Rewi Newnham
Biographic Data
| ID | 4627472 |
|---|---|
| NAME | Rewi Newnham |
| GIVEN NAMES | Rewi |
| FAMILY NAME | Newnham |
| SIGNATURE | NEWNHAM R |
| AFFILIATIONS | University of Plymouth |
| ORCID | 0000-0002-6044-8945 |
| VERIFIED | Yes |
| TOTAL WORKS | 19 |
| TOTAL CITATIONS | 57 |
| AUTHOR COUNT | 19 |
| EDITOR COUNT | 0 |
| FIRST PUBLICATION YEAR | 1993 |
| LATEST PUBLICATION YEAR | 2018 |
| H-INDEX | 5 |
Formal ratification of the subdivision of the Holocene Series/Epoch (Quaternary System/Period)
Mike Walker, Martin J. Head, Max Berkelhammer, Svante Björck, Hai Cheng, Les Cwynar, David Fisher, Vasilios Gkinis, Antony Long, John Lowe, Rewi Newnham, Sune Olander Rasmussen, Harvey Weiss. Episodes 2018;41:213-23. https://doi.org/10.18814/epiiugs/2018/018016
Two-step human–environmental impact history for northern New Zealand linked to late-Holocene climate change
Following resolution of a long-standing debate over the timing of the initial settlement of New Zealand from Polynesia (late 13th century), a prevailing paradigm has developed that invokes rapid transformation of the landscape, principally by fire, within a few decades of the first arrivals. This model has been constructed from evidence mostly from southern and eastern regions of New Zealand, but a more complicated pattern may apply in the more h…
Pollen-based temperature and precipitation records of the past 14,600 years in northern New Zealand (37°S) and their linkages with the Southern Hemisphere atmospheric circulation
Regional vegetation, climate history, and local water table fluctuations for the past 14,600 years are reconstructed from pollen and charcoal records of an ombrogenous peatbog in northern New Zealand (38°S). A long-term warming trend between 14,600 and 10,000 cal. yr BP is punctuated by two brief plateaux between 14,200–13,800 and 13,500–12,000 cal. yr BP. Periods of relatively drier conditions are inferred between 14,000–13,400 and 12,000–10,000…
Holocene history of a raised bog, northern New Zealand, based on plant cuticles
We present a method for analysing subfossil plant cuticles preserved in peat and apply the method to provide a preliminary, coarse resolution reconstruction of Holocene vegetation history at Moanatuatua Bog, northern North Island, New Zealand. The plant cuticle record reveals the early-Holocene development of a swamp and its transition to a raised bog, which is not apparent from other proxies. Comparison with a pollen record from the same sequenc…
Formal subdivision of the Holocene Series/Epoch
This discussion paper, by a Working Group of INTIMATE (Integration of ice‐core, marine and terrestrial records) and the Subcommision on Quaternary Stratigraphy (SQS) of the International Commission on Stratigraphy (ICS), considers the prospects for a formal subdivision of the Holocene Series/Epoch. Although previous attempts to subdivide the Holocene have proved inconclusive, recent developments in Quaternary stratigraphy, notably the definition …
Formal definition and dating of the GSSP (Global Stratotype Section and Point) for the base of the Holocene using the Greenland NGRIP ice core, and selected auxiliary records
The Greenland ice core from NorthGRIP (NGRIP) contains a proxy climate record across the Pleistocene–Holocene boundary of unprecedented clarity and resolution. Analysis of an array of physical and chemical parameters within the ice enables the base of the Holocene, as reflected in the first signs of climatic warming at the end of the Younger Dryas/Greenland Stadial 1 cold phase, to be located with a high degree of precision. This climatic event i…
Timing of the late-glacial climate reversal in the Southern Hemisphere using high-resolution radiocarbon chronology for Kaipo Bog, New Zealand
The pattern of climate change in the Southern Hemisphere during the Younger Dryas (YD) chronozone provides essential constraint on mechanisms of abrupt climate change only if accurate, high-precision chronologies are obtained. A climate reversal reported previously at Kaipo bog, New Zealand, had been dated between 13,600 and 12,600 cal yr B.P. and appeared to asynchronously overlap the YD chron, but the chronology, based on conventionally radioca…
A continuous 5300-yr Holocene cryptotephrostratigraphic record from northern New Zealand and implications for tephrochronology and volcanic hazard assessment
