نتایج جستجو برای: late holocene
تعداد نتایج: 201114 فیلتر نتایج به سال:
We report a 2000-year Antarctic ice-core record of stable carbon isotope measurements in atmospheric methane (delta13CH4). Large delta13CH4 variations indicate that the methane budget varied unexpectedly during the late preindustrial Holocene (circa 0 to 1700 A.D.). During the first thousand years (0 to 1000 A.D.), delta13CH4 was at least 2 per mil enriched compared to expected values, and duri...
Abstract This study purposed to reveal animal use in southern Kamchatka by examining the largest archaeofaunal collections recovered Tamara M. Dikova and Nikolai N. Dikov. Radiocarbon dates of charcoal caribou antler demonstrated that materials for this were dated during past 1,600 years, including three cultural periods: Nalychevo Culture (the 15–19th centuries AD), Tar’ya mid-first m...
A recent temperature reconstruction of global annual temperature shows Early Holocene warmth followed by a cooling trend through the Middle to Late Holocene [Marcott SA, et al., 2013, Science 339(6124):1198-1201]. This global cooling is puzzling because it is opposite from the expected and simulated global warming trend due to the retreating ice sheets and rising atmospheric greenhouse gases. O...
Isotopic and molecular analysis on human, fauna and pottery remains can provide valuable new insights into the diets and subsistence practices of prehistoric populations. These are crucial to elucidate the resilience of social-ecological systems to cultural and environmental change. Bulk collagen carbon and nitrogen isotopic analysis of 82 human individuals from mid to late Holocene Brazilian a...
Many lacustrine chronology records suffer from radiocarbon reservoir effects. A continuous, accurate varve chronology, in conjunction with accelerator mass spectrometry (AMS) 14C dating, was used to determine the age of lacustrine sediment and to quantify the past 14C reservoir effect in Sugan Lake (China). Reservoir age varied from 4340 to 2590 yr due to 14C-depleted water in the late Holocene...
We have previously described hominin remains with numerous archaic traits from two localities (Maludong and Longlin Cave) in Southwest China dating to the Pleistocene-Holocene transition. If correct, this finding has important implications for understanding the late phases of human evolution. Alternative interpretations have suggested these fossils instead fit within the normal range of variati...
In this paper we evaluate the role of human strategies in Andean Piedmont from northern Patagonia across Holocene. Specifically, present analysis Early Holocene-Late Holocene archaeological record Salamanca cave (Mendoza-Argentina). We identified technological changes that occurred during Late and implications a occupation hiatus Middle follow multiproxy approach by radiocarbon dates, archaeofa...
In a recent paper we reconstructed the calcification depth of G. truncatulinoides since the last deglaciation in the Florida Straits. We highlighted a significantly different calcification depth between 8-10 ka and the late Holocene. This migration was found in three different cores over the western North Atlantic American continental margin. This paper presents new Mg/Ca ratio data on G. trunc...
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