Results 11 to 20 of about 158,813 (385)
Marine20—The Marine Radiocarbon Age Calibration Curve (0–55,000 cal BP)
Radiocarbon: An International Journal of Cosmogenic Isotope Research, 2020 The concentration of radiocarbon (14C) differs between ocean and atmosphere. Radiocarbon determinations from samples which obtained their 14C in the marine environment therefore need a marine-specific calibration curve and cannot be calibrated directly ...
T. Heaton +15 more
semanticscholar +1 more source
p3k14c, a synthetic global database of archaeological radiocarbon dates
Scientific Data, 2022 Archaeologists increasingly use large radiocarbon databases to model prehistoric human demography (also termed paleo-demography). Numerous independent projects, funded over the past decade, have assembled such databases from multiple regions of the world.
Darcy Bird +19 more
semanticscholar +1 more source
Belfast Radiocarbon Dates VI [PDF]
Radiocarbon, 1970 The dating equipment and operating conditions remain essentially as previously described. This list includes some small samples counted at a filling pressure equivalent to 76cm Hg. at 20°C. Carbon isotope ratios were obtained and calculated as described (R., 1973, v. 15, p. 212). All samples are from Ireland.
A. G. Smith +2 more
openaire +7 more sources
Frontiers in Ecology and Evolution, 2023 The stable isotopes composition of chemolithoautotrophic cave ecosystems is known to differ from epigenic caves. Here we show that in addition, dead carbon (devoid of 14C), is utilized and transferred throughout this ecosystem, rendering it unsuitable ...
Amos Frumkin +3 more
doaj +1 more source
Geoarchaeological Analyses of a Late-Copper-Age Kurgan on the Great Hungarian Plain
Quaternary, 2022 Kurgans are the custodians of outstanding archaeological, natural and environmental-historical value in the lowland landscape of Eastern Europe, which has been continuously transformed over millennia by agricultural activity.
Péter Cseh +3 more
doaj +1 more source
An Improved Method for Extracting, Sorting, and AMS Dating of Pollen Concentrates From Lake Sediment
Frontiers in Ecology and Evolution, 2021 High-resolution chronologies are crucial for paleoenvironmental reconstructions, and are particularly challenging for lacustrine records of terrestrial paleoclimate.
Irene Tunno +3 more
doaj +1 more source
Journal of Archaeological Method and Theory, 2021 The last decade saw a rapid increase in the number of studies where time–frequency changes of radiocarbon dates have been used as a proxy for inferring past population dynamics.
E. Crema
semanticscholar +1 more source
Interactive Effects Determine Radiocarbon Abundance in Soil Fractions of Global Biomes
Land, 2023 Soil organic carbon (SOC) is heterogeneous, consisting of fractions with differing turnover rates. Climate, vegetation, and soil properties can all affect the characteristics of these different soil carbon fractions.
Guoai Li +3 more
doaj +1 more source
Radiocarbon: An International Journal of Cosmogenic Isotope Research, 2022 Radiocarbon (14C) concentrations in the oceans are different from those in the atmosphere. Understanding these ocean-atmospheric 14C differences is important both to estimate the calendar ages of samples which obtained their 14C in the marine environment,
T. Heaton +7 more
semanticscholar +1 more source
Geosciences, 2023 The investigation of deformations in Quaternary deposits holds primary importance in understanding recent geological history and natural hazards in highly populated areas, such as the Po Plain.
Niccolò Menegoni +5 more
doaj +1 more source