Mike Barbetti
Datos Biográficos
| ID | 101591 |
|---|---|
| NOMBRE | Mike Barbetti |
| NOMBRES | Mike |
| APELLIDO | Barbetti |
| FIRMA | BARBETTI M |
| AFILIACIONES | The University of Sydney |
| VERIFICADO | No |
| TOTAL DE OBRAS | 27 |
| TOTAL DE CITAS | 312 |
| TOTAL COMO AUTOR | 27 |
| TOTAL COMO EDITOR | 0 |
| PRIMER AÑO DE PUBLICACIÓN | 1976 |
| AÑO MÁS RECIENTE DE PUBLICACIÓN | 2013 |
| ÍNDICE H | 9 |
Atmospheric Radiocarbon for the Period 1950–2010
We present a compilation of tropospheric 14 CO 2 for the period 1950–2010, based on published radiocarbon data from selected records of atmospheric CO 2 sampling and tree-ring series. This compilation is a new version of the compilation by Hua and Barbetti (2004) and consists of yearly summer data sets for zonal, hemispheric, and global levels of atmospheric 14 C. In addition, compiled (and extended) monthly data sets for 5 atmospheric zones (3 i…
The water management network of Angkor, Cambodia
Meticulous survey of the banks, channels and reservoirs at Angkor shows them to have been part of a large scale water management network instigated in the ninth century AD. Water collected from the hills was stored and could have been distributed for a wide variety of purposes including flood control, agriculture and ritual while a system of overflows and bypasses carried surplus water away to the lake, the Tonle Sap, to the south. The network ha…
Vegetation and land-use at Angkor, Cambodia
Investigating the use of land during the medieval period at the celebrated ceremonial area of Angkor, the authors took a soil column over 2.5m deep from the inner moat of the Bakong temple. The dated pollen sequence showed that the temple moat was dug in the eighth century AD and that the agriculture of the immediate area subsequently flourished. In the tenth century AD agriculture declined and the moat became choked with water-plants. It was at …
Paul Edward Damon (1921–2005)
I arrived at the University of Arizona in time for the fall semester of 1957.The Geology Department had been criticized by the Physics and Chemistry departments as a good pick and hammer department but behind the times.Urey, a chemist, had initiated the use of stable isotopes in geology, making use of Neir's advances in mass spectrometry.Neir, a physicist, had advanced geochronology; Blackett, a physicist, had initiated the field of geomagnetism;…
Radiocarbon in Annual Tree Rings from Thailand During the Pre-Bomb Period, Ad 1938–1954
Annual tree rings from Thailand were analyzed by radiocarbon AMS for AD 1938–1954. The results showed no significant depletion in atmospheric 14 C over Thailand during the pre-bomb period, even though the air mass to Thailand during the growing season of tree rings is transported over a potentially significant source of oceanic 14 C-depleted CO 2 , out-gassing in the northern Indian Ocean. When compared with Washington and Chile for different per…
Bomb Radiocarbon in Tree Rings from Northern New South Wales, Australia
We have analyzed by radiocarbon 27 consecutive single rings, starting from AD 1952, of a preliminarily cross-dated section (DFR 021) of Pinus radiata , which grew in Armidale, northern New South Wales, Australia. The bomb 14 C results suggested the possibility of 2 false rings, and, consequently, 2 misidentified rings in the preliminary count for this section. This possibility was supported by a better ring-width correlation between the revised D…
No Systematic Early Bias to Mediterranean 14 C Ages
Existing data and theory do not support a recent assertion that upwelling of old carbon has led to systematically 100–300 yr too old radiocarbon ages for the Mediterranean region. Similarly, the prehistoric tree-ring record produced over 3 decades by the Aegean Dendrochronology Project is shown to provide robust, well-replicated data, contrary to a recent unfounded assertion. 14 C and dendrochronology provide an accurate and precise chronometric …
Holocene Vegetation and Paleoclimatic and Paleomagnetic History from Lake Johnston, Tasmania
Lake Johnston cirque contains some of the best subalpine rainforest in Tasmania. Pollen from the sediments shows Lagarostrobos franklinii , which presently reaches 1040 m, may be a glacial relict. Nothofagus cunninghamii–Nothofagus gunnii subalpine rainforest developed between 9000 and 6000 14 C yr B.P., with a maximum at 8700 14 C yr B.P. After 6000 14 C yr B.P. Nothofagus gunnii became more important, and from 3600 14 C yr B.P. sclerophyll and …
