Progress in refining the global radiocarbon calibration curve using New Zealand kauri (Agathis australis) tree-ring series from Oxygen Isotope Stage 3

2015 ◽  
Vol 27 ◽  
pp. 158-163 ◽  
Author(s):  
J.G. Palmer ◽  
C.S.M. Turney ◽  
A.G. Hogg ◽  
A.M. Lorrey ◽  
R.J. Jones
Keyword(s):  
New Zealand ◽  
Oxygen Isotope ◽  
Tree Ring ◽  
Calibration Curve ◽  
Oxygen Isotope Stage ◽  
Radiocarbon Calibration

scholarly journals Extension of New Zealand kauri (Agathis australis) tree-ring chronologies into Oxygen Isotope Stage (OIS) 3

2006 ◽  
Vol 21 (7) ◽  
pp. 779-787 ◽  
Author(s):  
Jonathan Palmer ◽  
Andrew Lorrey ◽  
Chris S. M. Turney ◽  
Alan Hogg ◽  
Mike Baillie ◽  
...  
Keyword(s):  
New Zealand ◽  
Oxygen Isotope ◽  
Tree Ring ◽  
Oxygen Isotope Stage

scholarly journals Towards a Radiocarbon Calibration for Oxygen Isotope Stage 3 Using New Zealand Kauri (Agathis Australis)

Radiocarbon ◽  
2007 ◽  
Vol 49 (2) ◽  
pp. 447-457 ◽  
Author(s):  
Chris S M Turney ◽  
L Keith Fifield ◽  
Jonathan G Palmer ◽  
Alan G Hogg ◽  
Mike G L Baillie ◽  
...  
Keyword(s):  
New Zealand ◽  
Calibration Curve ◽  
Considerable Effort ◽  
Calendar Time ◽  
Oxygen Isotope Stage ◽  
Absolute Measure ◽  
Dating Method ◽  
Archaeological Models ◽  
Subfossil Wood ◽  
Radiocarbon Calibration

It is well known that radiocarbon years do not directly equate to calendar time. As a result, considerable effort has been devoted to generating a decadally resolved calibration curve for the Holocene and latter part of the last termination. A calibration curve that can be unambiguously attributed to changes in atmospheric 14C content has not, however, been generated beyond 26 kyr cal BP, despite the urgent need to rigorously test climatic, environmental, and archaeological models. Here, we discuss the potential of New Zealand kauri (Agathis australis) to define the structure of the 14C calibration curve using annually resolved tree rings and thereby provide an absolute measure of atmospheric 14C. We report bidecadally sampled 14C measurements obtained from a floating 1050-yr chronology, demonstrating repeatable 14C measurements near the present limits of the dating method. The results indicate that considerable scope exists for a high-resolution 14C calibration curve back through OIS-3 using subfossil wood from this source.

Palynology of Oxygen Isotope Stage 6 and Substage 5e from the Cover Beds of a Marine Terrace, Taranaki, New Zealand

1990 ◽  
Vol 34 (1) ◽  
pp. 86-100 ◽  
Author(s):  
M. Royd Bussell
Keyword(s):  
New Zealand ◽  
Oxygen Isotope ◽  
Major Change ◽  
Oxygen Isotope Stage ◽  
Long Period ◽  
Marine Terraces ◽  
Tree Ferns ◽  
Glacial Stage ◽  
Marine Platform ◽  
Organic Deposits

AbstractCover beds on uplifted Quaternary marine terraces in the Taranaki-Wanganui area of New Zealand include organic deposits which yield abundant pollen. In the west at Ohawe, marine shore platform deposits are overlain by laterally extensive lignites and laharic breccia, interbedded with alluvium and capped by tephra-rich loess. Following a time of presumably interglacial marine deposition on the platform, a long period of glacial climate is suggested by pollen floras dominated by grass and shrubland taxa. Trees were sparse, but the abundance of podocarps, Nothofagus, and tree ferns increased during at least one interval, suggesting minor climatic amelioration. Near the top of the section, a major change in regional vegetation is recorded by a dominance of pollen derived from podocarp-hardwood forest taxa, including Ascarina, interpreted as indicating a fully interglacial climate. The marine platform, previously assigned to oxygen isotope substage 5e, is now placed in stage 7. The overlying deposits were deposited during glacial stage 6, while interglacial substage 5e is recorded by sediment and pollen assemblages near the top of the section.

Revised ‘absolute’ dating of the early Mesolithic site of Star Carr, North Yorkshire, in the light of changes in the early Holocene tree-ring chronology

Antiquity ◽  
2000 ◽  
Vol 74 (284) ◽  
pp. 304-307 ◽  
Author(s):  
Petra Dark
Keyword(s):  
Environmental Change ◽  
Tree Ring ◽  
Calibration Curve ◽  
Early Holocene ◽  
Tree Ring Chronology ◽  
Absolute Dating ◽  
The Absolute ◽  
Holocene Environmental Change ◽  
Radiocarbon Calibration

Recent revision of the radiocarbon calibration curve for the early Holocene has implications for the ‘absolute’ date of Mesolithic sites such as Star Carr, and for their relationship to the timescale of early Holocene environmental change.

