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Now showing items 21-40 of 201

Changing ideas on the identity and stratigraphic significance of the Sheep Creek tephra beds in Alaska and the Yukon Territory, northwestern North America

Westgate, John A.; Preece, S. J.; Froese, Duane G.; Pearce, Nicholas J. G.; Roberts, R. G.; Demuro, M.; Hart, W. K.; Perkins, William T. (2008-02)

Sheep Creek tephra (SCt) consists of inflated, rhyolitic pumice with abundant plagioclase and hornblende, lesser amounts of ferrian ilmenite and magnetite, and trace quantities of basaltic hornblende, augite, quartz, ...
Changing snow cover and the net mass balance of Storglaciaren, northern Sweden

Essery, Richard; Lucas, Richard M.; Evans, E. (2008-10-01)

The spatial and temporal variability of seasonal snow cover in glacierized catchments has important implications for the net mass balance of alpine glaciers. This study examines the relationship between changing snowpack ...
Characterisation and mapping of forest communities by clustering individual tree crowns

Bunting, Peter J.; Bean, Anthony R.; Lucas, Richard M.; Jones, Kirsten (2010-11-15)

For many years, the classification of forest communities and their associated species from airborne data (primarily aerial photography) has largely been through manual interpretation. With the development of digital imagery, ...
Characteristics of thermally transferred optically stimulated luminescence (TT-OSL) in quartz and its potential for dating sediments

Tsukamoto, Sumiko; Duller, Geoffrey Alastair Thomas; Wintle, Ann G. (2008-08)

The temperature dependence, dose response and bleaching characteristics of the thermally transferred optically stimulated luminescence (TT-OSL) of sedimentary quartz were studied, in order to assess the potential of the ...
Characterization of 'Balkan flint' artefacts from Bulgaria and the Iron Gates using LA-ICP-MS and EPMA.

Bonsall, C.; Gurova, M.; Hayward, C.; Nachev, Ch; Pearce, N. J. G. (2010-01-01)
Chemically fingerprinting volcanic ash from Toba using biotite compositions

Smith, V. C.; Pearce, N. J. G.; Matthews, N. E.; Durant, A. J.; Petraglia, M.; Haslam, M.; Lane, C. S. (2011-12-01)
Chronology and controls of avulsion along a mixed bedrock-alluvial river

Tooth, Stephen; Rodnight, Helena; Duller, Geoff A. T.; McCarthy, Terence S.; Marren, Philip M.; Brandt, Dion (2007)

Avulsions are most characteristic of aggrading fluvial systems, but along the Klip River, subhumid eastern South Africa, abandonment and re-establishment of meander belts occurs under conditions of negligible vertical ...
A chronology of hurricane landfalls at Little Sippewissett Marsh, Massachusetts, USA, using optical dating

Madsen, A. T.; Duller, Geoff A. T.; Donnelly, J. P.; Roberts, Helen M.; Wintle, Ann G. (2009-08)

Optical dating has been applied to sediments preserved in Little Sippewissett Marsh, Massachusetts, USA, which are associated with overwashing of the beach barrier during hurricane strikes on the coast. The aims were to ...
Classification of Australian forest communities using aerial photography, CASI and HyMap data

Lucas, Richard M.; Bunting, Peter J.; Paterson, Michelle; Chisholm, Laurie (2008-05-15)

Within Australia, the discrimination and mapping of forest communities has traditionally been undertaken at the stand scale using stereo aerial photography. Focusing on mixed species forests in central south-east Queensland, ...
Climate variability over the last two millennia in the North American monsoon region, recorded in laminated lake sediments from Laguna de Juanacatlan, Mexico

Metcalfe, S. E.; Jones, Matthew D; Davies, S. J.; Noren, A.; Mackenzie, A. B. (2010-12)

High-resolution titanium (Ti) data obtained using an ITRAX XRF core scanner from a laminated sediment core from the Laguna de Juanacatlan, western central Mexico yield a unique high-resolution record of runoff (precipitation) ...
Climatic and non-climatic effects on the delta O-18 and delta C-13 compositions of Lake Awassa, Ethiopia, during the last 6.5 ka

Lamb, Henry F.; Telford, R. J.; Leng, Melanie J.; Mohammed, M. U.; Lamb, Angela L. (2011-09-12)