A continuous ∼5280 calendar (cal.) yr long cryptotephrostratigraphic record of a peat core from northern New Zealand demonstrates that cryptotephra studies can enhance conventional tephra records by extending the known distribution of ash fall and enabling re-assessment of volcanic hazards. A systematic sampling strategy was used to locate peaks in glass-shard concentrations and to determine loci of individual geochemical populations, and a palyn…
A wiggle-match date for Polynesian settlement of New Zealand
Dating initial colonisation and environmental impacts by Polynesians in New Zealand is controversial. A key horizon is provided by the Kaharoa Tephra, deposited from an eruption of Mt Tarawera, because just underneath this layer are the first signs of forest clearance which imply human settlement. The authors used a log of celery pine from within Kaharoa deposits to derive a new precise date for the eruption via “wiggle-matching” – matching the r…
Rapid sea-level rise in the Gulf of Maine, USA, since AD 1800
Two sea-level records from salt marshes in coastal Maine are derived from foraminiferal analyses and AMS 14 C, 210 Pb, 137 Cs and pollen chronology. Both records cover the period from AD 800 until the present and show corresponding patterns of sea-level change when corrected for trends which could accommodate millennial-scale isostatic adjustments. The records provide a detailed sea-level chronology for the last few centuries and thus link the in…
Tephras and New Zealand Archaeology
Environmental change in Northland, New Zealand during the last glacial and Holocene
A late-Holocene and prehistoric record of environmental change from Lake Waikaremoana, New Zealand
Further evidence in support of a late pre-European (Polynesian) settlement of New Zealand is pro vided by an 1850-year-long tephropalynological record from a remote region in New Zealand's North Island. The earliest unequivocally anthropogenic forest clearance is estimated from sedimentation rates to have occurred c. 375 14 C years BP (c. ad 1523–1631), although the radiocarbon chronology, shown by tephrochron ology to be erroneous due to hard-wa…
An Evaluation of the Use of Internet Sources as a Basis for Geography Coursework
Use of the Internet is proliferating rapidly, with mounting speculation as to the practical applications for teaching in higher (and other sectors of) education, yet few published or evaluated case studies are available. This paper explores the use of Internet sources on geography courses. For various academic, logistic and philosophical reasons that are discussed, students were not given full access to the Internet, but were exposed to a variety…
The Kaharoa Tephra as a Critical Datum for Earliest Human Impact in Northern New Zealand
Lecture reviews by students in groups
The benefits of conventionally reviewing or recapping lectures can be enhanced by allowing time in class for students to review lectures in small groups. Building this procedure into a lecture programme helps promote discussion, interaction and group activity, and provides opportunities for in‐course monitoring of both lecturer and student performance. Other benefits include a student‐authored course review document. Evaluation of this practice i…
Holocene vegetation, climate and history of a raised bog complex, northern New Zealand based on palynology, plant macrofossils and tephrochronology
A Holocene history of vegetation, climate, and ombrogenous mire development is presented from pollen and plant macrofossil analyses of sediments at Kopouatai Bog, a large, raised, restiad bog in northern New Zealand. Tephra layers of established ages, supplemented by numerous radiocarbon dates, provide a secure chronology. The earliest peats, overlying last glacial sediments, and dated at c. 11700 radiocarbon years BP, with extensive accumulation…
A Vegetation History of the Far North of New Zealand during the Late Otira (Last) Glaciation
During the latter part of the last (Otira) glaciation the forest cover of New Zealand was much reduced. It has frequently been postulated, however, that diverse mixed forest communities survived in the far north of North Island. Pollen diagrams and radiocarbon dates from two last glacial and postglacial (Aranuian) sits on the Aupouri Peninsula in the far north of New Zealand are compared with other published palynological and plant macrofossil ev…
Climatic Implications of Macro- and Microfossil Assemblages from Late Pleistocene Deposits in Northern New Zealand