scholarly journals Radiocarbon Calibration for Japanese Wood Samples

Radiocarbon ◽  
2003 ◽  
Vol 45 (1) ◽  
pp. 81-89 ◽  
Author(s):  
Minoru Sakamoto ◽  
Mineo Imamura ◽  
Johannes Van der Plicht ◽  
Takumi Mitsutani ◽  
Makoto Sahara
Keyword(s):  
Mass Spectrometry ◽  
North America ◽  
Tree Ring ◽  
Calibration Curve ◽  
Accelerator Mass Spectrometry ◽  
The Difference ◽  
Radiocarbon Calibration

The radiocarbon content of Japanese cedars was measured by accelerator mass spectrometry for decadal tree-ring samples from the period of 240 BC to AD 900. Conventional gas counting was also used for part of the samples. The data were compared with the INTCAL98 calibration curve (Stuiver et al. 1998). The results indicate that the difference in atmospheric 14C between Japan and North America or Europe is negligible at this period, less than 18 14C yr using an average of 50 yr. However, in the period of about AD 100 to about AD 200, we cannot exclude the possibility of a deviation of the order of 30 to 40 14C yr to the older ages.

Climate and Sea Level During Oxygen Isotope Stage 7b: On-Land Evidence from New Zealand

1988 ◽  
Vol 29 (2) ◽  
pp. 176-185 ◽  
Author(s):  
Brad Pillans ◽  
Geoff Holgate ◽  
Matt McGlone
Keyword(s):  
New Zealand ◽  
Oxygen Isotope ◽  
Sea Level ◽  
Northern Hemisphere ◽  
Pollen Analysis ◽  
Deep Sea ◽  
Sea Level Changes ◽  
Oxygen Isotope Stage ◽  
Oxygen Isotopic ◽  
And Sea Level

Strata at Landguard Bluff, near Wanganui, New Zealand preserve a clear record of relative sea-level changes during oxygen-isotope stage 7. Two relative high sea-level stands (during stages 7a about 210,000 yr ago and 7c about 240,000 yr ago) are separated by a relative low sea level (stage 7b) that was at least 32 m lower than present. Pollen analysis of sediment deposited during stage 7b indicates climate at the time was up to 3°C cooler than present. The climate and sea-level evidence from Landguard Bluff are consistent with oxygen-isotopic evidence from deep-sea cores indicating a marked cooling during stage 7, which is closely associated with a summer radiation minimum centered at about 230,000 yr ago in the Northern Hemisphere.

scholarly journals 14C Calibration in the Southern Hemisphere and the Date of the Last Taupo Eruption: Evidence from Tree-Ring Sequences

Radiocarbon ◽  
1995 ◽  
Vol 37 (2) ◽  
pp. 155-163 ◽  
Author(s):  
R. J. Sparks ◽  
W. H. Melhuish ◽  
J.W. A. McKee ◽  
John Ogden ◽  
J. G. Palmer ◽  
...  
Keyword(s):  
New Zealand ◽  
Southern Hemisphere ◽  
Northern Hemisphere ◽  
Tree Ring ◽  
Tree Rings ◽  
Calibration Curve ◽  
Systematic Difference ◽  
Calibration Data ◽  
Northern And Southern Hemispheres

Tree rings from a section of Prumnopitys taxifolia (matai) covering the period ad 1335–1745 have been radiocarbon dated and used to generate a 14C calibration curve for southern hemisphere wood. Comparison of this curve with calibration data for northern hemisphere wood does not show a systematic difference between 14C ages measured in the northern and southern hemispheres. A floating chronology covering 270 yr and terminating at the last Taupo (New Zealand) eruption, derived from a sequence of 10-yr samples of tree rings from Phyllocladus trichomanoides (celery pine, or tanekaha), is also consistent with the absence of a systematic north-south difference, and together with the matai data, fixes the date of the Taupo eruption at ad 232 ± 15.

scholarly journals Radiocarbon Calibration Curve Variations and Their Implications for the Interpretation of New Zealand Prehistory

Radiocarbon ◽  
1994 ◽  
Vol 36 (2) ◽  
pp. 221-236 ◽  
Author(s):  
B.G. McFadgen ◽  
F. B. Knox ◽  
T. R. L. Cole
Keyword(s):  
British Columbia ◽  
New Zealand ◽  
Population Growth ◽  
Calibration Curve ◽  
South Australia ◽  
Spreading Effect ◽  
Positive Correlation ◽  
Initial Settlement ◽  
Stochastic Distribution ◽  
Radiocarbon Calibration

The shape of a distribution of calibrated 14C dates displays spurious peaks and troughs, brought about by changes in the slope of the calibration curve interacting with the spreading effect of the stochastic distribution of counting errors. The distortion results in a positive correlation between the numbers of dates per calendar year and the slopes of the calibration curves, for assemblages of archaeological dates from such widely separated areas as British Columbia, South Australia and New Zealand. The distortion also increases the possibility of date reversals, and increases the overall spread of calibrated 14C dates. After taking into account this systematic distortion and inbuilt age of charcoal and wood samples, we estimate dates for the initial settlement and first appearance of fortifications, and infer a likely trend of population growth for prehistoric New Zealand.

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