Radioactive carbon-14 atoms rapidly mix and become uniform throughout the atmosphere.
Deep oceans, the biosphere, and carbonate rocks are giant reservoirs of carbon and with the addition of the atmosphere they constitute the carbon cycle of the Earth.
Living organisms are constantly incorporating this C-14 into their bodies along with other carbon isotopes.
When the organisms die, they stop incorporating new C-14, and the old C-14 starts to decay back into N-14 by emitting beta particles.
This methodological framework is applied to Hohokam radiocarbon dates, and a chronology much shorter than the original Gladwin-Haury formulation is supported.
C analyses were performed on shell carbonate of modern land snails from limestone and nonlimestone areas of Jamaica.
The majority of radiocarbon dates obtained for humic acids and pedogenic carbonates from the Bryansk paleosols are rejuvenated.
This fact was explained by the existence of the soils on the surface for a long time at the maximum of glaciation in MIS 2.
The city of Eriha in Palestine was dated back to eleven thousand years, and was designated as the first permanent human settlement.
-Authors ABSTRACT: The radiocarbon dates for the Bryansk paleosols in different sections of the Central Russian Upland, Alexandrov quarry, Zheleznogorsk, KBS-13, Taneyev quarry, Fatyanovka, Monastyrshchina, Kostenki-14, were obtained for different carbonaceous materials including sum of humic acids, pedogenic carbonates, charcoal, and bone collagen.
The morphogenetic analysis of the paleosols including micromorphological observations was also conducted.
Palaeosolos are meadow-carbonate or sod-carbonate with evidence of permafrost processes.
The interval of the Bryansk paleosols development in the Late Pleistocene was between 33–26 ka BP, formed over 5–7 ka.