scholarly journals Radiocarbon Calibration by Means of Varves Versus 14C Ages of Terrestrial Macrofossils from Lake Gościąż and Lake Perespilno, Poland

Radiocarbon ◽  
2000 ◽  
Vol 42 (3) ◽  
pp. 335-348 ◽  
Author(s):  
Tomasz Goslar ◽  
Maurice Arnold ◽  
Nadine Tisnerat-Laborde ◽  
Christine Hatté ◽  
Martine Paterne ◽  
...  
Keyword(s):  
Calibration Curve ◽  
Younger Dryas ◽  
Late Glacial ◽  
Cariaco Basin ◽  
Rapid Decline ◽  
Radiocarbon Dates ◽  
Radiocarbon Calibration

This paper presents radiocarbon dates of terrestrial macrofossils from Lakes Gościąż and Perespilno, Poland. These data agree very well with most of the German pine calibration curve. In the Late Glacial, they generally agree with the data from Lake Suigetsu, Japan, and indicate constant or even increasing 14C age between 12.9 and 12.7 ka BP, rapid decline of 14C age around 12.6 ka BP, and a long plateau 10,400 14C BP around 12 ka BP. Correlation with corals and data from the Cariaco basin seems to support the concept of site-speficic, constant values of reservoir correction, in contradiction to those introduced in the INTCAL98 calibration. Around the Allerød/Younger Dryas boundary our data strongly disagree with those from the Cariaco basin, which reflects large discrepancy between calendar chronologies at that period. The older sequence from Lake Perespilno indicates two periods of rapid decline in 14C age, around 14.2 and 13.9 ka BP.

scholarly journals Tree-Ring Records of Near-Younger Dryas Time in Central North America—Preliminary Results from the Lincoln Quarry Site, Central Illinois, Usa

Radiocarbon ◽  
2004 ◽  
Vol 46 (2) ◽  
pp. 933-941 ◽  
Author(s):  
Irina P Panyushkina ◽  
Steven W Leavitt ◽  
Alex Wiedenhoeft ◽  
Sarah Noggle ◽  
Brandon Curry ◽  
...  
Keyword(s):  
North America ◽  
Tree Ring ◽  
Environmental Changes ◽  
Ring Width ◽  
Younger Dryas ◽  
Late Glacial ◽  
Radiocarbon Dates ◽  
Initial Sampling ◽  
Central Illinois ◽  
A Site

The abrupt millennial-scale changes associated with the Younger Dryas (YD) event (“chronozone”) near the dawn of the Holocene are at least hemispheric, if not global, in extent. Evidence for the YD cold excursion is abundant in Europe but fairly meager in central North America. We are engaged in an investigation of high-resolution environmental changes in mid-North America over several millennia (about 10,000 to 14,000 BP) during the Late Glacial–Early Holocene transition, including the YD interval. Several sites containing logs or stumps have been identified and we are in the process of initial sampling or re-sampling them for this project. Here, we report on a site in central Illinois containing a deposit of logs initially thought to be of YD age preserved in alluvial sands. The assemblage of wood represents hardwood (angiosperm) trees, and the ring-width characteristics are favorable to developing formal tree-ring chronologies. However, 4 new radiocarbon dates indicate deposition of wood may have taken place over at least 8000 14C yr (6000–14,000 BP). This complicates the effort to develop a single floating chronology of several hundred years at this site, but it may provide wood from a restricted region over a long period of time from which to develop a sequence of floating chronologies, the timing of deposition and preservation of which could be related to paleoclimatic events and conditions.

scholarly journals Revisions and Extension of the Hohenheim Oak and Pine Chronologies: New Evidence About the Timing of the Younger Dryas/Preboreal Transition

Radiocarbon ◽  
1998 ◽  
Vol 40 (3) ◽  
pp. 1107-1116 ◽  
Author(s):  
Marco Spurk ◽  
Michael Friedrich ◽  
Jutta Hofmann ◽  
Sabine Remmele ◽  
Burkhard Frenzel ◽  
...  
Keyword(s):  
Calibration Curve ◽  
Younger Dryas ◽  
Ice Cores ◽  
Early Holocene ◽  
Proxy Data ◽  
The Past ◽  
Varve Chronology ◽  
New Evidence ◽  
Radiocarbon Calibration

Oak and pine samples housed at the Institute of Botany, University of Hohenheim, are the backbone of the early Holocene part of the radiocarbon calibration curve, published in 1993 (Becker 1993; Kromer and Becker 1993; Stuiver and Becker 1993; Vogel et al. 1993). Since then the chronologies have been revised. The revisions include 1) the discovery of 41 missing years in the oak chronology and 2) a shift of 54 yr for the oldest part back into the past. The oak chronology was also extended with new samples as far back as 10,429 BP (8480 BC). In addition, the formerly tentatively dated pine chronology (Becker 1993) has been rebuilt and shifted to an earlier date. It is now positioned by 14C matching at 11,871-9900 BP (9922–7951 BC) with an uncertainty of ±20 yr (Kromer and Spurk 1998). With these new chronologies the 14C calibration curve can now be corrected, eliminating the discrepancy in the dating of the Younger Dryas/Preboreal transition between the proxy data of the GRIP and GISP ice cores (Johnsen et al. 1992; Taylor et al. 1993), the varve chronology of Lake Gościąż (Goslar et al. 1995) and the pine chronology (Becker, Kromer and Trimborn 1991).

