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Gretel Boswijk

Biographic Data

ID4130652
NAMEGretel Boswijk
GIVEN NAMESGretel
FAMILY NAMEBoswijk
SIGNATUREBOSWIJK G
AFFILIATIONSUniversity of Auckland
ORCID0000-0003-3583-7575
VERIFIEDYes
TOTAL WORKS24
TOTAL CITATIONS331
AUTHOR COUNT24
EDITOR COUNT0
FIRST PUBLICATION YEAR1997
LATEST PUBLICATION YEAR2025
H-INDEX7
  • Looking at the Wood, Seeing the Trees and More: Australia-New Zealand Tree-Ring Science Conference, January 2025

    Gretel Boswijk, Luitgard Schwendenmann et al.•ARTICLE•Tree-Ring Research•2025

    The Australia-New Zealand Tree-Ring Conference was held January 21–23, 2025, at Waipapa Taumata Rau/University of Auckland, in Aotearoa/New Zealand. It was intended to provide an opportunity for the Australian and New Zealand dendrochronological researchers to meet, present current research, and discuss the challenges and opportunities in working with Southern Hemisphere tree species, but it was open to others outside of Australasia, including so…

  • ‘An Excellent Empire Wood’: The Awareness, Export, and Use of New Zealand Kauri (Agathis australis) at ‘Home’ (United Kingdom)

    Open Access•Gretel Boswijk•ARTICLE•International Journal of Wood…•2025

    In 2014, a fire at the Glasgow School of Art’s Mackintosh Building revealed the use of New Zealand kauri ( Agathis australis D. Don Lindley) masquerading as oak pillars. A description of this timber as ‘cheap ballast’ in a 2015 Guardian article prompted investigation into the awareness, export, and use of kauri in the United Kingdom (UK). Awareness of kauri in the UK developed during the 1800s, as botanical knowledge of New Zealand flora increase…

  • Genealogies and oral histories as chronological networks: Interfacing whakapapa (Māori genealogies) with Gregorian calendar year archaeological radiocarbon dates

    Open Access•Isaac H Mcivor, A H A Hogg et al.•ARTICLE•Archaeometry•2025•References: 49

    Human genealogies serve multiple functions beyond documenting one's pedigree. They operate as complex social frameworks that structure knowledge, delimit group membership, explain historical causation, are political tools, and provide chronological foundations for understanding past events and processes across diverse knowledge systems. Archaeologists, ethnologists, and historians have long related historical information from genealogies and asso…

  • Building on the past: Refining our current understanding of Lapita stilt structures

    Nicholas W S Hogg, Yilin Chen et al.•ARTICLE•Australian Archaeology•2022•Cited by: 1•References: 2

    This paper reviews our current knowledge of Lapita stilt structures in the Bismarck Archipelago, Papua New Guinea, and contributes new data from the analysis of a wooden post belonging to a Lapita-era stilt structure identified in the site of Adwe in the Arawe Islands. Via taxonomic analysis, the wooden post is identified as Intsia bijuga (Moluccan ironwood or Pacific teak), a saltwater-resistant species that would have proven to be a highly dura…

  • Annual Variation in Atmospheric 14 C Between 1700 BC and 1480 BC

    Open Access•Charlotte Pearson, Lukas Wacker et al.•ARTICLE•Radiocarbon•2020•Cited by: 11•References: 42

    In 2018 Pearson et al. published a new sequence of annual radiocarbon ( 14 C) data derived from oak ( Quercus sp.) trees from Northern Ireland and bristlecone pine ( Pinus longaeva ) from North America across the period 1700–1500 BC. The study indicated that the more highly resolved shape of an annually based calibration dataset could improve the accuracy of 14 C calibration during this period. This finding had implications for the controversial …

  • SHCal20 Southern Hemisphere Calibration, 0–55,000 Years cal BP

    Open Access•Angela Hogg, Timothy J Heaton et al.•ARTICLE•Radiocarbon•2020•Cited by: 235•References: 50

    Early researchers of radiocarbon levels in Southern Hemisphere tree rings identified a variable North-South hemispheric offset, necessitating construction of a separate radiocarbon calibration curve for the South. We present here SHCal20, a revised calibration curve from 0–55,000 cal BP, based upon SHCal13 and fortified by the addition of 14 new tree-ring data sets in the 2140–0, 3520–3453, 3608–3590 and 13,140–11,375 cal BP time intervals. We de…