A comparison of a 6450 C-14 yr PO and delta(13)C record of authigenic calcite from Lake Awassa, Ethiopia, with other proxy climate records in the area suggests that the lake records long-term regional climate changes. ...
Climatic change in northern Ethiopia during the past 17,000 years: a diatom and stable isotope record from Lake Ashenge

Marshall, Michael H.; Lamb, Henry F.; Davies, Sarah J.; Leng, Melanie J.; Kubsa, Zelalem; Umer, Mohammed; Bryant, Charlotte (2009-08-01)

Lake Ashenge, a closed-basin lake near the northernmost penetration of summer monsoon rains, is well placed to provide a continental record of past changes in the strength of the African monsoon system. Diatom and oxygen ...
Climatic change recorded in the sediments of the Chew Bahir basin, southern Ethiopia, during the last 45,000 years

Foerster, Verena; Juninger, Annett; Langkamp, Oliver; Gebru, Tsige; Asrat, Asfawossen; Umer, Mohammed; Lamb, Henry F.; Wennrich, Volker; Rethemeyer, Janet; Nowaczyk, Norbert; Trauth, Martin H.; Schaebitz, Frank (2012-10)

East African paleoenvironments are highly variable, marked by extreme fluctuations in moisture availability, which has far-reaching implications for the origin, evolution and dispersal of Homo sapiens in and beyond the ...
Combining ground penetrating radar surveys and optical dating to determine dune migration in Namibia

Bristow, CS; Lancaster, N; Duller, GAT (2005-03)

Ground penetrating radar (GPR) profiles across a complex linear dune in the Namib Sand Sea have been used to image sets of cross-stratification and their bounding surfaces. A combination of radar facies analysis and radar ...
Combining textural and hyperspectral information for the classification of tree species in Australian savanna woodlands

Bunting, Peter J.; He, Wenda; Zwiggelaar, Reyer; Lucas, Richard M. (2009-11-01)

This paper outlines research undertaken to assess the ability of textural information, from image filters, to be used alongside hyperspectral data for the classification of broad forest types. The study made use of 2.6 m ...
Comment on "A synchronized dating of three Greenland ice cores throughout the Holocene" by B M Vinther et al : No Minoan tephra in the 1642 B.C. Layer of the GRIP ice core

Pearce, N. J.; Denton, J. S. (2008-02-23)
Comment on “A synchronized dating of three Greenland ice cores throughout the Holocene” by B. M. Vinther et al.: No Minoan tephra in the 1642 B.C. layer of the GRIP ice core

Pearce, Nicholas J. G.; Denton, Joanna S. (2008-02-23)

There has been much debate in recent years among archaeologists and Earth scientists about the date of the Minoan eruption of Santorini (Thera). This debate has centered upon archaeological finds, radiocarbon dating and ...
Comment on "Some numerical considerations in the geochemical analysis of distal microtephra" by A.M. Pollard, S.P.E. Blockley and C.S. Lane

Bendall, C. A.; Pearce, N. J.; Westgate, J. A. (2008-05-01)
Comment on “Some numerical considerations in the geochemical analysis of distal microtephra” by A.M. Pollard, S.P.E. Blockley and C.S. Lane

Westgate, John A.; Pearce, Nicholas J. G.; Bendall, Charles A. (2008-05)
A Complete Terrestrial Radiocarbon Record for 11.2 to 52.8 kyr B.P.

Ramsey, Christopher Bronk; Staff, Richard A.; Bryant, Charlotte L.; Brock, Fiona; Kitagawa, Hiroyuki; van der Plicht, Johannes; Schlolaut, Gorden; Marshall, Michael H.; Brauer, Achim; Lamb, Henry; Payne, Rebecca L.; Tarasov, Pavel E.; Haraguchi, Tsuyoshi; Gotanda, Katsuya; Yonenobu, Hitoshi; Yokoyama, Yusuke; Tada, Ryuji; Nakagawa, Takeshi (2012-10-19)

Radiocarbon (14C) provides a way to date material that contains carbon with an age up to ~50,000 years and is also an important tracer of the global carbon cycle. However, the lack of a comprehensive record reflecting ...

Now showing items 21-40 of 201

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