Dating the City Wall, Fortifications, and the Palace Site at Pagan
The strengths and limitations of radiocarbon dating as applied to samples taken in and around the walled city center of Pagan, in Burma, are addressed. The last thousand years in mainland Southeast Asia remains a difficult period to date absolutely because of two critical issues. The first is the use of wood from long-lived species, such as teak, in archaeological contexts. The archaeologist dating such material must be aware of the significance …
The Stoneware Kilns of Sisatchanalai and Early Modern Thailand
Little is known about the transition to the Modern Economy in non-European settings. Southeast Asia provides a rare opportunity to evaluate this transition through analysis of the tradeware production system that operated at the site of Sisatchanalai in central northern Thailand. Sisatchanalai is the largest and longest lived (A.C. 1100–1650) stoneware production complex in continental Southeast Asia. Based on the timing and nature of changes in …
New evidence for specialised ceramic production and exchange in the southeast Arabian Iron Age
Results from a programme of PIXE‐PIGME analysis of Iron Age ceramics from southeastern Arabia are presented. Compositional analysis indicates the existence of two discrete Iron Age II ceramic assemblages. A combination of geological and archaeological evidence suggests that one of these was produced in the inland oasis of al‐Ain. Geological evidence in combination with previously published data on the elemental composition of southeast Iranian ce…
Segments of Atmospheric 14 C Change as Derived from Late Glacial and Early Holocene Floating Tree-Ring Series
We present results of 14 C dating of several tree-ring series from the Late Glacial and Early Holocene, analyzed at the Heidelberg University radiocarbon laboratory. Although these are floating series, they contribute high-resolution information about the variability of atmospheric 14 C during those periods
Henry A. Polach, 1925–1996
Henry Polach died in November 1996 at the age of 71 years. He was very much the father of radiocarbon dating in Australia, and a significant player on the worldwide stage of radiocarbon
Radiocarbon Variations from Tasmanian Conifers
Dendrochronological studies are being carried out on two conifer species in the Stanley River area of western Tasmania. The chronology for Huon pine ( Lagarostrobos franklinii ), with living trees up to 1400 yr old, extends back to 571 bc. Living celery-top pine ( Phyllocladus aspleniifolius ) trees are up to 500 yr old. Apart from living or recently felled trees, sections have been taken from 350 subfossil logs preserved in floodplain sediments.…
The Antares AMS Centre
The ANTARES accelerator mass spectrometry facility at Lucas Heights Research Laboratory is operational and AMS measurements of 14 C, 26 Al and 36 Cl are being carried out routinely. Measurement of 129 I recently commenced and capabilities for other long-lived radioisotopes such as 10 Be are being established. The overall aim of the facility is to develop advanced programs in Quaternary science, global climate change, biomedicine and nuclear safeg…
Twelve centuries of occupation of a river-bank setting
The story of a city that was built close by a river must be a watery one. Here is an archaeological and geomorphological study of a medieval Thai city that experienced flooding and sedimentation throughout its life
Climatic change over the last millennium in Tasmania reconstructed from tree-rings
Tree-ring widths from millennium-old Huon pine (Lagarostrobos franklinii) trees have been used to reconstruct warm season (November-April) temperatures back to AD 900 for Tasmania. The reconstruction indicates that the most recent 100 years of climate have been highly unusual, with the coldest and warmest 25-year periods occurring from 1890 to 1914 and 1965 to 1989, respectively. Although the most recent 25-year period is warmer than any comparab…
Radiocarbon Variations from Tasmanian Conifers
Dendrochronological studies have begun on two conifer species in the Stanley River area of western Tasmania. The chronology extends to 273 BC for Huon pine ( Lagarostrobos franklinii ) and to AD 1450 for celery-top pine ( Phyllocladus aspleniifolius ). Apart from living or recently felled trees, sections have been taken from 58 logs preserved in floodplain sediments. Two of these logs have late Pleistocene ages, centered around 13.0 and 12.7 k 14…