Twenty-two plant species were identified from leaves, fruits, or flowers, and 41 taxa from pollen, present in a macrofossil (leaf) layer in a peat swamp formed on Pleistocene dunes on the Aupouri Peninsula in northern New Zealand. Eight genera of gymnosperms are represented. With the exception of Lagarostrobos colensoi, all tree species abundant as macrofossils are also common as pollen. Macrofossils enabled the on-site flora to be compared with …
The Kaharoa Tephra as a Critical Datum for Earliest Human Impact in Northern New Zealand
Tephras and New Zealand Archaeology
Rapid sea-level rise in the Gulf of Maine, USA, since AD 1800
Two sea-level records from salt marshes in coastal Maine are derived from foraminiferal analyses and AMS 14 C, 210 Pb, 137 Cs and pollen chronology. Both records cover the period from AD 800 until the present and show corresponding patterns of sea-level change when corrected for trends which could accommodate millennial-scale isostatic adjustments. The records provide a detailed sea-level chronology for the last few centuries and thus link the in…
A late-Holocene and prehistoric record of environmental change from Lake Waikaremoana, New Zealand
Further evidence in support of a late pre-European (Polynesian) settlement of New Zealand is pro vided by an 1850-year-long tephropalynological record from a remote region in New Zealand's North Island. The earliest unequivocally anthropogenic forest clearance is estimated from sedimentation rates to have occurred c. 375 14 C years BP (c. ad 1523–1631), although the radiocarbon chronology, shown by tephrochron ology to be erroneous due to hard-wa…
A continuous 5300-yr Holocene cryptotephrostratigraphic record from northern New Zealand and implications for tephrochronology and volcanic hazard assessment
A continuous ∼5280 calendar (cal.) yr long cryptotephrostratigraphic record of a peat core from northern New Zealand demonstrates that cryptotephra studies can enhance conventional tephra records by extending the known distribution of ash fall and enabling re-assessment of volcanic hazards. A systematic sampling strategy was used to locate peaks in glass-shard concentrations and to determine loci of individual geochemical populations, and a palyn…
Holocene vegetation, climate and history of a raised bog complex, northern New Zealand based on palynology, plant macrofossils and tephrochronology
A Holocene history of vegetation, climate, and ombrogenous mire development is presented from pollen and plant macrofossil analyses of sediments at Kopouatai Bog, a large, raised, restiad bog in northern New Zealand. Tephra layers of established ages, supplemented by numerous radiocarbon dates, provide a secure chronology. The earliest peats, overlying last glacial sediments, and dated at c. 11700 radiocarbon years BP, with extensive accumulation…
An Evaluation of the Use of Internet Sources as a Basis for Geography Coursework
Use of the Internet is proliferating rapidly, with mounting speculation as to the practical applications for teaching in higher (and other sectors of) education, yet few published or evaluated case studies are available. This paper explores the use of Internet sources on geography courses. For various academic, logistic and philosophical reasons that are discussed, students were not given full access to the Internet, but were exposed to a variety…
Two-step human–environmental impact history for northern New Zealand linked to late-Holocene climate change
Following resolution of a long-standing debate over the timing of the initial settlement of New Zealand from Polynesia (late 13th century), a prevailing paradigm has developed that invokes rapid transformation of the landscape, principally by fire, within a few decades of the first arrivals. This model has been constructed from evidence mostly from southern and eastern regions of New Zealand, but a more complicated pattern may apply in the more h…
Lecture reviews by students in groups
The benefits of conventionally reviewing or recapping lectures can be enhanced by allowing time in class for students to review lectures in small groups. Building this procedure into a lecture programme helps promote discussion, interaction and group activity, and provides opportunities for in‐course monitoring of both lecturer and student performance. Other benefits include a student‐authored course review document. Evaluation of this practice i…
A Vegetation History of the Far North of New Zealand during the Late Otira (Last) Glaciation
