discrepancies between the results of radiocarbon dating and palynological dating have been given.

scholarly journals Radiocarbon Chronology for Prehistoric Complexes of the Russian Far East: 15 Years Later

Radiocarbon ◽  
2012 ◽  
Vol 54 (3-4) ◽  
pp. 727-736 ◽  
Author(s):  
Yaroslav V Kuzmin
Keyword(s):  
Radiocarbon Dating ◽  
Russian Far East ◽  
Far East ◽  
Pottery Production ◽  
Ams Radiocarbon Dating ◽  
Age Correction ◽  
Radiocarbon Chronology ◽  
Far Eastern ◽  
Reservoir Age ◽  
The Russian Far East

The recent progress in radiocarbon dating of the prehistoric cultural complexes in the Russian Far East is discussed against the background of ancient chronologies for greater East Asia. Since 1997, the wide use of accelerator mass spectrometry (AMS) radiocarbon dating along with the continuation of conventional dating has allowed us to establish the age of several key Paleolithic, Neolithic, and Paleometal sites. It has also contributed to advancing a deeper understanding of the timing for the beginning of pottery production, maritime adaptation, and agriculture, and several other important issues in prehistoric chronology for the studied region. Reservoir age correction values for the Japan and Okhotsk seas are now used to adjust the age for samples of marine origin. Some of the cultural-chronological models for prehistoric far eastern Russian complexes put forward in the last 10 yr lack a solid basis, and are critically evaluated herein.

New Insights into the Radiocarbon Chronology of Iberian Megalithic Societies: The tholos-type Tombs of Mojácar (Almería, Spain)

2020 ◽  
pp. 1-23
Author(s):  
Gonzalo Aranda Jiménez ◽  
María Dolores Camalich Massieu ◽  
Dimas Martín Socas ◽  
Marta Díaz-Zorita Bonilla ◽  
Derek Hamilton ◽  
...  
Keyword(s):  
Radiocarbon Dating ◽  
Bayesian Framework ◽  
Sacred Landscape ◽  
Radiocarbon Dates ◽  
Funerary Rituals ◽  
Radiocarbon Chronology

In 2012, the authors undertook a radiocarbon dating programme to explore the chronology of southern Iberian megalithic societies. Thirty new radiocarbon dates were obtained for two tholos-type tombs, Loma de Belmonte and Loma del Campo 2, and analysed within a Bayesian framework. Results are discussed in the context of the prehistoric societies of the region and four main conclusions were reached: i) in both tombs, mortuary activity started in the last century of the fourth millennium although with significant differences in their timespan; ii) funerary rituals ended in Loma de Belmonte at least five centuries later than in Loma del Campo 2; iii) the tholoi can be considered the most recent type of tomb compared to other megalithic monuments with mortuary activity beginning in the first centuries of the fourth millennium; iv) the largest and most prominent settlement of the region, Las Pilas, was closely associated with this funerary and sacred landscape.

AMS Radiocarbon Dates of Pyroclastic-Flow Deposits on the Southern Slope of the Kuju Volcanic Group, Kyushu, Japan

Radiocarbon ◽  
2016 ◽  
Vol 59 (2) ◽  
pp. 483-488 ◽  
Author(s):  
Mitsuru Okuno ◽  
Shinji Nagaoka ◽  
Yoko Saito-Kokubu ◽  
Toshio Nakamura ◽  
Tetsuo Kobayashi
Keyword(s):  
Mass Spectrometry ◽  
Pyroclastic Flow ◽  
Accelerator Mass Spectrometry ◽  
Radiocarbon Dating ◽  
Southern Slope ◽  
Radiocarbon Dates ◽  
Ams Radiocarbon Dating ◽  
Volcanic Group ◽  
Lava Domes ◽  
History Of

AbstractThe Kuju volcanic group, located in central Kyushu, Japan, consists of small stratovolcanoes and lava domes. To refine the eruptive history of the group, we conducted accelerator mass spectrometry (AMS) radiocarbon dating of charcoal fragments from three pyroclastic-flow (PF) deposits on the southern slope. The obtained 14C dates are consistent with the geomorphology, stratigraphy, and thermoluminescence (TL) ages. The Handa PF deposits, which are products of the largest eruption of the group, were dated to ~53.5 ka BP. The Shirani and Muro PF deposits, which are block-and-ash flows, were dated to 44 to >50 cal ka BP and 35–39 cal ka BP, respectively. These ages can be correlated with TL ages for lava domes. This study demonstrates that the lava domes and associated PF deposits formed after the Handa eruption.

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