Palaeomagnetism and high-resolution dating of ceramic kilns in Thailand
The production of high‐temperature stoneware ceramics began in Thailand some time after AD 900. It developed into a large‐scale industry following a change from in‐ground to surface kilns between the thirteenth and fifteenth centuries, before declining in the sixteenth and seventeenth centuries. High‐resolution dating of the industry is difficult, since historical references, inscriptions on ceramics, and associated coins are sparse. Direct datin…
Traces of fire in the archaeological record, before one million years ago
C Variations from Tasmanian Trees—Preliminary Results
Huon pine is endemic to Tasmania. It has well-defined annual rings, may live for over 2000 years, and is particularly resistant to decay. Celery-top pine has similar characteristics and may live for 800 years. As part of a multi-disciplinary study of these trees and their habitat, a simple wood pretreatment method for isotope analysis is described. The solvent-acid-alkali-acid sequence yields a value of Δ 14 C = −16 ± 6‰ for AD 1941–45 Huon pine …
Revisions to Radiocarbon Dates from the Sydney University Radiocarbon Laboratory
Revisions to Radiocarbon Dates from the Sydney University Radiocarbon Laboratory." Australian Archaeology, 13(1), pp. 28–29
A 38,000‐year‐old archaeological site at Upper Swan, Western Australia
An extensive open‐air site, on an ancient floodplain bordering the Swan River, has been partially uncovered by a clay pit operation. Preliminary excavations of small areas have yielded stone artefacts intimately associated with charcoal and carbonized material, possibly resin. A series of radiocarbon measurements place the site among the earliest yet known from Australia, and indicate that the southwestern corner of the continent was populated by…
Geomagnetic Strength Over the Last 50,000 Years and Changes in Atmospheric 14 C Concentration
Palaeomagnetic field strength measurements for the last 50,000 years are summarized. The period before ~12,000 yr bp is characterized by low dipole moments, but high values are associated with the Lake Mungo polarity excursion between ~32,000 and ~28,000 yr bp. The variation since 12,000 yr bp, based on new results from Australia and published data from the Northern Hemisphere has a quasi-cyclic appearance with maxima at ~10,000 and ~3500 yr bp. …
Archaeomagnetic Results From Late Pleistocene Hearths at Etiolles and Marsangy, France
Atmospheric Radiocarbon for the Period 1950–2010
We present a compilation of tropospheric 14 CO 2 for the period 1950–2010, based on published radiocarbon data from selected records of atmospheric CO 2 sampling and tree-ring series. This compilation is a new version of the compilation by Hua and Barbetti (2004) and consists of yearly summer data sets for zonal, hemispheric, and global levels of atmospheric 14 C. In addition, compiled (and extended) monthly data sets for 5 atmospheric zones (3 i…
A 38,000‐year‐old archaeological site at Upper Swan, Western Australia
An extensive open‐air site, on an ancient floodplain bordering the Swan River, has been partially uncovered by a clay pit operation. Preliminary excavations of small areas have yielded stone artefacts intimately associated with charcoal and carbonized material, possibly resin. A series of radiocarbon measurements place the site among the earliest yet known from Australia, and indicate that the southwestern corner of the continent was populated by…
The water management network of Angkor, Cambodia
Meticulous survey of the banks, channels and reservoirs at Angkor shows them to have been part of a large scale water management network instigated in the ninth century AD. Water collected from the hills was stored and could have been distributed for a wide variety of purposes including flood control, agriculture and ritual while a system of overflows and bypasses carried surplus water away to the lake, the Tonle Sap, to the south. The network ha…
Radiocarbon Variations from Tasmanian Conifers
Dendrochronological studies have begun on two conifer species in the Stanley River area of western Tasmania. The chronology extends to 273 BC for Huon pine ( Lagarostrobos franklinii ) and to AD 1450 for celery-top pine ( Phyllocladus aspleniifolius ). Apart from living or recently felled trees, sections have been taken from 58 logs preserved in floodplain sediments. Two of these logs have late Pleistocene ages, centered around 13.0 and 12.7 k 14…
