Results 81 to 90 of about 17,704 (249)

Reconnaissance study of macrofossils from the upper purus river - Western Amazônia. [PDF]

Acta Amazonica, 1986
Fossils of wood, bone and teeth found along the Upper Purus River οf Amazonia. were studied using conventional microscopy and scanning electron microscopy.
R. E. Benchimol, K. Cooper, Kronberg B.I., M. Powell   +3 more
doaj   +1 more source

Sedimentary ancient DNA from Lake Skartjorna, Svalbard: assessing the resilience of arctic flora to Holocene climate change [PDF]

, 2015
Reconstructing past vegetation and species diversity from arctic lake sediments can be challenging because of low pollen and plant macrofossil concentrations. Information may be enhanced by metabarcoding of sedimentary ancient DNA (sedaDNA). We developed
Alsos, I.G., Brown, A.G., Coissac, E., Edwards, M.E., Foreid, M.K., Forwick, M., Gielly, L., Jakobsen, L.V., Landvik, J.Y., Pedersen, M.W., Sjogren, Per   +10 more
core   +2 more sources

Pan‐Arctic Peatlands Have Expanded During Recent Warming

Global Change Biology, Volume 32, Issue 2, February 2026.
Arctic peatland carbon is important because it represents a large carbon stock that may be vulnerable to climate change. This work explores the expansion and/or shrinkage of Arctic peatlands using observations in two north–south transects in Canada and in Europe.
J. Handley, R. E. Fewster, T. G. Sim, S. Hodson, B. Parker, K. Crichton, D. Charman, K. Anderson, M. Garneau, M. Väliranta, D. W. Beilman, G. T. Swindles, M. Aquino‐López, M. Blaauw, X. Comas, E. Levesque, V. Maire, H. Addis, M. Amesbury, D. Fortier, M. Mleczko, A. Gallego‐Sala   +21 more
wiley   +1 more source

Was Scotland deglaciated during the Younger Dryas? [PDF]

, 2016
Recent work has produced data that challenges the canonical view that the Younger Dryas (c.12.9–11.7 ka) was a time of glacier expansion across the North Atlantic. Boulders on moraines located within the inner sector of the Scottish Loch Lomond Stadial (≈
Fabel, Derek, Small, David
core   +1 more source

Ichnological insights into deoxygenation across the Cenomanian–Turonian Boundary Oceanic Anoxic Event 2 in the northern extent of Western Interior Seaway (west‐central Alberta)

Sedimentology, Volume 73, Issue 2, Page 355-390, February 2026.
ABSTRACT In‐depth ichnological and sedimentological analyses of the Cenomanian–Turonian boundary Oceanic Anoxic Event (OAE2) from the Western Interior Seaway of west‐central Alberta reveal a persistent physico‐chemically stressed setting. The interval is characterised by a dominantly diminutive and diminished ichnological assemblage, with familiar ...
Sara K. Biddle, Murray K. Gingras
wiley   +1 more source

Aquatic Ecosystem Deterioration and Its Potential Drivers in a Floodplain Lake in the Lower Yellow River Area, North China

Ecology and Evolution, Volume 16, Issue 1, January 2026.
This study employed Landsat imagery and Support Vector Machine to extract spring and summer aquatic vegetation distribution in Dongping Lake, combined with field survey data and environmental factors to analyze its succession over the past 40 years. Redundancy Analysis was then used to investigate the factors driving aquatic ecosystem deterioration ...
Yingying Chen, Yanyu Ji, Qinghui Zhang, Yunwei Zhang, Shi‐Yong Yu, Shiyue Chen   +5 more
wiley   +1 more source

Macrofossil evidence for a rapid and severe Cretaceous–Paleogene mass extinction in Antarctica

Nature Communications, 2016
Debate surrounds the causes, timing, and effects of the Cretaceous-Paleogene mass extinction, 66 Ma. Here, using new collections of marine macrofossils from Seymour Island, Antarctica, the authors show that the extinction was both rapid and severe in the
James D. Witts, Rowan J. Whittle, Paul B. Wignall, J. Alistair Crame, Jane E. Francis, Robert J. Newton, Vanessa C. Bowman   +6 more
doaj   +1 more source

A multiple profile approach to the palynological reconstruction of Norse landscapes in Greenland's Eastern Settlement [PDF]

, 2014
Acknowledgments The Leverhulme Trust is thanked for financial support. Gordon Cook provided radiocarbon dates. Thanks are also due to Andy McMullen for botanical identifications and assistance in the field, and to Sikuu Motzfeld for hospitality during ...
Edwards, Kevin J, Ledger, Paul M, Schofield, J. Edward   +2 more
core   +1 more source

The Soil Erosion Paradox Re‐Examined: Alluviation and Land Use History in a Small British Lowland River Catchment in the Late Holocene

Geoarchaeology, Volume 41, Issue 1, January/February 2026.
ABSTRACT Modern studies show that soil erosion results in a loss of ecosystem function, particularly fertility, and is a cause of declining agricultural yields. However, despite the well‐attested high rates of soil erosion across Roman and medieval Europe there appears to have been little or no soil‐associated decline in agricultural production—the ...
Ben Pears, Emily Forster, Sam Hudson, Jayne Carroll, Richard Jones, Antony G. Brown   +5 more
wiley   +1 more source

Early to Mid Wisconsin fluvial deposits and palaeoenvironment of the Kidluit Formation, Tuktoyaktuk Coastlands, western Arctic Canada [PDF]

, 2017
The Kidluit Formation (Fm) is a fluvial sand deposit that extends regionally across the Tuktoyaktuk Coastlands, western Arctic Canada. It was deposited by a large river flowing north into the Arctic Ocean prior to development of a cold-climate sandy ...
Anderson, Anderson, Bateman, Bateman, Birks, Chernov, Dallimore, Demuro, Demuro, Duk-Rodkin, Duk-Rodkin, Dyke, Hill, Hultén, Johnson, Kennedy, Lacelle, Larson, Lauriol, Mackay, Mackay, Mackay, Mackay, Mackay, Majka, Murray, Murton, Murton, Murton, Murton, Murton, Porsild, Prescott, Rampton, Rampton, Roberts, Taylor, Taylor, Terrain Analysis & Mapping Services Limited (TAMSL)   +38 more
core   +2 more sources