During the latter part of the last (Otira) glaciation the forest cover of New Zealand was much reduced. It has frequently been postulated, however, that diverse mixed forest communities survived in the far north of North Island. Pollen diagrams and radiocarbon dates from two last glacial and postglacial (Aranuian) sits on the Aupouri Peninsula in the far north of New Zealand are compared with other published palynological and plant macrofossil ev…
Climatic Implications of Macro- and Microfossil Assemblages from Late Pleistocene Deposits in Northern New Zealand
Twenty-two plant species were identified from leaves, fruits, or flowers, and 41 taxa from pollen, present in a macrofossil (leaf) layer in a peat swamp formed on Pleistocene dunes on the Aupouri Peninsula in northern New Zealand. Eight genera of gymnosperms are represented. With the exception of Lagarostrobos colensoi, all tree species abundant as macrofossils are also common as pollen. Macrofossils enabled the on-site flora to be compared with …
Holocene vegetation, climate and history of a raised bog complex, northern New Zealand based on palynology, plant macrofossils and tephrochronology
A Holocene history of vegetation, climate, and ombrogenous mire development is presented from pollen and plant macrofossil analyses of sediments at Kopouatai Bog, a large, raised, restiad bog in northern New Zealand. Tephra layers of established ages, supplemented by numerous radiocarbon dates, provide a secure chronology. The earliest peats, overlying last glacial sediments, and dated at c. 11700 radiocarbon years BP, with extensive accumulation…
Lecture reviews by students in groups
The benefits of conventionally reviewing or recapping lectures can be enhanced by allowing time in class for students to review lectures in small groups. Building this procedure into a lecture programme helps promote discussion, interaction and group activity, and provides opportunities for in‐course monitoring of both lecturer and student performance. Other benefits include a student‐authored course review document. Evaluation of this practice i…
A late-Holocene and prehistoric record of environmental change from Lake Waikaremoana, New Zealand
Further evidence in support of a late pre-European (Polynesian) settlement of New Zealand is pro vided by an 1850-year-long tephropalynological record from a remote region in New Zealand's North Island. The earliest unequivocally anthropogenic forest clearance is estimated from sedimentation rates to have occurred c. 375 14 C years BP (c. ad 1523–1631), although the radiocarbon chronology, shown by tephrochron ology to be erroneous due to hard-wa…
An Evaluation of the Use of Internet Sources as a Basis for Geography Coursework
Use of the Internet is proliferating rapidly, with mounting speculation as to the practical applications for teaching in higher (and other sectors of) education, yet few published or evaluated case studies are available. This paper explores the use of Internet sources on geography courses. For various academic, logistic and philosophical reasons that are discussed, students were not given full access to the Internet, but were exposed to a variety…
The Kaharoa Tephra as a Critical Datum for Earliest Human Impact in Northern New Zealand
Environmental change in Northland, New Zealand during the last glacial and Holocene
Tephras and New Zealand Archaeology
Rapid sea-level rise in the Gulf of Maine, USA, since AD 1800
Two sea-level records from salt marshes in coastal Maine are derived from foraminiferal analyses and AMS 14 C, 210 Pb, 137 Cs and pollen chronology. Both records cover the period from AD 800 until the present and show corresponding patterns of sea-level change when corrected for trends which could accommodate millennial-scale isostatic adjustments. The records provide a detailed sea-level chronology for the last few centuries and thus link the in…
A wiggle-match date for Polynesian settlement of New Zealand
Dating initial colonisation and environmental impacts by Polynesians in New Zealand is controversial. A key horizon is provided by the Kaharoa Tephra, deposited from an eruption of Mt Tarawera, because just underneath this layer are the first signs of forest clearance which imply human settlement. The authors used a log of celery pine from within Kaharoa deposits to derive a new precise date for the eruption via “wiggle-matching” – matching the r…
Timing of the late-glacial climate reversal in the Southern Hemisphere using high-resolution radiocarbon chronology for Kaipo Bog, New Zealand
