Results 151 to 160 of about 1,251 (191)

The Lithofacies of Sandstones Interbedded with Shales: Implication for Organic Matter Accumulation of Triassic Deep Lacustrine Setting, Southern Ordos Basin. [PDF]

ACS Omega
Pang Q, Hu G, Hu C, Meng F, Wang B, Zhang J.   +5 more
europepmc   +1 more source

Did the AD 853 Mount Churchill eruption trigger societal and climatic impacts in the northern mid-latitudes? [PDF]

, 2017
Blundell, Antony, Booth, Robert, Hughes, Paul, Jensen, Britta, Mackay, Helen, Plunkett, Gill, Swindles, Graeme   +6 more
core  

Downward migrating microplastics in lake sediments are a tricky indicator for the onset of the Anthropocene. [PDF]

Sci Adv
Dimante-Deimantovica I, Saarni S, Barone M, Buhhalko N, Stivrins N, Suhareva N, Tylmann W, Vianello A, Vollertsen J.   +8 more
europepmc   +1 more source

Detection of the Askja AD 1875 cryptotephra in Latvia, Eastern Europe [PDF]

Journal of Quaternary Science, 2016
ABSTRACTWe report the first geochemically confirmed findings of the Askja volcano (Iceland) AD 1875 eruption cryptotephra in Eastern Europe. The cryptotephra finding in Latvia is the easternmost finding of the Askja AD 1875 so far, providing an important time marker in the sediments.
Normunds Stivrins, Sabine Wulf, Stefan Wastegård   +2 more
exaly   +6 more sources

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A new early Holocene cryptotephra from northwest Scotland

Journal of Quaternary Science, 2005
AbstractClarification of the temporal relationships amongst records of environmental change is dependent on accurate timescales. Event markers such as tephra layers are extremely important for constraining chronologies and providing tie points. In this report we present evidence of a previously unknown early Holocene Icelandic cryptotephra from a lake ...
Brian Huntley, A Rus Hoelzel
exaly   +2 more sources

Ultra-distal Kamchatkan ash on Arctic Svalbard: Towards hemispheric cryptotephra correlation [PDF]

Quaternary Science Reviews, 2017
Rapidly deposited and geochemically distinct volcanic ash (tephra) markers represent a powerful chronological tool that enables precise dating and correlation of geological archives. Recent analytical advances now allow fingerprinting of non-visible ash (cryptotephra) over thousands of kilometers.
Willem Gm Van Der Bilt, Christine S Lane, Jostein Bakke   +2 more
exaly   +2 more sources

A mid to late Holocene cryptotephra framework from eastern North America

Quaternary Science Reviews, 2016
Abstract Holocene cryptotephras of Alaskan and Pacific Northwestern origin have recently been detected ca. 7000 km away on the east coast of North America. This study extends the emerging North American tephrochronological framework by geochemically characterising seventeen cryptotephra layers from four newly explored peatlands.
Helen Mackay, Britta J L Jensen, Sean D F Pyne-O'donnell   +2 more
exaly   +5 more sources

Locating cryptotephra in lake sediments using fluid imaging technology

Journal of Paleolimnology, 2014
We report a new approach to locate and quantify cryptotephra in sedimentary archives using a continuously-imaging Flow Cytometer and Micro- scope (FlowCAM). The FlowCAM rapidly photo- graphs particles flowing in suspension past a microscope lens and performs semi-automated ana- lysis of particle images.
Robert M. D’Anjou, Nicholas L. Balascio, Raymond S. Bradley   +2 more
openaire   +1 more source

Cryptotephra sedimentation processes within two lacustrine sequences from west central Sweden

Holocene, 2007
Distal tephra horizons, particularly within lacustrine sequences, are increasingly being used as time-synchronous marker horizons within palaeoclimatic and palaeoenvironmental investigations. As sedimentary features marking the presence of these so-called cryptotephras are absent to the naked eye, it is of some importance that the stratigraphic ...
Siwan M Davies, Jonas Bergman, Barbara Wohlfarth   +2 more
exaly   +4 more sources