Results 21 to 30 of about 1,251 (191)

Berriasian–Valanginian Geochronology and Carbon-Isotope Stratigraphy of the Yellow Cat Member, Cedar Mountain Formation, Eastern Utah, USA

Geosciences, 2023
The Early Cretaceous Yellow Cat Member of the terrestrial Cedar Mountain Formation in Utah, USA. has been interpreted as a “time-rich” unit because of its dinosaur fossils, prominent paleosols, and the results of preliminary chemostratigraphic and ...
Robert M. Joeckel, Celina A. Suarez, Noah M. McLean, Andreas Möller, Gregory A. Ludvigson, Marina B. Suarez, James I. Kirkland, Joseph Andrew, Spencer Kiessling, Garrett A. Hatzell   +9 more
doaj   +1 more source

The role of cryptotephra in refining the chronology of Late Pleistocene human evolution and cultural change in North Africa [PDF]

, 2015
© 2014.Sites in North Africa hold key information for dating the presence of Homo sapiens and the distribution of Middle Stone Age (MSA), Middle Palaeolithic (MP) and Later Stone Age (LSA) cultural activity in the Late Pleistocene.
Albert, PG, Barton, RNE, Bouzouggar, A, Collcutt, SN, Ditchfield, P, Farr, L, Kindermann, K, Lane, CS, Oh, A, Ottolini, L, Smith, VC, Van Peer, P, White, D   +12 more
core   +7 more sources

Environmental and Oceanographic Conditions at the Continental Margin of the Central Basin, Northwestern Ross Sea (Antarctica) Since the Last Glacial Maximum

Geosciences, 2021
The continental margin is a key area for studying the sedimentary processes related to the advance and retreat of the Ross Ice Shelf (Antarctica); nevertheless, much remains to be investigated.
Fiorenza Torricella, Romana Melis, Elisa Malinverno, Giorgio Fontolan, Mauro Bussi, Lucilla Capotondi, Paola Del Carlo, Alessio Di Roberto, Andrea Geniram, Gerhard Kuhn, Boo-Keun Khim, Caterina Morigi, Bianca Scateni, Ester Colizza   +13 more
doaj   +1 more source

Cryptotephra of Lake Khorlakel (Northern Caucasus, Russia)

Limnology and Freshwater Biology, 2022
Abstract. A tephrochronological study of the core HOR-1 of bottom sediment from Lake Khorlakel, located 24 km northwest of the Elbrus summit, was carried out. The core was 253 cm length. Deposits are represented by interbedding of thin-layered loams and bio-mineral silt. Six intervals of increased content of cryptotephra from 37,000 to 111,000 shards g
Mazneva, E. A., Aleksandrin, M. Yu., Konstantinov, E. A., Ponomareva, V. V., Portnyagin, Maxim V., Borisov, D. G.   +5 more
openaire   +1 more source

Ultra-distal tephra deposits and Bayesian modelling constrain a variable marine radiocarbon offset in Placentia Bay, Newfoundland [PDF]

Geochronology, 2023
Radiocarbon dating marine sediments is complicated by the strongly heterogeneous age of ocean waters. Tephrochronology provides a well-established method to constrain the age of local radiocarbon reservoirs and more accurately calibrate dates.
A. J. Monteath, M. S. M. Bolton, J. Harvey, M.-S. Seidenkrantz, C. Pearce, B. Jensen   +5 more
doaj   +1 more source

Vedde Ash constrains Younger Dryas glacier re-advance and rapid glacio-isostatic rebound on Svalbard

Quaternary Science Advances, 2022
The distal deposition of tephra from explosive volcanism has the potential to geochronologically constrain sedimentary archives and landforms.
Wesley R. Farnsworth, Ólafur Ingólfsson, Erik S. Mannerfelt, Maarit H. Kalliokoski, Esther R. Guðmundsdóttir, Michael Retelle, Lis Allaart, Skafti Brynjólfsson, Mark F.A. Furze, Holt J. Hancock, Kurt H. Kjær, Anna J. Pieńkowski, Anders Schomacker   +12 more
doaj   +1 more source

A cryptotephra from the Upper Pleistocene volcanism of the Bas-Vivarais in the sedimentary infilling of the Chauvet-Pont d’Arc cave (Ardèche, France)

Comptes Rendus. Géoscience, 2021
A cryptotephra belonging to the Upper Pleistocene volcanism of the Bas-Vivarais was identified for the first time in the sedimentary infilling of the entrance area of the Chauvet-Pont d’Arc cave. This slightly reworked tephra fall is characterized by its
Pastre, Jean-François, Debard, Évelyne, Ferrier, Catherine, Fialin, Michel, Gély, Bernard, Kervazo, Bertrand, Maksud, Frédéric, Mokadem, Fatima, Nomade, Sébastien, Rividi, Nicolas, Saulnier-Copard, Ségolène   +10 more
doaj   +1 more source

A Millennial-Scale Tephra Event-Stratigraphic Record of the South China Sea since the Penultimate Interglacial

Lithosphere, 2022
Large volcanic eruptions have significant impacts on climate and environmental changes. The deposition of tephra in marine sediments may serve as an eruption recorder, but it has not been extensively studied in the western Pacific.
Weijia Feng, Jiawen Yang, Chuang Bao, Deming Kong, Min-Te Chen   +4 more
doaj   +1 more source

Cryptotephra from the Icelandic Veiðivötn 1477 CE eruption in a Greenland ice core: confirming the dating of volcanic events in the 1450s CE and assessing the eruption's climatic impact [PDF]

Climate of the Past, 2021
Volcanic eruptions are a key source of climatic variability, and reconstructing their past impact can improve our understanding of the operation of the climate system and increase the accuracy of future climate projections.
P. M. Abbott, G. Plunkett, C. Corona, N. J. Chellman, J. R. McConnell, J. R. Pilcher, M. Stoffel, M. Stoffel, M. Stoffel, M. Sigl   +9 more
doaj   +1 more source

Re-deposited cryptotephra layers in Holocene peats linked to anthropogenic activity [PDF]

The Holocene, 2013
Tephra layers can form useful age-equivalent stratigraphic markers for correlating palaeoenvironmental sequences and they provide information about the spatio-temporal nature of past volcanic ash fall events. The use of microscopic ‘cryptotephra’ layers has both increased the stratigraphic resolution of tephra sequences in proximal areas and extended ...
Swindles, Graeme T, Galloway, Jennifer, Outram, Zoe, Turner, Kathryn, Schofield, J Edward, Newton, Anthony J, Dugmore, Andrew J, Church, Mike J, Watson, Elizabeth J, Batt, Cathy, Bond, Julie, Edwards, Kevin J., Turner, Val, Bashford, Daniel   +13 more
openaire   +2 more sources