Results 141 to 150 of about 2,135 (180)

A high-resolution tephrostratigraphy from Quoyloo Meadow, Orkney, Scotland: Implications for the tephrostratigraphy of NW Europe during the Last Glacial-Interglacial Transition

Quaternary Geochronology, 2017
Abstract Macro- and crypto-tephra layers deposited in European climate archives during the Last Glacial-Interglacial Transition (LGIT ca. 16–8 ka) have become increasingly important as a means to robustly correlate palaeoclimate records, and to test the spatial and temporal synchronicity of climatic transitions.
Rhys Timms
exaly   +2 more sources

Holocene tephrostratigraphy in Vestfirðir, NW Iceland

Journal of Quaternary Science, 2018
ABSTRACTWe present a tephra stratigraphical and tephrochronological record from eight lakes in Vestfirðir, NW Iceland. About 50 tephra units have been identified, representing nearly 30 eruptive events originating from five volcanic systems: Hekla, Katla, Snæfellsjökull, Grímsvötn and Veiðivötn‐Bárðarbunga.
Gudmundsdóttir, Esther Ruth, Schomacker, Anders, Brynjólfsson, Skafti, Ingólfsson, Ólafur, Larsen, Nicolaj K.   +4 more
openaire   +2 more sources

Late Quaternary tephrostratigraphy, Ahklun Mountains, SW Alaska

Journal of Quaternary Science, 2012
AbstractRadiocarbon‐dated sediment cores from six lakes in the Ahklun Mountains, south‐western Alaska, were used to interpolate the ages of late Quaternary tephra beds ranging in age from 25.4 to 0.4 ka. The lakes are located downwind of the Aleutian Arc and Alaska Peninsula volcanoes in the northern Bristol Bay area between 159° and 161°W at around 60°
Kaufman, D.S., Jensen, B.J.L., Reyes, A.V., Schiff, C.J., Froese, D.G., Pearce, N.J.G.   +5 more
openaire   +2 more sources

Testing the synchroneity of pollen signals using tephrostratigraphy

Global and Planetary Change, 1999
Abstract Since the advent of radiocarbon dating, the concept of synchronous pollen-vegetation events extending across broad regions such as the British Isles, which had emerged from earlier pollen-stratigraphic studies, has been largely refuted. Nevertheless the assumption that pollen profiles within a geographically coherent area should exhibit ...
Newnham, Rewi M., Lowe, David J.
openaire   +2 more sources

Tephrostratigraphy and geological context in paleoanthropology

Evolutionary Anthropology: Issues, News, and Reviews, 1999
The fossiliferous and artifact-rich sites of East Africa, which are central to our understanding of early hominid evolution, also preserve a detailed record of explosive volcanism. The products of these eruptions, ash, lapilli, and pumice, are collectively known as tephra.
openaire   +1 more source

Late pleistocene tephrostratigraphy in the Taupo district, New Zealand

New Zealand Journal of Geology and Geophysics, 1976
Abstract Late Pleistocene rhyolitic tephras erupted in the period c. 20000–42000 years B.P. and preserved in the Taupo district have been mapped and described with reference to their field appearance and stratigraphic sequence. Five new formations of tephras erupted from the Taupo Volcanic Centre are defined; they are, from youngest to oldest: Poihipi,
C. G. Vucetich, R. Howorth
openaire   +1 more source

Tephrochronology and tephrostratigraphy of two Pleistocene continental fossiliferous successions from central Italy

Journal of Quaternary Science, 2003
AbstractThe stratigraphical context of two Middle Pleistocene fossiliferous palaeosols from Central Italy (Abruzzo and Tuscany) have been studied. Small mammals and molluscs occur in both palaeosols, which are covered by tephra layers that were analysed using an interdisciplinary approach.
F. Marcolini, G. Bigazzi, FP Bonadonna, E. Centamore, CIONI, RAFFAELLO, G. Zanchetta   +5 more
openaire   +2 more sources

Early and late Holocene glacial fluctuations and tephrostratigraphy, Cabin Lake, Alaska

Journal of Quaternary Science, 2013
ABSTRACTMarked changes in sediment types deposited in Cabin Lake, near Cordova, Alaska, represent environmental shifts during the early and late Holocene, including fluctuations in the terminal position of Sheridan Glacier. Cabin Lake is situated to receive meltwater during periods when the outwash plain of the advancing Sheridan Glacier had aggraded ...
PAUL D. ZANDER, DARRELL S. KAUFMAN, STEPHEN C. KUEHN, KRISTI L. WALLACE, R. SCOTT ANDERSON   +4 more
openaire   +1 more source

Tephrostratigraphy of the Chemeron Formation Baringo Basin, Kenya

2012
The Baringo Basin, in the northern Rift Valley of Kenya, has long been a focus of interest for various academic disciplines. Its deposits, ranging in age from the Miocene to the Pleistocene, with mammalian fossil localities have not only provided an opportunity for intensive study but have also raised hopes for the area as a possible source for ...
openaire   +1 more source

A Late Younger Dryas–Early Holocene tephrostratigraphy for Fosen, Central Norway

Journal of Quaternary Science, 2013
ABSTRACTA number of rapid climate oscillations occur during the Lateglacial–Early Holocene, 15–8 ka BP period and a well‐developed tephrostratigraphy in association with these oscillations increases the possibilities to correlate climate archives around the North Atlantic.
Lind, Ewa M., Wastegard, Stefan, Larsen, Jeppe J.   +2 more
openaire   +2 more sources