  • Identifying and Quantifying Tree-Ring Chronology Variance Artefacts Related to Co-Occurring Changes in Growth Rate

    Anthony M Fowler, Gretel Boswijk et al.•ARTICLE•Tree-Ring Research•2019

    Expectations that a warming world will be associated with more hydro-climatological extremes has motivated research exploring if an associated signal is evident in paleoclimate archives. Tree-ring chronologies are central to this work because of their high temporal resolution, but they are also potentially compromised by variance artefacts associated with the evolving composition of the chronology and with data processing. Here we present two emp…

  • The Influence of Calibration Curve Construction and Composition on the Accuracy and Precision of Radiocarbon Wiggle-Matching of Tree Rings, Illustrated by Southern Hemisphere Atmospheric Data Sets fro…

    Open Access•Angela Hogg, Timothy J Heaton et al.•ARTICLE•Radiocarbon•2019

    This research investigates two factors influencing the ability of tree-ring data to provide accurate 14 C calibration information: the fitness and rigor of the statistical model used to combine the data into a curve; and the accuracy, precision and reproducibility of the component 14 C data sets. It presents a new Bayesian spline method for calibration curve construction and tests it on extant and new Southern Hemisphere (SH) data sets (also exam…

  • Dendroarchaeology in New Zealand: Extending the range of archaeologically useful species beyond kauri (Agathis australis)

    Open Access•Gretel Boswijk, Dilys Johns et al.•ARTICLE•Journal of Pacific Archaeology•2019

    Accurately establishing calendar dates for Māori wooden objects would place them in a secure temporal context and enable aspects of manufacturing and use to be explored within and between sites, and across time. Dendrochronology has the potential to produce accurate and precise calendar dates for wooden artefacts but in New Zealand application of this technique to Māori cultural material is limited as there is almost no overlap between wood speci…

  • Assessing the potential to calendar date Māori waka (canoes) using dendrochronology

    Open Access•Gretel Boswijk, Dilys Johns•ARTICLE•Journal of Archaeological Science…•2017•References: 7

  • The first accurate and precise calendar dating of New Zealand Māori Pā, using Otāhau Pā as a case study

    Open Access•Angela Hogg, Warren Gumbley et al.•ARTICLE•Journal of Archaeological Science…•2017•Cited by: 6•References: 4

  • Dendrochronological dating of kauri timbers from Browne's spar station (1832–1836), Mahurangi, Auckland, New Zealand

    Open Access•Gretel Boswijk, Robert Brassey et al.•ARTICLE•Journal of Archaeological Science…•2016•Cited by: 1•References: 2

  • Decadally Resolved Lateglacial Radiocarbon Evidence from New Zealand Kauri

    Open Access•Angela Hogg, John Southon et al.•ARTICLE•Radiocarbon•2016•Cited by: 12•References: 56

    The Last Glacial–Interglacial Transition (LGIT; 15,000–11,000 cal BP) was characterized by complex spatiotemporal patterns of climate change, with numerous studies requiring accurate chronological control to decipher leads from lags in global paleoclimatic, paleoenvironmental, and archaeological records. However, close scrutiny of the few available tree-ring chronologies and radiocarbon-dated sequences composing the IntCal13 14 C calibration curv…

  • The New Zealand Kauri ( Agathis Australis ) Research Project: A Radiocarbon Dating Intercomparison of Younger Dryas Wood and Implications for IntCal13

    Open Access•Angela Hogg, Alan Hogg et al.•ARTICLE•Radiocarbon•2013•Cited by: 15•References: 26

    Wc describe here the New Zealand kauri ( Agathis australis ) Younger Dryas (YD) research project, which aims to undertake Δ 14 C analysis of ∼140 decadal floating wood samples spanning the time interval ∼13.1–11.7 kyr cal BP. We report 14 C intercomparison measurements being undertaken by the carbon dating laboratories at University of Waikato (Wk), University of California at Irvine (UCI), and University of Oxford (OxA). The Wk, UCI, and OxA lab…

  • Tree-ring Dating of Colonial-era Buildings in New Zealand

    Open Access•Gretel Boswijk, Martin John Jones•ARTICLE•Journal of Pacific Archaeology•2011

    This paper describes recent research in dendroarchaeology in New Zealand. In the Northern Hemisphere, dendrochronology is routinely applied to assist with investigating the age and phasing of wooden structures, and is often carried out in conjunction with building recording and documentary research. In New Zealand, tree-ring analysis of building timbers has been undertaken since 2000, in some cases to assist with archaeological investigations of …

