نتایج جستجو برای: late holocene
تعداد نتایج: 201114 فیلتر نتایج به سال:
Lago Trasimeno (central Italy), 10 km wide and < 6m deep, fills a basin of tectonic origin, is one Europe's few endorheic lakes. We report on multidisciplinary stratigraphic study based seismic reflection profiles two sediment cores, aimed at providing information the vegetational, lithological, climate history this area. Trace elements, palynology, macrofossils, organic carbon, C isotopes, cou...
This paper present a high resolution record of paleostorm events in the French Mediterrannean coast over the past 7000 years based on a long sediment core from lagoonal environment in Gulf of Lions. Using a multi-proxies approach on core associating grain size, faunal analysis, with a chronology derived from radiocarbon dates, we reconstruct Mid to Late Holocene history of backbarrier deposits ...
We present fossil pollen data and discuss their climatic interpretations from a 688-cm-long sediment core from Hurleg Lake, a freshwater lake located in the Qaidam Basin on the NE Tibetan Plateau, just beyond the northern limit of the East Asian summer monsoon influence. The reconstruction of the Holocene vegetation and climate history was aided by modern surface pollen analysis. The 14000-yr c...
Lakes are very interesting sedimentary environments for the study of ancient climate, changes in sedimentary environments and lake level changes. Lake Zeribar is situated in the Zagros Mountains, Kurdistan, Iran. The main purpose of this research is to examine grain size sediments, geochronology and clay mineralogy accumulated in Zeribar Lake in order to check the water level fluctuations, clim...
Mirak is one of the open-air Paleolithic sites in the Iranian Central Plateau and the only Iranian archaeological open-air site which has been excavated extensively. The site is comprised of 8 mounds, located in a dry floodplain some kilometers south of Semnan in the northern fringes of the Iranian Central Desert, aka. Dash-I Kavir. Mirak mound no. 8 was selected for the excavation. The mound i...
The ability to respond to natural selection under novel conditions is critical for the establishment and persistence of introduced alien species and their ability to become invasive. Here we correlated neutral and quantitative genetic diversity of the weed Pennisetum setaceum Forsk. Chiov. (Poaceae) with differing global (North American and African) patterns of invasiveness and compared this di...
According to the refugee species concept, increasing replacement of open steppe by forest cover after the last glacial period and human pressure had together forced European bison (Bison bonasus)--the largest extant terrestrial mammal of Europe--into forests as a refuge habitat. The consequent decreased fitness and population density led to the gradual extinction of the species. Understanding t...
We have carried out detailed rock magnetic and paleomagnetic studies on a suite of four deep-sea sediment cores from Indonesia and the Philippine Islands, which form a transect from 6.3°N to 10.6°S. The cores have average sediment accumulation rates of 35-65 cm/kyr that all yield high-resolution paleomagnetic secular variation (PSV) records. The PSV records contain 44 correlatable inclination a...
Multiproxy analyses (including benthic and planktonic foraminifera, δO and δC records, grain-size distribution, ice-rafted debris, XRF geochemistry and magnetic susceptibility) were performed on a C-dated marine sediment core from Storfjordrenna, located off of southern Svalbard. The sediments in the core cover the termination of Bølling–Allerød, the Younger Dryas and the Holocene and reflect g...
Fossil spores of the dung fungus Sporormiella spp. in sediment cores from throughout Madagascar provide new information concerning megafaunal extinction and the introduction of livestock. Sporormiella percentages are very high in prehuman southwest Madagascar, but at the site with best stratigraphic resolution the spore declines sharply by approximately 1,720 yr B.P. (radiocarbon years ago). Wi...
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