Showing papers in "Quaternary Research in 1991"

TL;DR: The magnetic susceptibility of loess and paleosols in central China represents a proxy climate index closely related to past changes of precipitation and vegetation, and thus to summer monsoon intensity as discussed by the authors.

TL;DR: In this article, a data set illuminating 10- to 104-yr variability refines our understanding of oceanic versus geomagnetic or solar forcing of atmospheric 14C12C ratios.

TL;DR: In this paper, a linear, two-dimensional, seasonal energy balance climate model has been proposed to model the seasonal temperature response to orbital forcing on land, which has been shown to have a sensitivity comparable to general circulation models.

TL;DR: In this article, stratigraphic and geomorphic evidence indicates that an abnormally low water table 10,900 yr B.P. was followed by a water-table rise accompanied by the deposition of an algal mat (the black mat) that buried mammoth tracks, Clovis artifacts, and a well.

TL;DR: In this paper, the accumulation rates of biogenic and lithogenic components were studied in 39 turbidite-free, well-dated sediment cores from the northern Indian Ocean to define the proportions of fluvial and eolian input and to reconstruct Quaternary patterns of coastal upwelling.

TL;DR: According to the character of lake development during the last 18,000 years, three regions and six subregions have been distinguished as mentioned in this paper, and most lakes reached their highest levels between 9500 and 3500 yr B.P.

TL;DR: The 13C/12C ratios of occluded carbon within opal phytoliths from the northern Great Plains show potential as a basis for paleoclimatic reconstruction as discussed by the authors.

TL;DR: In this article, the length of the late-glacial chronozones has been calculated on the basis of these replicate varve counts and a comparison with their estimated duration in radiocarbon years has been made.

TL;DR: In this paper, age determinations of alluvial sediments in the tropics are evaluated by comparison with U/Th ages of pedogenic accumulations in the alluvium of the lower Gilbert River, a large fan delta in the wet-dry tropics of northern Queensland, Australia.

TL;DR: In this paper, radiocarbon dates from lake sediment sequences cluster between 30,000 and 21,000 yr B.P., indicating a Pleistocene wet phase. But, the study area is crossed by the 20-mm isohyet; between 9300 and about 4 m thick, a longterm rise of the groudwater table is inferred.

TL;DR: In this article, an analysis of the shell carbonate of 76 radiocarbon-dated Holocene samples of the land snail Trochoidea seetzeni from the northern Negev Desert in southern Israel were carried out and the results were compared to modern snails from the same region.

TL;DR: Li et al. as mentioned in this paper provided the first independent age estimates on a susceptibility record from the Loess Plateau of China using thermoluminescence (TL) dating simultaneously with magnetic susceptibility measurements.

TL;DR: In the Voidomatis basin, Epirus, northwest Greece, detailed morpho-and lithostratigraphic investigations, allied with radiometric dating, have identified four Quaternary terraced alluvial fills that range from middle Pleistocene to historic in age as mentioned in this paper.

TL;DR: More than 40 14C dates for raised beaches at Terra Nova Bay ranging from the present to 7505 ± 230 yr B.P. were obtained in two soil profiles as mentioned in this paper.

TL;DR: In this paper, the authors used multiple regression analysis of terrestrial molluscs in the loess sections of Achenheim (Alsace, France) for the reconstruction of climatic variations during the last three glacial-interglacial cycles back to 339,000 yr B.P.

TL;DR: The late Pleistocene deposits of Equus Cave, northern Cape Province, South Africa, have provided more than 30,000 taxonomically identifiable mammal bones from 48 species as discussed by the authors.

TL;DR: In this article, four soil chronosequences in the southern Great Basin were examined in order to study and quantify soil development during the Quaternary, and ages of the soils were approximated from several radiometric and experimental techniques, and rates were assessed using a conservative mathematical approach.

TL;DR: A 1m-deep gully section 460 m beyond the maximum Little Ice Age marginal moraines of Blaisen, Hardangerjokulen, central southern Norway, revealed alternations of minerogenic and organic sediments.

TL;DR: In the Galapagos archipelago of Ecuador, a Holocene fossil record approaching 500,000 bones, more than 90% of which predate the arrival of people, showed that most or all cases of extinction or extirpation occurred after first human contact in AD 1535.

TL;DR: Relative-dating studies applied to high-altitude moraines in the Rongbuk valley on the northern flank of Mt. Everest reveal strong contrasts in the weathering characteristics of the boulders exposed along moraine crests as discussed by the authors.

TL;DR: In this article, a preliminary regional tephrochronology was proposed for investigating the Holocene climatic history of Antarctica, with direct 14C dating, age/depth curves, and cross-correlations.

TL;DR: Pollen grains and spores, plant macrofossils, and sponge spicules from a 7.2m sediment core from Jackson Pond dating back to 20,000 yr B.P. are the basis for new interpretations of vegetational, limnological, and climatic changes in central Kentucky as discussed by the authors.

TL;DR: For example, the authors found that the Cape dune molerats (Bathyergus suillus) tend to be significantly larger in areas of higher rainfall, and they also tend to appear larger in late Quaternary fossil samples associated with independent evidence for relatively moist climate and small in sample associated with relatively dry conditions.

TL;DR: In this article, Packrat middens from the McCullough Range in the southeastern Mojave Desert of Nevada were used to test for middle Holocene aridity; the period between 6800 and 5060 yr B.P does appear to have been more arid than during the late Holocene period of record.

TL;DR: Holocene marine terraces along 15 km of the northeastern coast of North Island record episodic tectonic uplift as discussed by the authors, and the maximum late Holocene uplift rate in the study area is 8 mm/yr.

TL;DR: The characteristics of a new type of rock varnish from the hyperarid coastal deserts of northern Peru, combined with laboratory experiments on associated soil materials, provide new insights into the formation of the rock varns as mentioned in this paper.

TL;DR: The oldest terrace (>290,000-300,000 yr B.P) is found at +10 to +15 m on Zabargad and Northern Brother as discussed by the authors, and a 200,000+year high-sea stand is recorded by a terrace relict at +17 m on peridotite bedrock.

TL;DR: Pollen studies of marine sediments from Atlantic deep-sea core V22-196 (13°50′ N-18°57′ W; 3728m water depth) are used to reconstruct paleoclimates of north tropical west Africa since 140,000 yr B.P. as mentioned in this paper.

TL;DR: Pollen analysis of a 15.5m sediment core from Lake Naivasha, central Rift Valley of Kenya, reveals that the vegetation from before 20,290 to nearly 12,000 yr B.P. was dominated by open grassland, indicating arid conditions.