Radiocarbon dating is a method for determining the age of an object containing organic material by using the properties of radiocarbon, a radioactive isotope of carbon.
Dendrochronology is the scientific method of dating tree rings to the exact year they were formed in a tree. As well as dating them, this can give data for dendroclimatology, the study of climate and atmospheric conditions during different periods in history from the wood of old trees. Dendrochronology derives from the Ancient Greek dendron, meaning "tree", khronos, meaning "time", and -logia, "the study of".
Carbon-14, C-14, 14
C or radiocarbon, is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons. Its presence in organic materials is the basis of the radiocarbon dating method pioneered by Willard Libby and colleagues (1949) to date archaeological, geological and hydrogeological samples. Carbon-14 was discovered on February 27, 1940, by Martin Kamen and Sam Ruben at the University of California Radiation Laboratory in Berkeley, California. Its existence had been suggested by Franz Kurie in 1934.
The prehistory of North Africa spans the period of earliest human presence in the region to gradual onset of historicity in the Maghreb (Berber:Tamazgha) during classical antiquity. Early anatomically modern humans are known to have been present at Jebel Irhoud, in what is now Morocco, approximately 300,000 years ago. The Nile Valley region, via ancient Egypt, contributed to the Neolithic, Bronze Age and Iron Age periods of the Old World, along with the ancient Near East.
The Chauvet-Pont-d'Arc Cave in the Ardèche department of southeastern France is a cave that contains some of the best-preserved figurative cave paintings in the world, as well as other evidence of Upper Paleolithic life. It is located near the commune of Vallon-Pont-d'Arc on a limestone cliff above the former bed of the river Ardèche, in the Gorges de l'Ardèche.
The year 2004 in archaeology included many events, some of which are listed below.
Aetokremnos is a rock shelter near Limassol on the southern coast of Cyprus. It is situated on a steep cliff site c. 40 m (131.23 ft) above the Mediterranean sea. The name means "Cliff of the eagles" in Greek. Around 40 m2 (430.56 sq ft) have been excavated and out of the four layers documented, the third is sterile.
A varve is an annual layer of sediment or sedimentary rock.
Before Present (BP) years, also known as "time before present" or "years before present (YBP)", is a time scale used mainly in archaeology, geology and other scientific disciplines to specify when events occurred relative to the origin of practical radiocarbon dating in the 1950s. Because the "present" time changes, standard practice is to use 1 January 1950 as the commencement date (epoch) of the age scale. The abbreviation "BP" has been interpreted retrospectively as "Before Physics", which refers to the time before nuclear weapons testing artificially altered the proportion of the carbon isotopes in the atmosphere, which scientists must now account for.
Monte Verde is a Paleolithic archaeological site in the Llanquihue Province in southern Chile, located near Puerto Montt, Los Lagos Region. It contains two separate layers, the younger Monte Verde II, dating to 14,500 cal BP, and an older, much more controversial layer suggested to date to 18,500 cal BP. The Monte Verde II site has been considered key evidence showing that the human settlement of the Americas pre-dates the Clovis culture by roughly 1,000 years. This contradicts the previously accepted "Clovis first" model which holds that settlement of the Americas began after 13,500 cal BP. The Monte Verde findings were initially dismissed by most of the scientific community, but the evidence then became more accepted in archaeological circles.
The Minoan eruption was a catastrophic volcanic eruption that devastated the Aegean island of Thera circa 1600 BCE. It destroyed the Minoan settlement at Akrotiri, as well as communities and agricultural areas on nearby islands and the coast of Crete with subsequent earthquakes and paleotsunamis. With a VEI magnitude of a 7, resulting in an ejection of approximately 28–41 km3 (6.7–9.8 cu mi) of dense-rock equivalent (DRE), the eruption was one of the largest volcanic events on Earth in human history. Since tephra from the Minoan eruption serves as a marker horizon in nearly all archaeological sites in the Eastern Mediterranean, its precise date is of high importance and has been fiercely debated among archaeologists and volcanologists for decades, without coming to a definite conclusion.