Bomb Radiocarbon in Tree Rings from Northern New South Wales, Australia
We have analyzed by radiocarbon 27 consecutive single rings, starting from AD 1952, of a preliminarily cross-dated section (DFR 021) of Pinus radiata , which grew in Armidale, northern New South Wales, Australia. The bomb 14 C results suggested the possibility of 2 false rings, and, consequently, 2 misidentified rings in the preliminary count for this section. This possibility was supported by a better ring-width correlation between the revised D…
New evidence for specialised ceramic production and exchange in the southeast Arabian Iron Age
Results from a programme of PIXE‐PIGME analysis of Iron Age ceramics from southeastern Arabia are presented. Compositional analysis indicates the existence of two discrete Iron Age II ceramic assemblages. A combination of geological and archaeological evidence suggests that one of these was produced in the inland oasis of al‐Ain. Geological evidence in combination with previously published data on the elemental composition of southeast Iranian ce…
Geomagnetic Strength Over the Last 50,000 Years and Changes in Atmospheric 14 C Concentration
Palaeomagnetic field strength measurements for the last 50,000 years are summarized. The period before ~12,000 yr bp is characterized by low dipole moments, but high values are associated with the Lake Mungo polarity excursion between ~32,000 and ~28,000 yr bp. The variation since 12,000 yr bp, based on new results from Australia and published data from the Northern Hemisphere has a quasi-cyclic appearance with maxima at ~10,000 and ~3500 yr bp. …
Vegetation and land-use at Angkor, Cambodia
Investigating the use of land during the medieval period at the celebrated ceremonial area of Angkor, the authors took a soil column over 2.5m deep from the inner moat of the Bakong temple. The dated pollen sequence showed that the temple moat was dug in the eighth century AD and that the agriculture of the immediate area subsequently flourished. In the tenth century AD agriculture declined and the moat became choked with water-plants. It was at …
Traces of fire in the archaeological record, before one million years ago
Palaeomagnetism and high-resolution dating of ceramic kilns in Thailand
The production of high‐temperature stoneware ceramics began in Thailand some time after AD 900. It developed into a large‐scale industry following a change from in‐ground to surface kilns between the thirteenth and fifteenth centuries, before declining in the sixteenth and seventeenth centuries. High‐resolution dating of the industry is difficult, since historical references, inscriptions on ceramics, and associated coins are sparse. Direct datin…
Radiocarbon in Annual Tree Rings from Thailand During the Pre-Bomb Period, Ad 1938–1954
Annual tree rings from Thailand were analyzed by radiocarbon AMS for AD 1938–1954. The results showed no significant depletion in atmospheric 14 C over Thailand during the pre-bomb period, even though the air mass to Thailand during the growing season of tree rings is transported over a potentially significant source of oceanic 14 C-depleted CO 2 , out-gassing in the northern Indian Ocean. When compared with Washington and Chile for different per…
Radiocarbon Variations from Tasmanian Conifers
Dendrochronological studies are being carried out on two conifer species in the Stanley River area of western Tasmania. The chronology for Huon pine ( Lagarostrobos franklinii ), with living trees up to 1400 yr old, extends back to 571 bc. Living celery-top pine ( Phyllocladus aspleniifolius ) trees are up to 500 yr old. Apart from living or recently felled trees, sections have been taken from 350 subfossil logs preserved in floodplain sediments.…
Dating the City Wall, Fortifications, and the Palace Site at Pagan
The strengths and limitations of radiocarbon dating as applied to samples taken in and around the walled city center of Pagan, in Burma, are addressed. The last thousand years in mainland Southeast Asia remains a difficult period to date absolutely because of two critical issues. The first is the use of wood from long-lived species, such as teak, in archaeological contexts. The archaeologist dating such material must be aware of the significance …
Archaeomagnetic analyses of six glozelian ceramic artifacts