The pattern of climate change in the Southern Hemisphere during the Younger Dryas (YD) chronozone provides essential constraint on mechanisms of abrupt climate change only if accurate, high-precision chronologies are obtained. A climate reversal reported previously at Kaipo bog, New Zealand, had been dated between 13,600 and 12,600 cal yr B.P. and appeared to asynchronously overlap the YD chron, but the chronology, based on conventionally radioca…
A continuous 5300-yr Holocene cryptotephrostratigraphic record from northern New Zealand and implications for tephrochronology and volcanic hazard assessment
A continuous ∼5280 calendar (cal.) yr long cryptotephrostratigraphic record of a peat core from northern New Zealand demonstrates that cryptotephra studies can enhance conventional tephra records by extending the known distribution of ash fall and enabling re-assessment of volcanic hazards. A systematic sampling strategy was used to locate peaks in glass-shard concentrations and to determine loci of individual geochemical populations, and a palyn…
Formal definition and dating of the GSSP (Global Stratotype Section and Point) for the base of the Holocene using the Greenland NGRIP ice core, and selected auxiliary records
The Greenland ice core from NorthGRIP (NGRIP) contains a proxy climate record across the Pleistocene–Holocene boundary of unprecedented clarity and resolution. Analysis of an array of physical and chemical parameters within the ice enables the base of the Holocene, as reflected in the first signs of climatic warming at the end of the Younger Dryas/Greenland Stadial 1 cold phase, to be located with a high degree of precision. This climatic event i…
Formal subdivision of the Holocene Series/Epoch
This discussion paper, by a Working Group of INTIMATE (Integration of ice‐core, marine and terrestrial records) and the Subcommision on Quaternary Stratigraphy (SQS) of the International Commission on Stratigraphy (ICS), considers the prospects for a formal subdivision of the Holocene Series/Epoch. Although previous attempts to subdivide the Holocene have proved inconclusive, recent developments in Quaternary stratigraphy, notably the definition …
Holocene history of a raised bog, northern New Zealand, based on plant cuticles
We present a method for analysing subfossil plant cuticles preserved in peat and apply the method to provide a preliminary, coarse resolution reconstruction of Holocene vegetation history at Moanatuatua Bog, northern North Island, New Zealand. The plant cuticle record reveals the early-Holocene development of a swamp and its transition to a raised bog, which is not apparent from other proxies. Comparison with a pollen record from the same sequenc…
Pollen-based temperature and precipitation records of the past 14,600 years in northern New Zealand (37°S) and their linkages with the Southern Hemisphere atmospheric circulation
Regional vegetation, climate history, and local water table fluctuations for the past 14,600 years are reconstructed from pollen and charcoal records of an ombrogenous peatbog in northern New Zealand (38°S). A long-term warming trend between 14,600 and 10,000 cal. yr BP is punctuated by two brief plateaux between 14,200–13,800 and 13,500–12,000 cal. yr BP. Periods of relatively drier conditions are inferred between 14,000–13,400 and 12,000–10,000…
Formal ratification of the subdivision of the Holocene Series/Epoch (Quaternary System/Period)
Mike Walker, Martin J. Head, Max Berkelhammer, Svante Björck, Hai Cheng, Les Cwynar, David Fisher, Vasilios Gkinis, Antony Long, John Lowe, Rewi Newnham, Sune Olander Rasmussen, Harvey Weiss. Episodes 2018;41:213-23. https://doi.org/10.18814/epiiugs/2018/018016
Two-step human–environmental impact history for northern New Zealand linked to late-Holocene climate change
Following resolution of a long-standing debate over the timing of the initial settlement of New Zealand from Polynesia (late 13th century), a prevailing paradigm has developed that invokes rapid transformation of the landscape, principally by fire, within a few decades of the first arrivals. This model has been constructed from evidence mostly from southern and eastern regions of New Zealand, but a more complicated pattern may apply in the more h…
Geology and Paleoclimatology Research (16 works) · Geography (14 works) · Geology (11 works) · Physical geography (11 works) · Paleontology (10 works) · Radiocarbon dating (10 works) · Archaeology (9 works) · Holocene (9 works) · Oceanography (8 works) · Chronology (7 works)