The Hallstatt plateau is a term used in archaeology that refers to a consistently flat area on graphs that plot radiocarbon dating against calendar dates. Radiocarbon dates of around 2450 BP always calibrate to c. 800–400 BC, no matter the measurement precision. The carbon 14 dating method is hampered by this large plateau on the calibration curve in a critical period of human technological development. Just before and after the plateau, calibration is accurate; during the plateau only techniques like wiggle matching can yield useful calendar dates. The plateau is named after the Hallstatt culture period in central Europe with which it coincides.
Gabarnmung is an archaeological and rock art site in south-western Arnhem Land, in the Top End of Australia’s Northern Territory. Habitation of the site has been dated to at least 44,000 years ago, placing it among the oldest radiocarbon dated sites in Australia. The oldest rock art was produced more than 28,000 years ago, making it the oldest securely dated prehistoric art in Australia. The cave was still visited by members of the Jawoyn within living memory, possibly until as late as the 1950s, but its existence had been forgotten until its 2006 rediscovery.
The ASPRO chronology is a nine-period dating system of the ancient Near East used by the Maison de l'Orient et de la Méditerranée for archaeological sites aged between 14,000 and 5,700 BP.
The 774–775 carbon-14 spike is an observed increase of around 1.2% in the concentration of the radioactive carbon-14 isotope in tree rings dated to 774 or 775 CE, which is about 20 times higher than the normal year-to-year variation of radiocarbon in the atmosphere. It was discovered during a study of Japanese cedar tree-rings, with the year of occurrence determined through dendrochronology. A surge in beryllium isotope 10
Be, detected in Antarctic ice cores, has also been associated with the 774–775 event. The 774–775 CE carbon-14 spike is one of the several Miyake events and it produced the largest and most rapid rise in carbon-14 ever recorded.
Christopher Bronk Ramsey is a British physicist, mathematician and specialist in radiocarbon dating. He is a professor at the University of Oxford and was the Director of the Research Laboratory for Archaeology and the History of Art (RLAHA) from 2014 until 2019. He is a member of Merton College, Oxford and a Bodley Fellow. His doctorate, completed in 1987, included the first successful implementation of carbon dioxide gas as a target for radiocarbon dating via accelerator mass spectrometry.
Lake Suigetsu is a lake in the Hokuriku region of Honshu, Japan, which is one of the Mikata Five Lakes located in Mihama and Wakasa, Fukui Prefecture, close to the coast of the Wakasa Bay in the Sea of Japan. Since 1993, it has been attracting the attention of scientists because of the undisturbed nature of the water for many thousands of years. It is possible to identify the annual deposits of silt in a similar manner that tree rings are identified.
Minze Stuiver was a geochemist who was at the forefront of geoscience research from the 1960s until his retirement in 1998. He helped transform radiocarbon dating from a simple tool for archaeology and geology to a precise technique with applications in solar physics, oceanography, geochemistry, and carbon dynamics. Minze Stuiver's research encompassed the use of radiocarbon (14C) to understand solar cycles and radiocarbon production, ocean circulation, lake carbon dynamics and archaeology as well as the use of stable isotopes to document past climate changes.
Radiocarbon dating measurements produce ages in "radiocarbon years", which must be converted to calendar ages by a process called calibration. Calibration is needed because the atmospheric 14
C:12
C ratio, which is a key element in calculating radiocarbon ages, has not been constant historically.
Thomas Higham is an archaeological scientist and radiocarbon dating specialist. He has worked as Professor of Archaeological Science at the University of Oxford, UK, where he was the Director of the Oxford Radiocarbon Accelerator Unit (ORAU) in the Research Lab for Archaeology and the History of Art. He is best known for his work in dating the Neanderthal extinction and the arrival of modern humans in Europe. He took up a post of Professor of Scientific Archaeology at the University of Vienna in August 2021.
