scholarly journals Copenhagen Radiocarbon Dates X

Radiocarbon ◽  
1973 ◽  
Vol 15 (1) ◽  
pp. 86-112 ◽  
Author(s):  
Henrik Tauber
Keyword(s):  
Radiocarbon Dates ◽  
Geologic Samples ◽  
Radiocarbon Chronology

The following list comprises a selected number of measurements made on archaeologic samples from 1959 to December 1971. Measurements of geologic samples will be given in a later date list. A survey of the radiocarbon chronology for the Danish Mesolithic and Neolithic, ensuing from these and previously published dates from the laboratory, has recently been compiled (Tauber, 1972).

scholarly journals Direct dating reveals the early history of opium poppy in western Europe

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Aurélie Salavert ◽  
Antoine Zazzo ◽  
Lucie Martin ◽  
Ferran Antolín ◽  
Caroline Gauthier ◽  
...  
Keyword(s):  
Western Europe ◽  
Western Alps ◽  
Western Mediterranean ◽  
Opium Poppy ◽  
Radiocarbon Dates ◽  
Macrobotanical Remains ◽  
History Of ◽  
Temperate Europe ◽  
Radiocarbon Chronology ◽  
Botanical Remains

AbstractThis paper aims to define the first chrono-cultural framework on the domestication and early diffusion of the opium poppy using small-sized botanical remains from archaeological sites, opening the way to directly date minute short-lived botanical samples. We produced the initial set of radiocarbon dates directly from the opium poppy remains of eleven Neolithic sites (5900–3500 cal BCE) in the central and western Mediterranean, northwestern temperate Europe, and the western Alps. When possible, we also dated the macrobotanical remains originating from the same sediment sample. In total, 22 samples were taken into account, including 12 dates directly obtained from opium poppy remains. The radiocarbon chronology ranges from 5622 to 4050 cal BCE. The results show that opium poppy is present from at least the middle of the sixth millennium in the Mediterranean, where it possibly grew naturally and was cultivated by pioneer Neolithic communities. Its dispersal outside of its native area was early, being found west of the Rhine in 5300–5200 cal BCE. It was introduced to the western Alps around 5000–4800 cal BCE, becoming widespread from the second half of the fifth millennium. This research evidences different rhythms in the introduction of opium poppy in western Europe.

scholarly journals Radiocarbon Chronology of Late Neolithic Settlements in the Tisza-Maros Region, Hungary

Radiocarbon ◽  
1992 ◽  
Vol 34 (3) ◽  
pp. 859-866 ◽  
Author(s):  
Ede Hertelendi ◽  
Ferenc Horváth
Keyword(s):  
Late Neolithic ◽  
Unique Type ◽  
Radiocarbon Dates ◽  
Radiocarbon Data ◽  
Stratigraphic Position ◽  
European Neolithic ◽  
Radiocarbon Chronology ◽  
Developmental Phases

We investigated chronological questions of five Late Neolithic settlements in the Hungarian Tisza-Maros region. Fifty new radiocarbon dates provide an internal chronology for the developmental phases of the tell settlements, and place them into the wider framework of the southeastern European Neolithic. An example is presented of how a unique type of stratigraphic excavation helps the interpretation of radiocarbon data, which are in contradiction with the stratigraphic position of the samples.

scholarly journals Simon Fraser University Radiocarbon Dates III

Radiocarbon ◽  
1984 ◽  
Vol 26 (3) ◽  
pp. 431-440 ◽  
Author(s):  
K A Hobson ◽  
D E Nelson
Keyword(s):  
Sample Preparation ◽  
Combustion Tube ◽  
Distilled Water ◽  
Radiocarbon Dates ◽  
Dry Ice ◽  
Combustion Gases ◽  
Geologic Samples ◽  
Tube Assembly ◽  
Simon Fraser University ◽  
Preparation Techniques

This list reports measurements made on archaeologic and geologic samples by our laboratory from June 1982 to December 1983. Results of measurements made during that period which lack review by submitters will be reported in a subsequent date list. Sample preparation techniques and benzene synthesis remain as described previously (R, 1982, v 24, p 344–351). For low organic samples, such as sediments, we now use a combustion tube assembly. These samples are burned under oxygen flow in a quartz tube. To absorb sulfur and break up nitrous compounds, we pass combustion gases through a 50% mixture of MnO2 and CuO wire heated to ca 500°C. The gas is then bubbled through a distilled water and KMnO4 solution to remove chlorides before being introduced into our standard dry ice and CO2 traps.

scholarly journals University of Miami Radiocarbon Dates VII

Radiocarbon ◽  
1976 ◽  
Vol 18 (3) ◽  
pp. 371-375 ◽  
Author(s):  
J J Stipp ◽  
K L Eldridge ◽  
K Valenziano
Keyword(s):  
Standard Deviation ◽  
Liquid Scintillation Counting ◽  
Liquid Scintillation ◽  
Scintillation Counting ◽  
Shell Material ◽  
Soft Or ◽  
Radiocarbon Dates ◽  
Powdery Material ◽  
Partial List ◽  
Geologic Samples