  • Revised calendar date for the Taupo eruption derived by 14 C wiggle-matching using a New Zealand kauri 14 C calibration data set

    Open Access•Angela Hogg, David J Lowe et al.•ARTICLE•The Holocene•2011•Cited by: 7•References: 8

    Taupo volcano in central North Island, New Zealand, is the most frequently active and productive rhyolite volcano on Earth. Its latest explosive activity about 1800 years ago generated the spectacular Taupo eruption, the most violent eruption known in the world in the last 5000 years. We present here a new accurate and precise eruption date of ad 232 ± 5 (1718 ± 5 cal. BP) for the Taupo event. This date was derived by wiggle-matching 25 high-prec…

  • High-Precision Radiocarbon Measurements of Tree-Ring Dated Wood from New Zealand: 195 Bc–Ad 995

    Open Access•Alan Hogg, Jonathan Palmer et al.•ARTICLE•Radiocarbon•2011•Cited by: 11•References: 19

    The best means for correcting Southern Hemisphere (SH) radiocarbon measurements, which are significantly influenced by temporal variations in the interhemispheric offset, is by the construction of a SH-specific calibration curve from dendrochronologically dated wood. We present here decadal 14 C measurements on dendrochronologically secure New Zealand kauri ( Agathis australis ), covering the period 195 BC–AD 995, extending the range of calibrati…

  • Holocene vegetation and environmental reconstructions from swamp deposits in the Dargaville region of the North Island, New Zealand: Implications for the history of kauri (Agathis australis)

    Open Access•Donna D’Costa, Donna D'Costa et al.•ARTICLE•The Holocene•2009•References: 3

    Multiproxy analysis of two swamps, representative of numerous sites in the Dargaville area, provide a Holocene record of a transition from flooded marine valleys to freshwater swamp-forests. Dendrochronology of subfossil wood from these and other associated sites provide a record of kauri ( Agathis) growth and demise over 3600 calendar years. A discrepancy between the abundance of kauri pollen and the timing of maximum kauri forest development, a…

  • Investigating the Interhemispheric 14 C Offset in the 1st Millennium AD and Assessment of Laboratory Bias and Calibration Errors

    Open Access•Angela Hogg, Alan Hogg et al.•ARTICLE•Radiocarbon•2009•Cited by: 10•References: 23

    Past measurements of the radiocarbon interhemispheric offset have been restricted to relatively young samples because of a lack of older dendrochronologically secure Southern Hemisphere tree-ring chronologies. The Southern Hemisphere calibration data set SHCal04 earlier than AD 950 utilizes a variable interhemispheric offset derived from measured 2nd millennium AD Southern Hemisphere/Northern Hemisphere sample pairs with the assumption of stable …

  • Extension of the New Zealand kauri (Agathis australis) chronology to 1724 BC

    Open Access•Gretel Boswijk, Anthony Fowler et al.•ARTICLE•The Holocene•2006•Cited by: 11

    Long tree-ring chronologies have been constructed in the Northern Hemisphere for dendroclimatology and palaeoenvironmental studies, radiocarbon calibration and archaeological dating. Numerous tree-ring chronologies have also been built in the Southern Hemisphere, primarily for dendroclimatology, but multimillennial chronologies are rare. Development of long chronologies from the Southern Hemisphere is therefore important to provide a long-term pe…

  • Tree-Ring Studies on Agathis australis (Kauri): A Synthesis of Development Work on Late Holocene Chronologies

    Open Access•Anthony Fowler, Anthony M Fowler et al.•ARTICLE•Tree-Ring Research•2004

    The potential of kauri (Agathis australis) for paleoclimate research is well established. Multiple tree-ring chronologies have been derived from living and sub-fossil material and growth-climate relationships have been identified. Work has progressed to the stage where raw ring-width data and chronologies covering the last half of the second millennium can confidently be placed in the public domain, to facilitate multi-proxy paleoclimate studies.…

  • Vegetation changes since early Maori fires in Waipoua Forest, Northern New Zealand

    Open Access•J Ogden, Y Deng et al.•ARTICLE•Journal of Archaeological Science•2003•Cited by: 2•References: 1

  • Pinus and Prostomis: A dendrochronological and palaeoentomological study of a mid-Holocene woodland in eastern England

    Open Access•Gretel Boswijk, Nicki J Whitehouse et al.•ARTICLE•The Holocene•2002•Cited by: 7•References: 5