No Systematic Early Bias to Mediterranean 14 C Ages
Existing data and theory do not support a recent assertion that upwelling of old carbon has led to systematically 100–300 yr too old radiocarbon ages for the Mediterranean region. Similarly, the prehistoric tree-ring record produced over 3 decades by the Aegean Dendrochronology Project is shown to provide robust, well-replicated data, contrary to a recent unfounded assertion. 14 C and dendrochronology provide an accurate and precise chronometric …
Archaeomagnetic Results From Late Pleistocene Hearths at Etiolles and Marsangy, France
The Stoneware Kilns of Sisatchanalai and Early Modern Thailand
Little is known about the transition to the Modern Economy in non-European settings. Southeast Asia provides a rare opportunity to evaluate this transition through analysis of the tradeware production system that operated at the site of Sisatchanalai in central northern Thailand. Sisatchanalai is the largest and longest lived (A.C. 1100–1650) stoneware production complex in continental Southeast Asia. Based on the timing and nature of changes in …
Segments of Atmospheric 14 C Change as Derived from Late Glacial and Early Holocene Floating Tree-Ring Series
We present results of 14 C dating of several tree-ring series from the Late Glacial and Early Holocene, analyzed at the Heidelberg University radiocarbon laboratory. Although these are floating series, they contribute high-resolution information about the variability of atmospheric 14 C during those periods
Climatic change over the last millennium in Tasmania reconstructed from tree-rings
Tree-ring widths from millennium-old Huon pine (Lagarostrobos franklinii) trees have been used to reconstruct warm season (November-April) temperatures back to AD 900 for Tasmania. The reconstruction indicates that the most recent 100 years of climate have been highly unusual, with the coldest and warmest 25-year periods occurring from 1890 to 1914 and 1965 to 1989, respectively. Although the most recent 25-year period is warmer than any comparab…
Revisions to Radiocarbon Dates from the Sydney University Radiocarbon Laboratory
Revisions to Radiocarbon Dates from the Sydney University Radiocarbon Laboratory." Australian Archaeology, 13(1), pp. 28–29
The Antares AMS Centre
The ANTARES accelerator mass spectrometry facility at Lucas Heights Research Laboratory is operational and AMS measurements of 14 C, 26 Al and 36 Cl are being carried out routinely. Measurement of 129 I recently commenced and capabilities for other long-lived radioisotopes such as 10 Be are being established. The overall aim of the facility is to develop advanced programs in Quaternary science, global climate change, biomedicine and nuclear safeg…
Determination of ancient geomagnetic strengths from specimens with multi-component magnetizations
Archaeomagnetic analyses of six glozelian ceramic artifacts
Determination of ancient geomagnetic strengths from specimens with multi-component magnetizations
Geomagnetic Strength Over the Last 50,000 Years and Changes in Atmospheric 14 C Concentration
Palaeomagnetic field strength measurements for the last 50,000 years are summarized. The period before ~12,000 yr bp is characterized by low dipole moments, but high values are associated with the Lake Mungo polarity excursion between ~32,000 and ~28,000 yr bp. The variation since 12,000 yr bp, based on new results from Australia and published data from the Northern Hemisphere has a quasi-cyclic appearance with maxima at ~10,000 and ~3500 yr bp. …
Archaeomagnetic Results From Late Pleistocene Hearths at Etiolles and Marsangy, France
Revisions to Radiocarbon Dates from the Sydney University Radiocarbon Laboratory
Revisions to Radiocarbon Dates from the Sydney University Radiocarbon Laboratory." Australian Archaeology, 13(1), pp. 28–29
A 38,000‐year‐old archaeological site at Upper Swan, Western Australia
An extensive open‐air site, on an ancient floodplain bordering the Swan River, has been partially uncovered by a clay pit operation. Preliminary excavations of small areas have yielded stone artefacts intimately associated with charcoal and carbonized material, possibly resin. A series of radiocarbon measurements place the site among the earliest yet known from Australia, and indicate that the southwestern corner of the continent was populated by…
C Variations from Tasmanian Trees—Preliminary Results