The following radiocarbon measurements are a partial list of geologic samples from S Florida dated during the summer of 1975. The technique used is liquid scintillation counting of wholly synthesized benzene as indicated in R, v 16, p 402-408 and R, v 18, p 210-220. Dates are calculated using a 14C half-life of 5568 yr and errors are reported as one standard deviation. Before conversion, shell material was etched with HCl to remove all soft or powdery material. All wood and peat samples were treated with NaOH.

scholarly journals Groningen Radiocarbon Dates VIII

Radiocarbon ◽  
1969 ◽  
Vol 11 (2) ◽  
pp. 351-390 ◽  
Author(s):  
J. C. Vogel ◽  
J. C. Lerman
Keyword(s):  
Latin America ◽  
Radiocarbon Dates ◽  
The Past ◽  
Pollen Diagrams ◽  
Geologic Samples

This list contains dates for Latin America which have mainly been measured during the past few years. The results are grouped into three categories: geologic, archaeologic, and geophysical, and arranged according to the country of provenance, passing roughly from N to S. Most of the geologic samples are connected with palynologic studies. In cases where the influence of man is apparent in the pollen diagrams, this is explicitly mentioned. Descriptions and comments are based on information provided by the collectors or submitters and on the publications referred to under each sample or series. For the archaeologic section reference has also been made to the general works of Meggers and Evans (1963), Jennings and Norbeck (1964), and Willey (1966).

scholarly journals University of Pennsylvania Radiocarbon Dates XXII

Radiocarbon ◽  
1984 ◽  
Vol 26 (2) ◽  
pp. 212-240 ◽  
Author(s):  
Barbara J Hurst ◽  
Barbara Lawn
Keyword(s):  
Humic Acid ◽  
University Of Pennsylvania ◽  
Radiocarbon Dates ◽  
Sample Information ◽  
Geologic Samples

This date list includes most of the archaeologic and geologic samples dated in this laboratory since publication of our last date list (R, 1981, v 23, p 227–240), as well as some samples dated previously which lacked adequate sample information.All samples were pretreated with 3N HCl and some, where noted, were given additional pretreatment with 2% NaOH for the removal of possible humic acid contaminants.

scholarly journals University of Miami Radiocarbon Dates IX

Radiocarbon ◽  
1977 ◽  
Vol 19 (2) ◽  
pp. 326-331 ◽  
Author(s):  
D Piepgras ◽  
J J Stipp
Keyword(s):  
Standard Deviation ◽  
Half Life ◽  
Radiocarbon Dates ◽  
Partial List ◽  
Geologic Samples ◽  
University Of Miami ◽  
Modern Standard

The following radiocarbon measurements are a partial list of geologic samples dated since September 1975. The technique used is described in R, v 18, p 210-220. Dates are calculated using a 14C half-life of 5568 yr and errors are reported as one standard deviation. This includes only the counting errors on the sample, background and modern standard.

scholarly journals University of Pennsylvania Radiocarbon Dates XV

Radiocarbon ◽  
1973 ◽  
Vol 15 (2) ◽  
pp. 367-381 ◽  
Author(s):  
Barbara Lawn
Keyword(s):  
Humic Acid ◽  
19Th Century ◽  
Half Life ◽  
University Of Pennsylvania ◽  
Radiocarbon Dates ◽  
Sample Information ◽  
Time Period ◽  
Geologic Samples

This date list includes most of the archaeologic and geologic samples dated in this laboratory since publication of our last date list (R., v. 12, p. 577–589), as well as some samples which had previously been dated, but lacked the sample information necessary for publication. Known-age samples, completed in this time period, will be reported elsewhere. The b.p. ages are based upon a.d. 1950, and have been calculated with the half-life value of 5568 yr. All samples were counted at least twice for periods of not less than 1000 minutes each. Errors quoted for each sample are derived from the measurement of the sample, the background, and of several counts of our mid-19th century standard oak sample, but do not include the half-life error. All samples were pretreated with 3N HCl, and some, where noted, were given additional pretreatment with 2% NaOH for the removal of possible humic acid contaminants.

Never Say Never Again: Some Thoughts on Could Haves and Might Have Beens

1992 ◽  
Vol 57 (2) ◽  
pp. 327-331 ◽  
Author(s):  
J. M. Adovasio ◽  
J. Donahue ◽  
R. Stuckenrath
Keyword(s):  
Radiocarbon Dates ◽  
Radiocarbon Chronology ◽  
By Products

Tankersley and Munson (1992) reiterate that the early and, perhaps, some of the later Meadowcroft Rockshelter radiocarbon dates may be contaminated by anthropogenically derived coal or dissolved coal by-products. Their allegations are assessed in light of available data and rejected. Presently, there is no evidence whatsoever for particulate or nonparticulate contamination of any part of the Meadowcroft Rockshelter radiocarbon chronology.

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.

Sign in / Sign up

Export Citation Format

Share Document