    Tree-ring analysis of subfossil Pinus sylvestris L. and Quercus sp. and their associated subfossil insect assemblages from tree rot-holes have been used to study a prehistoric forest buried in the basal peats at Tyrham Hall Quarry, Hatfield Moors SSSI, in the Humberhead Levels, eastern England. The site provided a rare opportunity to examine the date, composition, age structure and entomological biodiversity of a mid-Holocene Pinus-dominated fore…

  • List 80 Tree-Ring Dates from Sheffield University

    Ian Tyers, Cathy Groves et al.•ARTICLE•Vernacular Architecture•1997•Cited by: 2

  • SHCal20 Southern Hemisphere Calibration, 0–55,000 Years cal BP

    Open Access•Angela Hogg, Timothy J Heaton et al.•ARTICLE•Radiocarbon•2020•Cited by: 235•References: 50

    Early researchers of radiocarbon levels in Southern Hemisphere tree rings identified a variable North-South hemispheric offset, necessitating construction of a separate radiocarbon calibration curve for the South. We present here SHCal20, a revised calibration curve from 0–55,000 cal BP, based upon SHCal13 and fortified by the addition of 14 new tree-ring data sets in the 2140–0, 3520–3453, 3608–3590 and 13,140–11,375 cal BP time intervals. We de…

  • The New Zealand Kauri ( Agathis Australis ) Research Project: A Radiocarbon Dating Intercomparison of Younger Dryas Wood and Implications for IntCal13

    Open Access•Angela Hogg, Alan Hogg et al.•ARTICLE•Radiocarbon•2013•Cited by: 15•References: 26

    Wc describe here the New Zealand kauri ( Agathis australis ) Younger Dryas (YD) research project, which aims to undertake Δ 14 C analysis of ∼140 decadal floating wood samples spanning the time interval ∼13.1–11.7 kyr cal BP. We report 14 C intercomparison measurements being undertaken by the carbon dating laboratories at University of Waikato (Wk), University of California at Irvine (UCI), and University of Oxford (OxA). The Wk, UCI, and OxA lab…

  • Decadally Resolved Lateglacial Radiocarbon Evidence from New Zealand Kauri

    Open Access•Angela Hogg, John Southon et al.•ARTICLE•Radiocarbon•2016•Cited by: 12•References: 56

    The Last Glacial–Interglacial Transition (LGIT; 15,000–11,000 cal BP) was characterized by complex spatiotemporal patterns of climate change, with numerous studies requiring accurate chronological control to decipher leads from lags in global paleoclimatic, paleoenvironmental, and archaeological records. However, close scrutiny of the few available tree-ring chronologies and radiocarbon-dated sequences composing the IntCal13 14 C calibration curv…

  • Annual Variation in Atmospheric 14 C Between 1700 BC and 1480 BC

    Open Access•Charlotte Pearson, Lukas Wacker et al.•ARTICLE•Radiocarbon•2020•Cited by: 11•References: 42

    In 2018 Pearson et al. published a new sequence of annual radiocarbon ( 14 C) data derived from oak ( Quercus sp.) trees from Northern Ireland and bristlecone pine ( Pinus longaeva ) from North America across the period 1700–1500 BC. The study indicated that the more highly resolved shape of an annually based calibration dataset could improve the accuracy of 14 C calibration during this period. This finding had implications for the controversial …

  • High-Precision Radiocarbon Measurements of Tree-Ring Dated Wood from New Zealand: 195 Bc–Ad 995

    Open Access•Alan Hogg, Jonathan Palmer et al.•ARTICLE•Radiocarbon•2011•Cited by: 11•References: 19

    The best means for correcting Southern Hemisphere (SH) radiocarbon measurements, which are significantly influenced by temporal variations in the interhemispheric offset, is by the construction of a SH-specific calibration curve from dendrochronologically dated wood. We present here decadal 14 C measurements on dendrochronologically secure New Zealand kauri ( Agathis australis ), covering the period 195 BC–AD 995, extending the range of calibrati…

  • Extension of the New Zealand kauri (Agathis australis) chronology to 1724 BC

    Open Access•Gretel Boswijk, Anthony Fowler et al.•ARTICLE•The Holocene•2006•Cited by: 11