Huon pine is endemic to Tasmania. It has well-defined annual rings, may live for over 2000 years, and is particularly resistant to decay. Celery-top pine has similar characteristics and may live for 800 years. As part of a multi-disciplinary study of these trees and their habitat, a simple wood pretreatment method for isotope analysis is described. The solvent-acid-alkali-acid sequence yields a value of Δ 14 C = −16 ± 6‰ for AD 1941–45 Huon pine …
Traces of fire in the archaeological record, before one million years ago
Palaeomagnetism and high-resolution dating of ceramic kilns in Thailand
The production of high‐temperature stoneware ceramics began in Thailand some time after AD 900. It developed into a large‐scale industry following a change from in‐ground to surface kilns between the thirteenth and fifteenth centuries, before declining in the sixteenth and seventeenth centuries. High‐resolution dating of the industry is difficult, since historical references, inscriptions on ceramics, and associated coins are sparse. Direct datin…
Climatic change over the last millennium in Tasmania reconstructed from tree-rings
Tree-ring widths from millennium-old Huon pine (Lagarostrobos franklinii) trees have been used to reconstruct warm season (November-April) temperatures back to AD 900 for Tasmania. The reconstruction indicates that the most recent 100 years of climate have been highly unusual, with the coldest and warmest 25-year periods occurring from 1890 to 1914 and 1965 to 1989, respectively. Although the most recent 25-year period is warmer than any comparab…
Radiocarbon Variations from Tasmanian Conifers
Dendrochronological studies have begun on two conifer species in the Stanley River area of western Tasmania. The chronology extends to 273 BC for Huon pine ( Lagarostrobos franklinii ) and to AD 1450 for celery-top pine ( Phyllocladus aspleniifolius ). Apart from living or recently felled trees, sections have been taken from 58 logs preserved in floodplain sediments. Two of these logs have late Pleistocene ages, centered around 13.0 and 12.7 k 14…
Twelve centuries of occupation of a river-bank setting
The story of a city that was built close by a river must be a watery one. Here is an archaeological and geomorphological study of a medieval Thai city that experienced flooding and sedimentation throughout its life
Radiocarbon Variations from Tasmanian Conifers
Dendrochronological studies are being carried out on two conifer species in the Stanley River area of western Tasmania. The chronology for Huon pine ( Lagarostrobos franklinii ), with living trees up to 1400 yr old, extends back to 571 bc. Living celery-top pine ( Phyllocladus aspleniifolius ) trees are up to 500 yr old. Apart from living or recently felled trees, sections have been taken from 350 subfossil logs preserved in floodplain sediments.…
The Antares AMS Centre
The ANTARES accelerator mass spectrometry facility at Lucas Heights Research Laboratory is operational and AMS measurements of 14 C, 26 Al and 36 Cl are being carried out routinely. Measurement of 129 I recently commenced and capabilities for other long-lived radioisotopes such as 10 Be are being established. The overall aim of the facility is to develop advanced programs in Quaternary science, global climate change, biomedicine and nuclear safeg…
Henry A. Polach, 1925–1996
Henry Polach died in November 1996 at the age of 71 years. He was very much the father of radiocarbon dating in Australia, and a significant player on the worldwide stage of radiocarbon
Segments of Atmospheric 14 C Change as Derived from Late Glacial and Early Holocene Floating Tree-Ring Series
We present results of 14 C dating of several tree-ring series from the Late Glacial and Early Holocene, analyzed at the Heidelberg University radiocarbon laboratory. Although these are floating series, they contribute high-resolution information about the variability of atmospheric 14 C during those periods
New evidence for specialised ceramic production and exchange in the southeast Arabian Iron Age
Results from a programme of PIXE‐PIGME analysis of Iron Age ceramics from southeastern Arabia are presented. Compositional analysis indicates the existence of two discrete Iron Age II ceramic assemblages. A combination of geological and archaeological evidence suggests that one of these was produced in the inland oasis of al‐Ain. Geological evidence in combination with previously published data on the elemental composition of southeast Iranian ce…
