Showing papers in "Quaternary Research in 2003"

TL;DR: In this paper, a diffusion model of surface degradation explains the age range and shows that a randomly sampled small set of boulders (n = 3 − 7) will always yield a lower age limit for the moraine.

TL;DR: In this article, the decadal to centennial-resolution Holocene lake-level curve of the Dead Sea was presented and the regional hydrological and EM climatology that affected level variations were determined.

TL;DR: In this paper, a record of continental pluvial periods over the last 330,000 yr was provided by speleothems from Hoti Cave in northern Oman, where the authors measured the δD values of water extracted from speleothem fluid inclusions (δDFI) and calculated δ18O values of calcite calcite.

TL;DR: In this paper, the receiver operating characteristic (ROC) curve was used to identify analogs from distance metrics, and the probability of an analog vs no-analog result (a likelihood ratio) was computed for a postglacial pollen record at Tannersville Bog (Pennsylvania, USA).

TL;DR: In this article, a comparison of the present-day rain and cave water isotopic compositions and amounts at the Ma'ale Efrayim Cave site with those on the western flank shows that evaporation and higher temperatures on the eastern flank are major influences on isotopic composition.

TL;DR: In this article, the ages of Quaternary pedogenic carbonate clast-rinds from gravels of glacio-fluvial terraces in the Wind River Basin have been obtained with 230Th/U dating by thermal ionization mass spectrometry applied to carefully selected milligram-size samples.

TL;DR: Palynological and sedimentological data from Lake Telmen, in north-central Mongolia, permit qualitative reconstruction of relative changes in moisture balance throughout the mid- to late Holocene as discussed by the authors.

TL;DR: The response of Central European vegetation to rapid climate change during the late Quaternary period (Eemian to Holocene) is assessed by data from the new pollen record of Furamoos, southwestern Germany.

TL;DR: A new diatom record from Lake Victoria's Pilkington bay, subsampled at 21- to 25-year intervals and supported by 20 AMS dates, reveals a ∼10,000 calendar year environmental history that is supported by published diatom and pollen data from two nearby sites.

TL;DR: In this article, high-resolution AMS 14C chronologies from the mid-latitudes of South America were used to pinpoint a cool episode between 11,400 and 10,20014C yr B.P.

TL;DR: In this article, the most extreme parts of the highly variable last glacial period, with the maximum extension of dry steppe on land and the occurrence of cool and dilute waters at the core site, were used to document the short-term environmental changes that occurred in southwest Europe since 25,000 yr B.P.

TL;DR: In this paper, the authors developed a warm-season (July-September) temperature reconstruction that spans A.D. 1593-1992 based on the first eigenvector from principal component analysis of six maximum latewood density (MXD) chronologies.

TL;DR: A high-resolution chronology for Peoria Loess from three sites in Nebraska, midcontinental North America, is determined by applying optically stimulated luminescence (OSL) dating to 35-50 μm quartz as mentioned in this paper.

TL;DR: A phytolith record from Monte Oscuro, a crater lake located 10 m above sea level on the Pacific coastal plain of Panama, shows that during the Late Pleistocene the lake bed was dry and savanna-like vegetation expanded at the expense of tropical deciduous forest, the modern potential vegetation.

TL;DR: In this article, an analysis of two infilled lakes in Blekinge, southeast Sweden, indicates the presence of at least three tephra horizons of Termination 1 and early Holocene age.

TL;DR: Sediment cores with new radiocarbon dates from the southern outlet of glacial Lake Agassiz indicate that meltwater delivery to the Mississippi valley was disrupted at 10,800 14C yr B.P. as mentioned in this paper.

TL;DR: In this paper, European vegetation during representative “warm” and “cold” intervals of stage-3 was inferred from pollen analytical data, and the inferred vegetation differs in character and spatial pattern from that of both fully glacial and fully interglacial conditions and exhibits contrasts between warm and cold intervals.

TL;DR: In this article, Tsunami deposits from as many as 50 large tsunamis during the last 7000 years are preserved on the Pacific coast of the Kamchatka Peninsula near the mouth of the Zhupanova River, southern Kronotskiy Bay.

TL;DR: Pollen analysis of a sediment core from Zagoskin Lake on St. Michael Island, northeast Bering Sea, provides a history of vegetation and climate for the central Bering land bridge and adjacent western Alaska for the past ≥30,000 14C yr B.P as mentioned in this paper.

TL;DR: In this paper, the authors examined the stratigraphy, sources, and paleoclimatic significance of Holocene Bignell Loess in the central Great Plains and found that a broadly similar sequence of loess depositional units and paleosols was observed in thick bignell loess sections up to 300 km apart, suggesting that these sections record major regional changes in the balance between dust deposition and pedogenesis.

TL;DR: The interactions between climatic and volcanic forcing on diatom communities contained in a 50,000-year sedimentary sequence from Lake Massoko, Tanzania, were examined in this paper.

TL;DR: In this paper, a stalagmite was analyzed using gas chromatography-mass spectrometry (GC-MS) to identify n-alkanes in the stalagmites and showed that the higher plants and microorganisms in the overlying soils contribute a proportion of nalkanes.

TL;DR: The environmental history of the Northern Rocky Mountains was reconstructed using lake sediments from Burnt Knob Lake, Idaho, and comparing the results with those from other previously published sites in the region to understand how vegetation and fire regimes responded to large-scale climate changes during the Holocene.

TL;DR: This article showed that an abrupt sedimentary transition from a mid-Holocene sapropel to calcareous laminated muds occurred at about 3200 cal yr B.P. and suggested that the change may signal a step toward increased aridity and intensified surface winds that affected western equatorial Africa from Ghana to the Congo basin.

TL;DR: In this paper, the authors present the first application of cross-dating (Th/U measured by TIMS and 14C measured by accelerator mass spectrometry (AMS) of calcite covering prehistoric paintings.

TL;DR: In this article, the Pekulney Mountains and adjacent Tanyurer River valley are key regions for examining the nature of glaciation across much of northeast Russia and the results of morphometric analyses and terrace stratigraphy constrain the timing of glaciations in this region of central Chukotka.

TL;DR: Gravel channels were formed by a river that originated as overflow from the Sevier basin along the Old River Bed during the late regressive phases of Lake Bonneville (after 12,500 and prior to 11,000 14C yr B.P.) as mentioned in this paper.

TL;DR: A day when molecular analyses are used routinely to supplement morphological identifications and possibly to provide a time-lapse view of molecular diversification is envisioned.

TL;DR: A new packrat midden chronology from Playas Valley, southwestern New Mexico, is the first installment of an ongoing effort to reconstruct paleovegetation and paleoclimate in the U.S.A. Borderlands as discussed by the authors.