    Long tree-ring chronologies have been constructed in the Northern Hemisphere for dendroclimatology and palaeoenvironmental studies, radiocarbon calibration and archaeological dating. Numerous tree-ring chronologies have also been built in the Southern Hemisphere, primarily for dendroclimatology, but multimillennial chronologies are rare. Development of long chronologies from the Southern Hemisphere is therefore important to provide a long-term pe…

  • Investigating the Interhemispheric 14 C Offset in the 1st Millennium AD and Assessment of Laboratory Bias and Calibration Errors

    Open Access•Angela Hogg, Alan Hogg et al.•ARTICLE•Radiocarbon•2009•Cited by: 10•References: 23

    Past measurements of the radiocarbon interhemispheric offset have been restricted to relatively young samples because of a lack of older dendrochronologically secure Southern Hemisphere tree-ring chronologies. The Southern Hemisphere calibration data set SHCal04 earlier than AD 950 utilizes a variable interhemispheric offset derived from measured 2nd millennium AD Southern Hemisphere/Northern Hemisphere sample pairs with the assumption of stable …

  • Revised calendar date for the Taupo eruption derived by 14 C wiggle-matching using a New Zealand kauri 14 C calibration data set

    Open Access•Angela Hogg, David J Lowe et al.•ARTICLE•The Holocene•2011•Cited by: 7•References: 8

    Taupo volcano in central North Island, New Zealand, is the most frequently active and productive rhyolite volcano on Earth. Its latest explosive activity about 1800 years ago generated the spectacular Taupo eruption, the most violent eruption known in the world in the last 5000 years. We present here a new accurate and precise eruption date of ad 232 ± 5 (1718 ± 5 cal. BP) for the Taupo event. This date was derived by wiggle-matching 25 high-prec…

  • Pinus and Prostomis: A dendrochronological and palaeoentomological study of a mid-Holocene woodland in eastern England

    Open Access•Gretel Boswijk, Nicki J Whitehouse et al.•ARTICLE•The Holocene•2002•Cited by: 7•References: 5

    Tree-ring analysis of subfossil Pinus sylvestris L. and Quercus sp. and their associated subfossil insect assemblages from tree rot-holes have been used to study a prehistoric forest buried in the basal peats at Tyrham Hall Quarry, Hatfield Moors SSSI, in the Humberhead Levels, eastern England. The site provided a rare opportunity to examine the date, composition, age structure and entomological biodiversity of a mid-Holocene Pinus-dominated fore…

  • The first accurate and precise calendar dating of New Zealand Māori Pā, using Otāhau Pā as a case study

    Open Access•Angela Hogg, Warren Gumbley et al.•ARTICLE•Journal of Archaeological Science…•2017•Cited by: 6•References: 4

  • Vegetation changes since early Maori fires in Waipoua Forest, Northern New Zealand

    Open Access•J Ogden, Y Deng et al.•ARTICLE•Journal of Archaeological Science•2003•Cited by: 2•References: 1

  • List 80 Tree-Ring Dates from Sheffield University

    Ian Tyers, Cathy Groves et al.•ARTICLE•Vernacular Architecture•1997•Cited by: 2

  • Building on the past: Refining our current understanding of Lapita stilt structures

    Nicholas W S Hogg, Yilin Chen et al.•ARTICLE•Australian Archaeology•2022•Cited by: 1•References: 2

    This paper reviews our current knowledge of Lapita stilt structures in the Bismarck Archipelago, Papua New Guinea, and contributes new data from the analysis of a wooden post belonging to a Lapita-era stilt structure identified in the site of Adwe in the Arawe Islands. Via taxonomic analysis, the wooden post is identified as Intsia bijuga (Moluccan ironwood or Pacific teak), a saltwater-resistant species that would have proven to be a highly dura…

  • Dendrochronological dating of kauri timbers from Browne's spar station (1832–1836), Mahurangi, Auckland, New Zealand

    Open Access•Gretel Boswijk, Robert Brassey et al.•ARTICLE•Journal of Archaeological Science…•2016•Cited by: 1•References: 2

  • List 80 Tree-Ring Dates from Sheffield University

    Ian Tyers, Cathy Groves et al.•ARTICLE•Vernacular Architecture•1997•Cited by: 2

  • Pinus and Prostomis: A dendrochronological and palaeoentomological study of a mid-Holocene woodland in eastern England

    Open Access•Gretel Boswijk, Nicki J Whitehouse et al.•ARTICLE•The Holocene•2002•Cited by: 7•References: 5

