C/C ratios of Pleistocene mummified remains from Beringia
Amérique du Nord ; Arctique ; Asie ; Beringia ; Géographie physique ; Paléo-environnement ; Paléo-écologie ; Pléistocène supérieur ; Quaternaire zones froides ; Rapport C/C
exclusively on C plants, and that C grasses were not differentially ingested by bison, as previously suggested. Paleoclimatic constraints probably prevented the formation of a warm season (C) guild during the later part of the growing season in the steppes
Interprétation de l'analyse isotopique (0/0, C/C) des foraminifères et des diatomées des sédiments quaternaires. in Paléoclimats. (Interpretation of the isotopic analysis (0/0, C/C) of foraminifera and diatoms from Quaternary sediments)
Quatre articles. 1. Régions portuaires et mondialisation (C. Ducruet). 2. Les territoires du port. Le cluster portuaire et logistique génois (H. Ghiara, C. Sillig). 3. Venise 2020, plateforme logistique (P. Favaretto). 4. Les ports frontières de
Trieste, Koper et Rijeka, futurs débouchés pour les conteneurs d'Europe centrale (A. Beyer, J.-C. Sevin).
Archaeology ; Biogenic process ; C 14 dating ; Carbonate ; Dating ; Methodology ; Nebraska ; Quaternary ; United States of America ; Utah
This paper reports on C 14 systematics of modern hackberry endocarp carbonate and examine its potential as a C 14 dating substrate. C 14 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 C 14 dating provided that its morphological and mineralogical integrity is preserved.
Declining trend in the C 13/C 12 ratio of atmospheric carbon dioxide from tree rings of South African Widdringtonia cedarbergensis
This paper reports the first high-resolution (annual) C 13/C 12 chronology for both Africa and the Southern Hemisphere. The 77-yr stable carbon isotope chronology was developed from 6 Widdringtonia cedarbergensis trees from a site in the Cedarberg
Mountains, Western Cape Province, South Africa. The results indicate that C 13/C 12 ratios are not different from 1900 to 1949. After 1949, however, values become significantly more negative to 1977. This decline can be related to the anthropogenic impact