title: Long-term evolution of an Oligocene/Miocene maar lake from Otago, New Zealand

authors: Fox, Beth R.S.

subjects: Science & Technology

abstract: Foulden Maar is a highly resolved maar lake deposit from the South Island of New Zealand comprising laminated diatomite punctuated by numerous diatomaceous turbidites. Basaltic clasts found in debris flow deposits near the base of the cored sedimentary sequence yielded two new ⁴⁰Ar/³⁹Ar dates of 24.51 ± 0.24 and 23.38 ± 0.24 Ma (2σ). The younger date agrees within error with a previously published ⁴⁰Ar/³⁹Ar date of 23.17 ± 0.19 Ma from a basaltic dyke adjacent to the maar crater. The diatomite is inferred to have been deposited over several tens of thousands of years in the latest Oligocene/earliest Miocene, and may have been coeval with the period of rapid glaciation and subsequent deglaciation of Antarctica known as the Mi-1 event. Sediment magnetic properties and SEM measurements indicate that the magnetic signal is dominated by pseudo-single domain pyrrhotite. The most likely source of detrital pyrrhotite is schist country rock fragments from the inferred tephra ring created by the phreatomagmatic eruption that formed the maar. Variations in magnetic mineral concentration indicate a decrease in erosional input throughout the depositional period, suggesting long-term (tens of thousands of years) environmental change in New Zealand in the latest Oligocene/earliest Miocene.

text: Long-term evolution of an Oligocene/Miocene maar lake from Otago, New Zealand Foulden Maar is a highly resolved maar lake deposit from the South Island of New Zealand comprising laminated diatomite punctuated by numerous diatomaceous turbidites. Basaltic clasts found in debris flow deposits near the base of the cored sedimentary sequence yielded two new ⁴⁰Ar/³⁹Ar dates of 24.51 ± 0.24 and 23.38 ± 0.24 Ma (2σ). The younger date agrees within error with a previously published ⁴⁰Ar/³⁹Ar date of 23.17 ± 0.19 Ma from a basaltic dyke adjacent to the maar crater. The diatomite is inferred to have been deposited over several tens of thousands of years in the latest Oligocene/earliest Miocene, and may have been coeval with the period of rapid glaciation and subsequent deglaciation of Antarctica known as the Mi-1 event. Sediment magnetic properties and SEM measurements indicate that the magnetic signal is dominated by pseudo-single domain pyrrhotite. The most likely source of detrital pyrrhotite is schist country rock fragments from the inferred tephra ring created by the phreatomagmatic eruption that formed the maar. Variations in magnetic mineral concentration indicate a decrease in erosional input throughout the depositional period, suggesting long-term (tens of thousands of years) environmental change in New Zealand in the latest Oligocene/earliest Miocene.

year: 2015-01-01

title: Women’s and girls’ ADHD diagnosis journeys: A mother-daughter autoethnography

authors: Wheaton, Belinda

subjects: Health policy

abstract: Attention-deficit/hyperactivity disorder (ADHD) remains underidentified, underdiagnosed and undertreated in women and girls. Research exploring their diagnostic experiences across national contexts is limited, despite an urgent need for experience-based knowledge to address epistemic injustices in healthcare. Using a collaborative autoethnographic approach, this study examines the diagnosis journeys of a mother and daughter, both with ADHD. We focus on critical incidents in the daughter’s ADHD/dyslexia diagnosis journey over a decade, spanning childhood to adulthood and two health systems: England and Aotearoa New Zealand. Findings reveal how limited understanding of ADHD in girls/women, combined with co-occurring conditions, contributed to repeated missed or misdiagnoses by teachers, education psychologists, psychiatrists, paediatricians and general practitioners. A network of professionals across health and education settings acted as gatekeepers, often unintentionally hindering access to support. Moreover, the experiential knowledge of both women was frequently sidelined, perpetuating epistemic injustice. We discuss implications for policy and practice and highlight the value of lived experience in addressing systemic barriers to ADHD diagnosis, recognition and understanding for women and girls.

text: Women’s and girls’ ADHD diagnosis journeys: A mother-daughter autoethnography Attention-deficit/hyperactivity disorder (ADHD) remains underidentified, underdiagnosed and undertreated in women and girls. Research exploring their diagnostic experiences across national contexts is limited, despite an urgent need for experience-based knowledge to address epistemic injustices in healthcare. Using a collaborative autoethnographic approach, this study examines the diagnosis journeys of a mother and daughter, both with ADHD. We focus on critical incidents in the daughter’s ADHD/dyslexia diagnosis journey over a decade, spanning childhood to adulthood and two health systems: England and Aotearoa New Zealand. Findings reveal how limited understanding of ADHD in girls/women, combined with co-occurring conditions, contributed to repeated missed or misdiagnoses by teachers, education psychologists, psychiatrists, paediatricians and general practitioners. A network of professionals across health and education settings acted as gatekeepers, often unintentionally hindering access to support. Moreover, the experiential knowledge of both women was frequently sidelined, perpetuating epistemic injustice. We discuss implications for policy and practice and highlight the value of lived experience in addressing systemic barriers to ADHD diagnosis, recognition and understanding for women and girls.

year: 2026

title: The Control, environmental sustainability and information management of Maori land in New Zealand

authors: Morad, Munir

subjects: Maori land

abstract: An increase in Maori land claims and the subsequent settlement of a number of land confiscation grievances have prompted calls for change to the land management, cadastral and legal regimes in New Zealand. There is little expert agreement as to Me shape any such reforms should take, but environmental planners and Maori leaders have conceded the need for an overhaul of current land information management practices. Such reforms must aspire to being legally workable, culturally appropriate and environmentally sustainable.
Most land in New Zealand is subject to recent legislation (post-1984) which acknowledges concern for Maori cultural values and ancestral rights and environmental sustainability. The existence of this legislation and growing Maori involvement in formulating public policy for the management of land and environmental resources mean that Maori concepts of land management and sustainability are receiving increasing attention and are likely to influence the shape of future cadastral reforms for Maori lands.

text: The Control, environmental sustainability and information management of Maori land in New Zealand An increase in Maori land claims and the subsequent settlement of a number of land confiscation grievances have prompted calls for change to the land management, cadastral and legal regimes in New Zealand. There is little expert agreement as to Me shape any such reforms should take, but environmental planners and Maori leaders have conceded the need for an overhaul of current land information management practices. Such reforms must aspire to being legally workable, culturally appropriate and environmentally sustainable.
Most land in New Zealand is subject to recent legislation (post-1984) which acknowledges concern for Maori cultural values and ancestral rights and environmental sustainability. The existence of this legislation and growing Maori involvement in formulating public policy for the management of land and environmental resources mean that Maori concepts of land management and sustainability are receiving increasing attention and are likely to influence the shape of future cadastral reforms for Maori lands.

year: 1997