The Stoneware Kilns of Sisatchanalai and Early Modern Thailand
Little is known about the transition to the Modern Economy in non-European settings. Southeast Asia provides a rare opportunity to evaluate this transition through analysis of the tradeware production system that operated at the site of Sisatchanalai in central northern Thailand. Sisatchanalai is the largest and longest lived (A.C. 1100–1650) stoneware production complex in continental Southeast Asia. Based on the timing and nature of changes in …
Holocene Vegetation and Paleoclimatic and Paleomagnetic History from Lake Johnston, Tasmania
Lake Johnston cirque contains some of the best subalpine rainforest in Tasmania. Pollen from the sediments shows Lagarostrobos franklinii , which presently reaches 1040 m, may be a glacial relict. Nothofagus cunninghamii–Nothofagus gunnii subalpine rainforest developed between 9000 and 6000 14 C yr B.P., with a maximum at 8700 14 C yr B.P. After 6000 14 C yr B.P. Nothofagus gunnii became more important, and from 3600 14 C yr B.P. sclerophyll and …
Dating the City Wall, Fortifications, and the Palace Site at Pagan
The strengths and limitations of radiocarbon dating as applied to samples taken in and around the walled city center of Pagan, in Burma, are addressed. The last thousand years in mainland Southeast Asia remains a difficult period to date absolutely because of two critical issues. The first is the use of wood from long-lived species, such as teak, in archaeological contexts. The archaeologist dating such material must be aware of the significance …
No Systematic Early Bias to Mediterranean 14 C Ages
Existing data and theory do not support a recent assertion that upwelling of old carbon has led to systematically 100–300 yr too old radiocarbon ages for the Mediterranean region. Similarly, the prehistoric tree-ring record produced over 3 decades by the Aegean Dendrochronology Project is shown to provide robust, well-replicated data, contrary to a recent unfounded assertion. 14 C and dendrochronology provide an accurate and precise chronometric …
Bomb Radiocarbon in Tree Rings from Northern New South Wales, Australia
We have analyzed by radiocarbon 27 consecutive single rings, starting from AD 1952, of a preliminarily cross-dated section (DFR 021) of Pinus radiata , which grew in Armidale, northern New South Wales, Australia. The bomb 14 C results suggested the possibility of 2 false rings, and, consequently, 2 misidentified rings in the preliminary count for this section. This possibility was supported by a better ring-width correlation between the revised D…
Radiocarbon in Annual Tree Rings from Thailand During the Pre-Bomb Period, Ad 1938–1954
Annual tree rings from Thailand were analyzed by radiocarbon AMS for AD 1938–1954. The results showed no significant depletion in atmospheric 14 C over Thailand during the pre-bomb period, even though the air mass to Thailand during the growing season of tree rings is transported over a potentially significant source of oceanic 14 C-depleted CO 2 , out-gassing in the northern Indian Ocean. When compared with Washington and Chile for different per…
Paul Edward Damon (1921–2005)
I arrived at the University of Arizona in time for the fall semester of 1957.The Geology Department had been criticized by the Physics and Chemistry departments as a good pick and hammer department but behind the times.Urey, a chemist, had initiated the use of stable isotopes in geology, making use of Neir's advances in mass spectrometry.Neir, a physicist, had advanced geochronology; Blackett, a physicist, had initiated the field of geomagnetism;…
Vegetation and land-use at Angkor, Cambodia
Investigating the use of land during the medieval period at the celebrated ceremonial area of Angkor, the authors took a soil column over 2.5m deep from the inner moat of the Bakong temple. The dated pollen sequence showed that the temple moat was dug in the eighth century AD and that the agriculture of the immediate area subsequently flourished. In the tenth century AD agriculture declined and the moat became choked with water-plants. It was at …
Geology (23 obras) · Archaeology (21 obras) · Geography (18 obras) · Radiocarbon dating (17 obras) · Archaeology and ancient environmental studies (15 obras) · Geology and Paleoclimatology Research (15 obras) · Paleontology (12 obras) · History (10 obras) · Physical geography (9 obras) · Tree-ring climate responses (8 obras)