    Tree-ring analysis of subfossil Pinus sylvestris L. and Quercus sp. and their associated subfossil insect assemblages from tree rot-holes have been used to study a prehistoric forest buried in the basal peats at Tyrham Hall Quarry, Hatfield Moors SSSI, in the Humberhead Levels, eastern England. The site provided a rare opportunity to examine the date, composition, age structure and entomological biodiversity of a mid-Holocene Pinus-dominated fore…

  • Vegetation changes since early Maori fires in Waipoua Forest, Northern New Zealand

    Open Access•J Ogden, Y Deng et al.•ARTICLE•Journal of Archaeological Science•2003•Cited by: 2•References: 1

  • Tree-Ring Studies on Agathis australis (Kauri): A Synthesis of Development Work on Late Holocene Chronologies

    Open Access•Anthony Fowler, Anthony M Fowler et al.•ARTICLE•Tree-Ring Research•2004

    The potential of kauri (Agathis australis) for paleoclimate research is well established. Multiple tree-ring chronologies have been derived from living and sub-fossil material and growth-climate relationships have been identified. Work has progressed to the stage where raw ring-width data and chronologies covering the last half of the second millennium can confidently be placed in the public domain, to facilitate multi-proxy paleoclimate studies.…

  • Extension of the New Zealand kauri (Agathis australis) chronology to 1724 BC

    Open Access•Gretel Boswijk, Anthony Fowler et al.•ARTICLE•The Holocene•2006•Cited by: 11

    Long tree-ring chronologies have been constructed in the Northern Hemisphere for dendroclimatology and palaeoenvironmental studies, radiocarbon calibration and archaeological dating. Numerous tree-ring chronologies have also been built in the Southern Hemisphere, primarily for dendroclimatology, but multimillennial chronologies are rare. Development of long chronologies from the Southern Hemisphere is therefore important to provide a long-term pe…

  • Holocene vegetation and environmental reconstructions from swamp deposits in the Dargaville region of the North Island, New Zealand: Implications for the history of kauri (Agathis australis)

    Open Access•Donna D’Costa, Donna D'Costa et al.•ARTICLE•The Holocene•2009•References: 3

    Multiproxy analysis of two swamps, representative of numerous sites in the Dargaville area, provide a Holocene record of a transition from flooded marine valleys to freshwater swamp-forests. Dendrochronology of subfossil wood from these and other associated sites provide a record of kauri ( Agathis) growth and demise over 3600 calendar years. A discrepancy between the abundance of kauri pollen and the timing of maximum kauri forest development, a…

  • Investigating the Interhemispheric 14 C Offset in the 1st Millennium AD and Assessment of Laboratory Bias and Calibration Errors

    Open Access•Angela Hogg, Alan Hogg et al.•ARTICLE•Radiocarbon•2009•Cited by: 10•References: 23

    Past measurements of the radiocarbon interhemispheric offset have been restricted to relatively young samples because of a lack of older dendrochronologically secure Southern Hemisphere tree-ring chronologies. The Southern Hemisphere calibration data set SHCal04 earlier than AD 950 utilizes a variable interhemispheric offset derived from measured 2nd millennium AD Southern Hemisphere/Northern Hemisphere sample pairs with the assumption of stable …

  • Tree-ring Dating of Colonial-era Buildings in New Zealand

    Open Access•Gretel Boswijk, Martin John Jones•ARTICLE•Journal of Pacific Archaeology•2011

    This paper describes recent research in dendroarchaeology in New Zealand. In the Northern Hemisphere, dendrochronology is routinely applied to assist with investigating the age and phasing of wooden structures, and is often carried out in conjunction with building recording and documentary research. In New Zealand, tree-ring analysis of building timbers has been undertaken since 2000, in some cases to assist with archaeological investigations of …

  • Revised calendar date for the Taupo eruption derived by 14 C wiggle-matching using a New Zealand kauri 14 C calibration data set

    Open Access•Angela Hogg, David J Lowe et al.•ARTICLE•The Holocene•2011•Cited by: 7•References: 8

    Taupo volcano in central North Island, New Zealand, is the most frequently active and productive rhyolite volcano on Earth. Its latest explosive activity about 1800 years ago generated the spectacular Taupo eruption, the most violent eruption known in the world in the last 5000 years. We present here a new accurate and precise eruption date of ad 232 ± 5 (1718 ± 5 cal. BP) for the Taupo event. This date was derived by wiggle-matching 25 high-prec…

