نتایج جستجو برای: late holocene

تعداد نتایج: 201114  

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2005
K J Brown J S Clark E C Grimm J J Donovan P G Mueller B C S Hansen I Stefanova

High-resolution analyses of a late Holocene core from Kettle Lake in North Dakota reveal coeval fluctuations in loss-on-ignition carbonate content, percentage of grass pollen, and charcoal flux. These oscillations are indicative of climate-fuel-fire cycles that have prevailed on the Northern Great Plains (NGP) for most of the late Holocene. High charcoal flux occurred during past moist interval...

Journal: :PLoS ONE 2008
Paul C. Sereno Elena A. A. Garcea Hélène Jousse Christopher M. Stojanowski Jean-François Saliège Abdoulaye Maga Oumarou A. Ide Kelly J. Knudson Anna Maria Mercuri Thomas W. Stafford Thomas G. Kaye Carlo Giraudi Isabella Massamba N'siala Enzo Cocca Hannah M. Moots Didier B. Dutheil Jeffrey P. Stivers

BACKGROUND Approximately two hundred human burials were discovered on the edge of a paleolake in Niger that provide a uniquely preserved record of human occupation in the Sahara during the Holocene ( approximately 8000 B.C.E. to the present). Called Gobero, this suite of closely spaced sites chronicles the rapid pace of biosocial change in the southern Sahara in response to severe climatic fluc...

2005
Janelle Stevenson

A late-Holocene vegetation record is presented from the southwest coast of New Caledonia. Lac Saint Louis is a freshwater swamp at 3m a.s.l. adjacent to the River Coulee delta. Pollen analysis, charcoal analysis, radiocarbon dating and stratigraphic analyses have been used to reconstruct the vegetation and sedimentary history of the swamp. The sediment record commences at 6000 BP and reflects r...

2015
Douglas W. Burbank DOUGLAS W. BURBANK

Lichenometric studies permit close dating for the timing of stabilization of the late Holocene moraines built by North Mowich, Carbon, Winthrop, Cowlitz, and Ohanapecosh glaciers on Mount Rainier. The moraine chronologies indicate synchronous responses among these glaciers during the past 200 yr. Periods of glacier recession began between 1768-1777, 1823-1830, 1857-1863, 1880-1885, 1902-1903, 1...

2003
Simone R. Alin Andrew S. Cohen

Assemblages of ostracodes from sediment cores illuminate lake-level history at decadal to centennial timescales during the late Holocene at Lake Tanganyika, East Africa. The ostracode-based lake-level curves for several cores resemble both each other and the only previously published lake-level record of comparable resolution for Lake Tanganyika during this interval, successfully reconstructing...

2004
JOHN W. WILLIAMS BRYAN N. SHUMAN THOMPSON WEBB PATRICK J. BARTLEIN PHILLIP L. LEDUC

This paper integrates recent efforts to map the distribution of biomes for the late Quaternary with the detailed evidence that plant species have responded individualistically to climate change at millennial timescales. Using a fossil-pollen data set of over 700 sites, we review late-Quaternary vegetation history in northern and eastern North America across levels of ecological organization fro...

2007
J. Tibby S. G. Haberle

A new diatom record from Lake Euramoo on the Atherton Tableland, north Queensland, Australia is used to assess regional climate change and variability and their links to forcing at a local to global scale. The major factor driving diatom composition in the approximately fifteen thousand-year record appears to be regional moisture availability. Patterns of diatom preservation and other indicator...

Journal: :PLoS Biology 2008
David Nogués-Bravo Jesús Rodríguez Joaquín Hortal Persaram Batra Miguel B Araújo

Woolly mammoths inhabited Eurasia and North America from late Middle Pleistocene (300 ky BP [300,000 years before present]), surviving through different climatic cycles until they vanished in the Holocene (3.6 ky BP). The debate about why the Late Quaternary extinctions occurred has centred upon environmental and human-induced effects, or a combination of both. However, testing these two hypoth...

2015
Robert S Thompson

Apparent changes in vegetation distribution, fire, and other disturbance regimes throughout western North America have prompted investigations of the relative importance of human activities and climate change as potential causal mechanisms. Assessing the effects of Euro-American settlement is difficult because climate changes occur on multi-decadal to centennial time scales and require longer t...

2013
Jadranka Mauch Lenardić

The fossil remains of lemmings (Dicrostonyx sp.) have been discovered for the first time in Croatia. The small sample of 11 teeth (M1-3 and M1) originate from the Late Pleistocene/?Holocene sediments from the Romualdova pećina site (Western Istria). The resemblance has been observed in morphological data, while some metrical parameters differ slightly in comparison to the findings from some oth...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید