scholarly journals Marine Turtle Bones from an Archaeological Site in Polynesia Yield Reliable Age Determinations

Radiocarbon ◽  
1990 ◽  
Vol 32 (2) ◽  
pp. 143-147 ◽  
Author(s):  
T S Dye
Keyword(s):  
Mass Spectrometry ◽  
Sample Size ◽  
Accelerator Mass Spectrometry ◽  
South Pacific ◽  
Archaeological Site ◽  
Marine Turtle ◽  
Long Distance ◽  
Marine Turtles ◽  
Ams Dating ◽  
Age Determinations

Accelerator mass spectrometry dating of three 50g samples of marine turtle bone from the basal cultural stratum of the Tongoleleka archaeological site, Lifuka Island, Kingdom of Tonga, South Pacific yields results that agree with conventional 14C dates on marine shell. A method for calibrating these dates that takes into account the long distance migrations of marine turtles in the South Pacific is proposed. A sample size greater than 50g is recommended for routine AMS dating of marine turtle bone.

RADIOCARBON DATING APPLIED TO PREHISPANIC TERRITORIAL DYNAMICS AT EL MAYE, IXMIQUILPAN, HIDALGO, MEXICO

Radiocarbon ◽  
2020 ◽  
Vol 62 (6) ◽  
pp. 1723-1731
Author(s):  
Alberto Alcántara ◽  
Corina Solís ◽  
Fernando López Aguilar ◽  
María Rodríguez-Ceja ◽  
Víctor Hugo Anaya Linares ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Local Government ◽  
Accelerator Mass Spectrometry ◽  
Radiocarbon Dating ◽  
Collaborative Study ◽  
Archaeological Site ◽  
Postclassic Period ◽  
Residential Units ◽  
Late Postclassic ◽  
Ams Dating

ABSTRACTEl Maye is a community located in the municipality of Ixmiquilpan, Hidalgo, in the central region of Mexico. During the late Postclassic period (1350–1521 AD), the Aztecs controlled the area through the establishment of a dual-headed system, one part belonging to the Aztec government and the other to the local government. El Maye was the local government center for the Ixmiquilpan territory under the Aztec domain. The residential units of El Maye archaeological site were constructed in 6 different occupational phases, with the presence of large rooms, stucco floors and walls, offerings, and a variety of ceramics belonging to the late Aztec III ceramic period (1400–1520 AD). The Axis Project of the Mezquital Valley (PEVM-ENAH) and the Accelerator Mass Spectrometry Laboratory (LEMA-UNAM) have undertaken a collaborative study of the El Maye site by performing absolute radiocarbon accelerator mass spectrometry (14C AMS) dating. For a better understanding of the emergence and development of El Maye, a series of AMS 14C dates of charcoal and bone samples recovered from different stratigraphic levels, was performed. This allowed us to locate the occupation of the site between 1320 and 1625 cal AD.

scholarly journals Application of 14C AMS Dating to the Chronology of Holocene Glacier Fluctuations in the High Arctic, With Special Reference to Leffert Glacier, Ellesmere Island, Canada

Radiocarbon ◽  
1989 ◽  
Vol 31 (03) ◽  
pp. 570-578 ◽  
Author(s):  
Weston Blake
Keyword(s):  
Mass Spectrometry ◽  
Accelerator Mass Spectrometry ◽  
High Arctic ◽  
Ellesmere Island ◽  
Present Position ◽  
Outlet Glacier ◽  
Radiocarbon Age ◽  
Ams Dating ◽  
Climatic Cooling ◽  
Age Determinations

A series of radiocarbon age determinations obtained by Accelerator Mass Spectrometry (AMS) shows that the front of Leffert Glacier, a major outlet glacier from the Prince of Wales Icefield, Ellesmere Island, was 18+ km behind (west of) its present position for a period of at least 1500 radiocarbon years. A subsequent readvance occurred close to 2000 radiocarbon years ago, as a consequence of the climatic cooling that followed the warm Hypsithermal Interval. A number of other glaciers in the region appear to have behaved in similar fashion.

Reconstructing the Chronology of the House XVII-XVIII Complex at Umm el-Jimal, East Jordan: Radiocarbon Dates of Organic Inclusions of Architectural Mortars

Radiocarbon ◽  
2014 ◽  
Vol 56 (1) ◽  
pp. 245-256 ◽  
Author(s):  
Khaled Al-Bashaireh
Keyword(s):  
Mass Spectrometry ◽  
Accelerator Mass Spectrometry ◽  
Archaeological Site ◽  
Housing Demand ◽  
Radiocarbon Dates ◽  
Archaeological Data ◽  
Lime Mortars ◽  
Byzantine Period

This article presents accelerator mass spectrometry (AMS) radiocarbon dates of organic inclusions of cement materials from the House XVII-XVIII Complex located in the Umm el-Jimal archaeological site, east Jordan, aiming at refining the unclear chronology of the house. Fine straws and small fragments of charcoal uncovered from preserved architectural lime mortars and plasters were dated without carrying out extensive excavations. The results indicate that the house most probably was initially plastered or built during the middle of the Byzantine period. The results agree with the historical and archaeological data indicating that Umm el-Jimal flourished during this period; therefore, it is probable that the house was established during this time to meet the housing demand for the increased number of its population.

scholarly journals Cazadores recolectores tempranos, supervivencia de fauna del pleistoceno (equus sp. y glyptodon sp.) y tecnologia lítica durante el holoceno temprano en la frontera Uruguay-Brasil

2010 ◽  
Vol 23 (2) ◽  
pp. 20-39 ◽  
Author(s):  
Rafael Suárez ◽  
Guaciara M. Santos
Keyword(s):  
Climate Change ◽  
Mass Spectrometry ◽  
South America ◽  
Accelerator Mass Spectrometry ◽  
Lithic Technology ◽  
Archaeological Site ◽  
Human Adaptation ◽  
14C Age ◽  
Lithic Artifacts ◽  
In The Beginning

On this paper we show records of Pleistocene fauna from the archaeological site of PayPaso 1, located near of the Quarai River. On this site we recovered two extinct species, Equus sp. (ancient horse) e Glyptodon sp. (giant armadillo), direct associated with lithic artifacts. Our results indicate that these extinct mammals lived in the beginning of the Holocene (9,600 – 9,100 years 14C BP), based on nine 14C age results obtained by AMS (Accelerator Mass Spectrometry) measurements. In this work, these results are compared with others in South America. Human adaptation, lithic technology, Pleistocene fauna extinction and climate change at the transition between Pleistocene-Holocene are also discussed.

Misunderstandings Concerning the Significance of AMS Background 14C Measurements

Radiocarbon ◽  
2018 ◽  
Vol 60 (3) ◽  
pp. 727-749
Author(s):  
R E Taylor ◽  
John R Southon ◽  
Guaciara M Santos
Keyword(s):  
Mass Spectrometry ◽  
Accelerator Mass Spectrometry ◽  
Time Scale ◽  
Point Of View ◽  
General Validity ◽  
General Audience ◽  
Background Levels ◽  
Age Determinations

ABSTRACTWe consider one misconception of those who currently reject the general validity of radiocarbon (14C) age determinations older than, at most, 10,000 BP. There is an allegation that the presence of 14C reported by accelerator mass spectrometry (AMS) laboratories in their measurements of 14C infinite age (>100,000 years) organics used to define background levels, support their point of view. This article has been written for a general audience, primarily for those who have questions about the validity of these arguments. However, they may not be familiar with the literature relevant to providing a clear response to the claims of these individuals. We conclude that, in our view, of all of the possible explanations for the reports of the presence of 14C in these background samples, the least probable explanation has been advanced by those rejecting the validity of the 14C time scale in excess of, at most, 10,000 BP.

scholarly journals Reliability of Bone Gelatin AMS Dating: Rattus Exulans and Marine Shell Radiocarbon Dates from Pauatahanui Midden Sites in Wellington, New Zealand

Radiocarbon ◽  
1999 ◽  
Vol 41 (2) ◽  
pp. 119-126 ◽  
Author(s):  
Nancy Beavan Athfield ◽  
Bruce McFadgen ◽  
Rodger Sparks
Keyword(s):  
Mass Spectrometry ◽  
New Zealand ◽  
Beta Decay ◽  
Confidence Level ◽  
Accelerator Mass Spectrometry ◽  
Radiocarbon Dates ◽  
Austrovenus Stutchburyi ◽  
Ams Dating ◽  
Marine Shell

A suite of 6 bone gelatin accelerator mass spectrometry (AMS) radiocarbon dates for Rattus exulans Peale and associated beta decay 14C dates for Austrovenus stutchburyi shell are presented for 4 middens at Pauatahanui, Wellington, New Zealand. Mean calibrated age ranges of Rattus exulans (520–435 BP and 350–330 BP at 95% confidence level) and shell (465–375 BP at 95% confidence level) from the 4 midden sites overlap. The agreement between Rattus exulans bone gelatin dates and associated shell provides an inter-sample comparison of 14C dating using both gas counting (beta decay) and AMS dating techniques. We examine the adequacy of the standard gelatinization treatment for bone samples, which has been employed consistently at the laboratory since 1995.

scholarly journals A Protocol for Radiocarbon Dating Tropical Subfossil Cave Guano

Radiocarbon ◽  
2009 ◽  
Vol 51 (3) ◽  
pp. 977-986 ◽  
Author(s):  
Christopher M Wurster ◽  
Michael I Bird ◽  
Ian Bull ◽  
Charlotte Bryant ◽  
Philippa Ascough
Keyword(s):  
Mass Spectrometry ◽  
Southeast Asia ◽  
Accelerator Mass Spectrometry ◽  
Radiocarbon Dating ◽  
Saturated Hydrocarbon ◽  
Lipid Fraction ◽  
Bulk Sample ◽  
Radiocarbon Dates ◽  
Organic Fractions ◽  
Age Determinations

We present accelerator mass spectrometry (AMS) radiocarbon dates on several organic fractions isolated from tropical guano deposits recovered from insular Southeast Asia. Differences were observed between 14C measurements made on bulk guano as well as bulk lipids, the saturated hydrocarbon fraction, solvent-extracted guano, and insect cuticles extracted from the same bulk sample. We infer that 14C dates from the bulk lipid fraction and saturated hydrocarbon fractions can be variably contaminated by exogenous carbon. In contrast, 14C measurements on solvent-extracted guano and isolated insect cuticles appear to yield the most robust age determinations.

scholarly journals Radiocarbon in 9th to 5th Century BC Tree-Ring Samples from the Ouban 1 Archaeological Site, Hiroshima, Japan

Radiocarbon ◽  
2007 ◽  
Vol 49 (2) ◽  
pp. 473-479 ◽  
Author(s):  
Hiromasa Ozaki ◽  
Mineo Imamura ◽  
Hiroyuki Matsuzaki ◽  
Takumi Mitsutani
Keyword(s):  
Mass Spectrometry ◽  
Tree Ring ◽  
Calibration Curve ◽  
Accelerator Mass Spectrometry ◽  
Wood Sample ◽  
Archaeological Site ◽  
Short Term ◽  
Statistical Errors ◽  
Term Fluctuation

In order to investigate the regional atmospheric radiocarbon offset, accelerator mass spectrometry (AMS) 14C measurements were made on 5-yr increments of a Japanese wood sample dendrochronologically dated to 820–436 BC. The 14C data from the Japanese tree-ring samples were compared with the IntCal04 calibration curve (Reimer et al. 2004). In most parts, the differences between IntCal04 and 14C dates in the Japanese tree-ring samples were within experimental statistical errors. At around 680 BC, however, significant differences of up to 100 14C yr were observed. These differences may indicate either regional offsets in Japan or the short-term fluctuation of a subdecadal timescale in atmospheric 14C variations.

scholarly journals Examination of Background Contamination Levels for Gas Counting and AMS Target Preparation in Trondheim

Radiocarbon ◽  
1992 ◽  
Vol 34 (3) ◽  
pp. 312-317 ◽  
Author(s):  
Steinar Gulliksen ◽  
Mette S. Thomsen
Keyword(s):  
Crystal Structure ◽  
Mass Spectrometry ◽  
Accelerator Mass Spectrometry ◽  
Target Preparation ◽  
Very Old ◽  
Ams Dating ◽  
Contamination Levels ◽  
Lower Background

The Radiological Dating Laboratory in Trondheim relatively often dates samples with ages >30 ka BP. Contaminated background materials are known to affect the accuracy of very old dates. We have found, by measurements of different materials, that such contamination is small when using our conventional gas proportional counting (GPC) system. We have also studied contamination levels of our target preparation for 14C accelerator mass spectrometry (AMS) dating in Uppsala. A significant lower background is obtained for Icelandic double spar than for marbles, probably due to a crystal structure of the double spar that is more insensitive to contaminating processes. The background for combusted samples is at the same level as for samples of double spar, indicating that additional 14C contamination due to combustion is negligible. Dates obtained on interstadial samples (T >30 ka bp) by both GPC and AMS agree well.

scholarly journals Building the Radiocarbon Chronology for the Archaeological Site Ufa-II, Bashkortostan, Russia: Is this the Elusive “Bashkort” of Medieval Sources?

Radiocarbon ◽  
2013 ◽  
Vol 55 (3) ◽  
pp. 1278-1285
Author(s):  
Vladimir A Levchenko ◽  
Flarit A Sungatov
Keyword(s):  
Mass Spectrometry ◽  
Accelerator Mass Spectrometry ◽  
Archaeological Site ◽  
Radiocarbon Dates ◽  
Site Occupation ◽  
Radiocarbon Chronology ◽  
First Time ◽  
Good Agreement

A suite of accelerator mass spectrometry (AMS) radiocarbon dates for the Ufa-II archaeological site in Bashkortostan, Russia, is obtained for the first time. Dating was done on charcoal samples from a sequence of cultural deposits collected during the 2011 digging season. An age-depth chronology is established using the Bayesian deposition General Outlier P_Sequence model. The oldest age for the site at the horizon immediately over the sterile ground was cal AD 137–237 (68% probability), corresponding to the beginning of site occupation. The youngest 14C date found was late 6th to early 7th century cal AD for the extensive planked boardwalks unearthed at the site. The 14C dates are in good agreement with archaeological determinations based on discovered artifacts.

Sign in / Sign up

Export Citation Format

Share Document