  • High-Precision Radiocarbon Measurements of Tree-Ring Dated Wood from New Zealand: 195 Bc–Ad 995

    Open Access•Alan Hogg, Jonathan Palmer et al.•ARTICLE•Radiocarbon•2011•Cited by: 11•References: 19

    The best means for correcting Southern Hemisphere (SH) radiocarbon measurements, which are significantly influenced by temporal variations in the interhemispheric offset, is by the construction of a SH-specific calibration curve from dendrochronologically dated wood. We present here decadal 14 C measurements on dendrochronologically secure New Zealand kauri ( Agathis australis ), covering the period 195 BC–AD 995, extending the range of calibrati…

  • The New Zealand Kauri ( Agathis Australis ) Research Project: A Radiocarbon Dating Intercomparison of Younger Dryas Wood and Implications for IntCal13

    Open Access•Angela Hogg, Alan Hogg et al.•ARTICLE•Radiocarbon•2013•Cited by: 15•References: 26

    Wc describe here the New Zealand kauri ( Agathis australis ) Younger Dryas (YD) research project, which aims to undertake Δ 14 C analysis of ∼140 decadal floating wood samples spanning the time interval ∼13.1–11.7 kyr cal BP. We report 14 C intercomparison measurements being undertaken by the carbon dating laboratories at University of Waikato (Wk), University of California at Irvine (UCI), and University of Oxford (OxA). The Wk, UCI, and OxA lab…

  • Dendrochronological dating of kauri timbers from Browne's spar station (1832–1836), Mahurangi, Auckland, New Zealand

    Open Access•Gretel Boswijk, Robert Brassey et al.•ARTICLE•Journal of Archaeological Science…•2016•Cited by: 1•References: 2

  • Decadally Resolved Lateglacial Radiocarbon Evidence from New Zealand Kauri

    Open Access•Angela Hogg, John Southon et al.•ARTICLE•Radiocarbon•2016•Cited by: 12•References: 56

    The Last Glacial–Interglacial Transition (LGIT; 15,000–11,000 cal BP) was characterized by complex spatiotemporal patterns of climate change, with numerous studies requiring accurate chronological control to decipher leads from lags in global paleoclimatic, paleoenvironmental, and archaeological records. However, close scrutiny of the few available tree-ring chronologies and radiocarbon-dated sequences composing the IntCal13 14 C calibration curv…

  • Assessing the potential to calendar date Māori waka (canoes) using dendrochronology

    Open Access•Gretel Boswijk, Dilys Johns•ARTICLE•Journal of Archaeological Science…•2017•References: 7

  • The first accurate and precise calendar dating of New Zealand Māori Pā, using Otāhau Pā as a case study

    Open Access•Angela Hogg, Warren Gumbley et al.•ARTICLE•Journal of Archaeological Science…•2017•Cited by: 6•References: 4

  • Identifying and Quantifying Tree-Ring Chronology Variance Artefacts Related to Co-Occurring Changes in Growth Rate

    Anthony M Fowler, Gretel Boswijk et al.•ARTICLE•Tree-Ring Research•2019

    Expectations that a warming world will be associated with more hydro-climatological extremes has motivated research exploring if an associated signal is evident in paleoclimate archives. Tree-ring chronologies are central to this work because of their high temporal resolution, but they are also potentially compromised by variance artefacts associated with the evolving composition of the chronology and with data processing. Here we present two emp…

  • The Influence of Calibration Curve Construction and Composition on the Accuracy and Precision of Radiocarbon Wiggle-Matching of Tree Rings, Illustrated by Southern Hemisphere Atmospheric Data Sets fro…

    Open Access•Angela Hogg, Timothy J Heaton et al.•ARTICLE•Radiocarbon•2019

    This research investigates two factors influencing the ability of tree-ring data to provide accurate 14 C calibration information: the fitness and rigor of the statistical model used to combine the data into a curve; and the accuracy, precision and reproducibility of the component 14 C data sets. It presents a new Bayesian spline method for calibration curve construction and tests it on extant and new Southern Hemisphere (SH) data sets (also exam…

  • Dendroarchaeology in New Zealand: Extending the range of archaeologically useful species beyond kauri (Agathis australis)

    Open Access•Gretel Boswijk, Dilys Johns et al.•ARTICLE•Journal of Pacific Archaeology•2019