Bell Beakers in Spain and Portugal: working with radiocarbon dates in the 3rd millennium BC

Antiquity ◽  
1988 ◽  
Vol 62 (236) ◽  
pp. 464-472 ◽  
Author(s):  
Richard J. Harrison
Keyword(s):  
Calibration Curve ◽  
Radiocarbon Dates ◽  
Radiocarbon Calibration

The recommended Belfast/Seattle radiocarbon calibration (Pearson 1987) coming into common use gives us ‘good’ portions, where the calibration curve has a shape that aids in refining dates, and ‘sloughs of despond’ - the periods when the shape of the curve is less helpful. Two deep sloughs arefound in the last few centuries ncand in the 3rd millennium BC. Here, a series of new determinations are presented for Bell Beakers in Spain, falling in the 3rd-millennium slough, and it is shown what can and cannot be learnt from these and their calibration.

scholarly journals Problems in the Extension of the Radiocarbon Calibration Curve (10–13 kyr BP)

Radiocarbon ◽  
1995 ◽  
Vol 37 (1) ◽  
pp. 75-79 ◽  
Author(s):  
Irena Hajdas ◽  
Susan D. Ivy-Ochs ◽  
Georges Bonani
Keyword(s):  
Mass Spectrometry ◽  
Time Scales ◽  
Calibration Curve ◽  
Accelerator Mass Spectrometry ◽  
Radiocarbon Dating ◽  
Late Glacial ◽  
Varved Lake Sediments ◽  
Ams Dating ◽  
Varve Counting ◽  
Radiocarbon Calibration

Radiocarbon dating of varved lake sediments shows that, during the Late Glacial (10–12 kyr bp), the offset between the 14C and the absolute time scales was ca. 1 kyr. Varve counting and accelerator mass spectrometry (AMS) dating were used to build absolute and 14C time scales of sediments from two lakes—Soppensee, Switzerland and Holzmaar, Germany. The resulting chronologies extend back to ca. 12.9 kyr cal bp (12.1 kyr bp) in the case of Soppensee and to ca. 13.8 kyr cal BP (12.6 kyr bp) in the Holzmaar record. They compare well with each other but differ significantly from the 14C-U/Th chronology of corals (Bard et al. 1993; Edwards et al. 1993).

Synchronizing a Late Glacial Abrupt Cooling Event with Paleoenvironmental and Population Changes: Case Study of the Moervaart Paleolake Area (NW Belgium)

Radiocarbon ◽  
2014 ◽  
Vol 56 (2) ◽  
pp. 899-912 ◽  
Author(s):  
Philippe Crombé ◽  
Erick Robinson ◽  
Mark van Strydonck
Keyword(s):  
Bayesian Modeling ◽  
Younger Dryas ◽  
Open Water ◽  
Late Glacial ◽  
Water Systems ◽  
Lake Area ◽  
Population Changes ◽  
Hunter Gatherers ◽  
Radiocarbon Dates

Sum probability and Bayesian modeling of a substantial series of radiocarbon dates from a former extensive lake area in NW Belgium, known as the Moervaart area, allow important hydrological changes to be synchronized with Greenland Interstadial lb (or Intra-Allerød Cold Period). It is postulated that the disappearance of nearly all open water systems (Moervaart lake, anastomosing gullies, and dune-slacks) in response to this short but abrupt cooling event was responsible for a nearly total retreat of hunter-gatherers already some centuries before the start of Greenland Stadial 1 (Younger Dryas).

A Younger Dryas Icecap in the Equatorial Andes

1997 ◽  
Vol 47 (1) ◽  
pp. 13-28 ◽  
Author(s):  
Chalmers M. Clapperton ◽  
Minard Hall ◽  
Patricia Mothes ◽  
Malcolm J. Hole ◽  
John W. Still ◽  
...  
Keyword(s):  
Younger Dryas ◽  
Late Glacial ◽  
Tropical Andes ◽  
Outlet Glacier ◽  
Radiocarbon Dates ◽  
Glacial Ice ◽  
Ice Cap ◽  
North Atlantic Climate ◽  
Organic Deposits ◽  
Younger Dryas Event

