Intérêt relatif des divers types de matériaux pour l'obtention de datations fiables. Nouveaux travaux pour faire reculer la limite d'utilisation du C de 40000ans.
Archaeology ; Biogenic process ; C14 dating ; Carbonate ; Dating ; Fruit ; Microstructure ; Quaternary
The AA. present an extended set of C14 dates on the carbonate fraction of Lithospermum fruits from 4 modern and 11 fossil samples. The data suggest that biogenic carbonate from the fruits of Lithospermum represents suitable material for radiocarbon
Archaeology ; Biogenic process ; C14 dating ; Carbonate ; Dating ; Methodology ; Nebraska ; Quaternary ; United States of America ; Utah
This paper reports on C14 systematics of modern hackberry endocarp carbonate and examine its potential as a C14 dating substrate. C14 dates of fossil endocarp carbonates compared favorably with dates obtained by other means at archaeological
and geological sites ranging in age from the late Pleistocene through the early Holocene. They therefore suggest that hackberry endocarp is a suitable substrate for C14 dating provided that its morphological and mineralogical integrity is preserved.
A magnetostratigraphic comparison between 14C years and varve years during the Late Weichselian indicating significant differences between the time-scales
Datation ; DatationC14 ; Géographie de l'Europe ; Paléomagnétisme ; Stratigraphie ; Suède ; Technique de recherche ; Varve
Statistical correlations between the two independantly dated time-scales suggest that at 10 500-10 200 14C years B. P. the varvechronology exceeds the 14C chronology by the order of 500-600 varve/year. Further correlations between the time-scales
at 12 000 14C years B. P. suggest that the difference between the chronologies increased steadily from 12 000 to 10 000 14C years B. P. If these correlations are correct they imply that the 14C production rate increased steadily during the Late
C14 dating ; California ; Climatic variation ; Dating ; Evaporite ; Lacustrine sediment ; Lake level ; Lateglacial ; Pleistocene ; Pluvial ; Quaternary ; Th/U dating ; United States of America ; Water balance
happened during the transition interval between the last iceberg discharge event Heinrich 1, (14 500 C14 yr B.P.) and the Bølling-Allerød warming (12 800 C14 yr B.P.).
La fiabilité des datations au C14 pour des séquences fini-pléistocènes et les différentes phases de la glaciation wurmienne : l'exemple des Alpes Orientales et leur avant-pays
C14 dating ; Chronostratigraphy ; Europe ; Glaciation ; Interglacial ; Palaeogeography ; Palynology ; Pleistocene ; Wurm
D'importantes divergences existant entre des datations au C14 et un certain nombre d'analyses polliniques pour des séquences du Pléistocène supérieur des Alpes Orientales, les AA. discutent ces datations arès une mise au point terminologique de
A l'aide des datationsC14 et des analyses polliniques, mise en évidence des changements de végétation dans le Bassin Mackenzie au cours du Postglaciaire.
Résultats chronostratigraphiques et de datation au carbone 14 de l'ancien port du nord de Tyr montrant des pratiques de dragage au cours des périodes romaine et byzantine.
Modern floodplain sediments in the Wicklow Mountains display a stratigraphy and sedimentology that contrasts them with earlier Holocene alluvium. This paper presents the results of a C14 dating programme the objects of which were to date : a) more
definitively their commencement throughout the Wicklow Mountains, and b) their internal stratigraphies with a view to establishing a flood chronology. Although the results show that the immediate research aims cannot be achieved using C14 dating they have lead
C14 dating ; Dating ; Holocene ; Palaeogeography ; Peat ; Sweden ; Wood
trunk in the sandur of the stream St Göljån was radiocarbon dated to 1320 C14 years B.P. The lowermost part of a peat sequence in a soligenous mire in the valley of the stream Tangån was radiocarbon dated to 1455 C14 years.
A l'aide d'études microscopiques et géochimiques, mises en évidence dans les tourbes de trois couches de cendres volcaniques. Par les datations au C14 des échantillons de tourbe, corrélation avec des événements volcaniques connus. L'A. présente