    Accurately establishing calendar dates for Māori wooden objects would place them in a secure temporal context and enable aspects of manufacturing and use to be explored within and between sites, and across time. Dendrochronology has the potential to produce accurate and precise calendar dates for wooden artefacts but in New Zealand application of this technique to Māori cultural material is limited as there is almost no overlap between wood speci…

  • Annual Variation in Atmospheric 14 C Between 1700 BC and 1480 BC

    Open Access•Charlotte Pearson, Lukas Wacker et al.•ARTICLE•Radiocarbon•2020•Cited by: 11•References: 42

    In 2018 Pearson et al. published a new sequence of annual radiocarbon ( 14 C) data derived from oak ( Quercus sp.) trees from Northern Ireland and bristlecone pine ( Pinus longaeva ) from North America across the period 1700–1500 BC. The study indicated that the more highly resolved shape of an annually based calibration dataset could improve the accuracy of 14 C calibration during this period. This finding had implications for the controversial …

  • SHCal20 Southern Hemisphere Calibration, 0–55,000 Years cal BP

    Open Access•Angela Hogg, Timothy J Heaton et al.•ARTICLE•Radiocarbon•2020•Cited by: 235•References: 50

    Early researchers of radiocarbon levels in Southern Hemisphere tree rings identified a variable North-South hemispheric offset, necessitating construction of a separate radiocarbon calibration curve for the South. We present here SHCal20, a revised calibration curve from 0–55,000 cal BP, based upon SHCal13 and fortified by the addition of 14 new tree-ring data sets in the 2140–0, 3520–3453, 3608–3590 and 13,140–11,375 cal BP time intervals. We de…

  • Building on the past: Refining our current understanding of Lapita stilt structures

    Nicholas W S Hogg, Yilin Chen et al.•ARTICLE•Australian Archaeology•2022•Cited by: 1•References: 2

    This paper reviews our current knowledge of Lapita stilt structures in the Bismarck Archipelago, Papua New Guinea, and contributes new data from the analysis of a wooden post belonging to a Lapita-era stilt structure identified in the site of Adwe in the Arawe Islands. Via taxonomic analysis, the wooden post is identified as Intsia bijuga (Moluccan ironwood or Pacific teak), a saltwater-resistant species that would have proven to be a highly dura…

  • Looking at the Wood, Seeing the Trees and More: Australia-New Zealand Tree-Ring Science Conference, January 2025

    Gretel Boswijk, Luitgard Schwendenmann et al.•ARTICLE•Tree-Ring Research•2025

    The Australia-New Zealand Tree-Ring Conference was held January 21–23, 2025, at Waipapa Taumata Rau/University of Auckland, in Aotearoa/New Zealand. It was intended to provide an opportunity for the Australian and New Zealand dendrochronological researchers to meet, present current research, and discuss the challenges and opportunities in working with Southern Hemisphere tree species, but it was open to others outside of Australasia, including so…

  • ‘An Excellent Empire Wood’: The Awareness, Export, and Use of New Zealand Kauri (Agathis australis) at ‘Home’ (United Kingdom)

    Open Access•Gretel Boswijk•ARTICLE•International Journal of Wood…•2025

    In 2014, a fire at the Glasgow School of Art’s Mackintosh Building revealed the use of New Zealand kauri ( Agathis australis D. Don Lindley) masquerading as oak pillars. A description of this timber as ‘cheap ballast’ in a 2015 Guardian article prompted investigation into the awareness, export, and use of kauri in the United Kingdom (UK). Awareness of kauri in the UK developed during the 1800s, as botanical knowledge of New Zealand flora increase…

  • Genealogies and oral histories as chronological networks: Interfacing whakapapa (Māori genealogies) with Gregorian calendar year archaeological radiocarbon dates

    Open Access•Isaac H Mcivor, A H A Hogg et al.•ARTICLE•Archaeometry•2025•References: 49

    Human genealogies serve multiple functions beyond documenting one's pedigree. They operate as complex social frameworks that structure knowledge, delimit group membership, explain historical causation, are political tools, and provide chronological foundations for understanding past events and processes across diverse knowledge systems. Archaeologists, ethnologists, and historians have long related historical information from genealogies and asso…

Geography (19 works) · Geology and Paleoclimatology Research (19 works) · Archaeology (15 works) · Geology (14 works) · Radiocarbon dating (13 works) · Tree-ring climate responses (13 works) · Dendrochronology (12 works) · Archaeology and ancient environmental studies (11 works) · Pacific and Southeast Asian Studies (9 works) · Climatology (8 works)

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