Results 51 to 60 of about 5,095 (245)

Role of tephra in dating Polynesian settlement and impact, New Zealand [PDF]

open access: yes, 2004
Tephrochronology in its original sense is the use of tephra layers as time-stratigraphic marker beds to establish numerical or relative ages (Lowe and Hunt, 2001).
Lowe, David J., Newnham, Rewi M.
core   +2 more sources

Isochronous Miocene volcaniclastic horizon in the SW Tarim Basin: Composition, ages, origins, and implications for tephrochronology

open access: yesGeological Society of America Bulletin
Volcaniclastic rocks offer insights into magmatic and tectonic activity and a means to constrain depositional age by radioisotopic dating. However, these tasks can be challenging.
Xiaochun Wei   +7 more
semanticscholar   +1 more source

A review of late Quaternary silicic and some other tephra formations from New Zealand: their stratigraphy, nomenclature, distribution, volume, and age. [PDF]

open access: yes, 1990
The stratigraphic relationships and distribution of 36 named late Quaternary (≤c. 50 000 yr B P.) silicic tephra formations, erupted from 4 volcanic centres—Okataina, Taupo, Maroa, and Tuhua (Mayor Island)—are presented.
Froggatt, Paul C., Lowe, David J.
core   +2 more sources

Early Holocene jökulhlaup chronology and deglaciation dynamics in central Iceland

open access: yesBoreas, EarlyView.
Glacial lake outburst floods (jökulhlaups) have occurred throughout the Quaternary in glaciated regions worldwide. Reconstructing flood chronology yields insight into deglaciation processes, environmental change and the role of extreme events in landscape evolution.
Greta H. Wells   +4 more
wiley   +1 more source

Stop 2 Kainui silt loam and Naike clay, Gordonton Rd [PDF]

open access: yes, 2008
At this stop are several remarkable features both stratigraphic and pedological, and a “two-storied” soil, the Kainui silt loam alongside (in just a few places) the Naike clay. Both soils are Ultisols. The sequence of tephra beds and buried soil horizons
Lowe, David J.
core   +3 more sources

Variable preservation of the 1991 Hudson tephra in small lakes and on land

open access: yesFrontiers in Earth Science
Volcanic ash (tephra) preserved in terrestrial environments and lake sediments contains information about volcanic processes and can be used to infer eruptive parameters and frequency of past eruptions, contributing to the understanding of volcanic ...
Richard T. Streeter   +5 more
doaj   +1 more source

Tephrochronological evidence for the late Holocene eruption history of El Chichón Volcano, Mexico [PDF]

open access: yesGeofísica Internacional, 2009
Pre-Columbian societies in the Maya Lowlands were repeatedly exposed to tephra-fall from past eruptions of El Chichón volcano, Chiapas, Mexico. Late Holocene tephra layers are well preserved in sediments of the Usumacinta-Grijalva river delta, about 150 ...
A. L. Martin Del Pozzo   +3 more
doaj  

Development of a multi-method chronology spanning the Last Glacial Interval from Orakei maar lake, Auckland, New Zealand [PDF]

open access: yesGeochronology, 2020
Northern New Zealand is an important location for understanding Last Glacial Interval (LGI) palaeoclimate dynamics, since it is influenced by both tropical and polar climate systems which have varied in relative strength and timing.
L. Peti   +10 more
doaj   +1 more source

Connecting with tephras: principles, functioning, and applications of tephrochronology in Quaternary science [PDF]

open access: yes, 2013
Tephrochronology is a unique method for linking and dating geological, palaeoecological, palaeoclimatic, or archaeological sequences or events. The method relies firstly on stratigraphy and the law of superposition, which apply in any study that connects
Lowe, David J.
core   +1 more source

Late‐Holocene evolution of a small Sub‐Arctic glacier, Gljúfurárjökull (Tröllaskagi, northern Iceland)

open access: yesBoreas, EarlyView.
Gljúfurárjökull, located on the Tröllaskagi Peninsula in northern Iceland, is a small glacier approximately 3.8 km in length. This study analyses the glacier's evolution through a combination of methods including: (i) geomorphological mapping, (ii) Cosmic‐Ray Exposure (CRE) dating, (iii) lichenometry and (iv) palaeoglacier reconstruction (volume ...
Nuria Andrés   +14 more
wiley   +1 more source

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