AbstractMorphologic and stratigraphic evidence shows that a late-glacial ice cap existed on part of the Eastern Cordillera of Ecuador (Lat. 0° 20′ S) on ground with a mean elevation of 4200 m where none exists now. An outlet glacier from an ca. 800 km2ice cap terminated at 3850 m altitude in the Papallacta valley on the eastern side of the plateau. Radiocarbon dates show that moraines formed by this advance were ice-free by 13,20014C yr B.P. Tephras and the age of organic deposits at the plateau edge indicate ice-free conditions before 11,80014C yr B.P. This interval was followed by the expansion of an ca. 140 km2ice cap that discharged glaciers into adjacent valleys where terminal moraines were built at 3950 m altitude. AMS and conventional radiocarbon dates from macrofossils, peat, and gyttja above and below till of the readvance indicate that the ice cap formed between ca. 11,000 and 10,00014C yr B.P. and was thus coeval with the European Younger Dryas event. The ice cap developed in response to a surface temperature cooling of at least 3°C in the tropical Andes, a finding that is consistent with a coupled equatorial/high latitude North Atlantic climate system operating at the late-glacial/Holocene transition. These results are further evidence that Younger Dryas cooling may have been a global event.

scholarly journals Calibration of the 14C time scale: towards the complete dating range

2002 ◽  
Vol 81 (1) ◽  
pp. 85-96 ◽  
Author(s):  
J. van der Plicht
Keyword(s):  
Calibration Curve ◽  
Time Scale ◽  
Late Glacial ◽  
Calibration Method ◽  
Laminated Sediments ◽  
Calibration Curves ◽  
Radiocarbon Calibration

AbstractRadiocarbon calibration based on dendro-chronology and U-series dated corals yield a calibration curve (INTCAL98) well into the Late Glacial, back to ca. 15,600 calendar years ago. Beyond this limit, various calibration curves are produced, mainly based on laminated sediments and various carbonates dated by U-series isotopes. Such calibration curves now cover the complete 14C dating range of about 45,000 years, but are not consistent with each other. Each calibration method (other than dendro-chronology) has its own assumptions and pitfalls. Thus far, the calibration curve obtained from Lake Suigetsu laminated sediments is the only terrestrial (atmospheric) one.

Radiocarbon calibration and Late Glacial occupation in northwest Europe

Antiquity ◽  
2000 ◽  
Vol 74 (283) ◽  
pp. 112-119 ◽  
Author(s):  
S. P. E. Blockley ◽  
R. E. Donahue ◽  
A. M. Pollard
Keyword(s):  
Late Glacial ◽  
Radiocarbon Dates ◽  
Northwest Europe ◽  
Radiocarbon Calibration

Various methods of analysing the dating of the late Glacial suggest various interpretations. Here, in answer to a paper from 1997, radiocarbon dates are calibrated and used to reconsider the dating of this contentious period.

scholarly journals Illuminating Intcal During the Younger Dryas

Radiocarbon ◽  
2020 ◽  
Vol 62 (4) ◽  
pp. 883-889 ◽  
Author(s):  
Frederick Reinig ◽  
Adam Sookdeo ◽  
Jan Esper ◽  
Michael Friedrich ◽  
Giulia Guidobaldi ◽  
...  
Keyword(s):  
Environmental Change ◽  
Calibration Curve ◽  
Younger Dryas ◽  
Late Glacial ◽  
Precision Data ◽  
The Past ◽  
Climate And Environmental Change ◽  
Absolute Dating ◽  
High Precision Data ◽  
Geochronological Dating

ABSTRACTAs the worldwide standard for radiocarbon (14C) dating over the past ca. 50,000 years, the International Calibration Curve (IntCal) is continuously improving towards higher resolution and replication. Tree-ring-based 14C measurements provide absolute dating throughout most of the Holocene, although high-precision data are limited for the Younger Dryas interval and farther back in time. Here, we describe the dendrochronological characteristics of 1448 new 14C dates, between ~11,950 and 13,160 cal BP, from 13 pines that were growing in Switzerland. Significantly enhancing the ongoing IntCal update (IntCal20), this Late Glacial (LG) compilation contains more annually precise 14C dates than any other contribution during any other period of time. Thus, our results now provide unique geochronological dating into the Younger Dryas, a pivotal period of climate and environmental change at the transition from LG into Early Holocene conditions.

scholarly journals SHCal13 Southern Hemisphere Calibration, 0–50,000 Years cal BP

Radiocarbon ◽  
2013 ◽  
Vol 55 (4) ◽  
pp. 1889-1903 ◽  
Author(s):  
Alan G Hogg ◽  
Quan Hua ◽  
Paul G Blackwell ◽  
Mu Niu ◽  
Caitlin E Buck ◽  
...  
Keyword(s):  
Southern Hemisphere ◽  
Calibration Curve ◽  
Younger Dryas ◽  
Autoregressive Process ◽  
Measured Data ◽  
Data Sets ◽  
Short Term ◽  
Data Set ◽  
Radiocarbon Calibration

The Southern Hemisphere SHCal04 radiocarbon calibration curve has been updated with the addition of new data sets extending measurements to 2145 cal BP and including the ANSTO Younger Dryas Huon pine data set. Outside the range of measured data, the curve is based upon the ern Hemisphere data sets as presented in IntCal13, with an interhemispheric offset averaging 43 ± 23 yr modeled by an autoregressive process to represent the short-term correlations in the offset.

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