Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 20 for “"Middle Holocene"”.
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The role of biosphere-atmosphere-ocean interactions in the climate of West Africa during the Middle Holocene
… in the Earth's orbital forcing during the Middle Holocene (6K yrs BP) and the relative contribution of vegetation and ocean feedbacks. Simulations in which vegetation conditions were prescribed to the current distribution, show that an orbitally-induced increased seasonality in insolation …
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Evaluating the Antiquity and Morphology of Corner-notched Dart Points in the Eastern Great Basin
… the eastern Great Basin, they date to both the Middle and Late Holocene; and (2) in the central Great Basin, they date to only the Late Holocene. While it is possible that both age ranges are accurate, it is also possible that the "long" Elko chronology in the eastern region is a function of …
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The Role of Fire in Montane Forest Environments in the Willamette National Forest, Oregon
… free. Fire frequency increased during the early Holocene. Warmer and drier conditions are reflected in the herbaceous vegetation, <em>Artemisia</em>, Poaceae, and Cyperaceae, suggesting that meadows or other openings were part of the forest environment at this time. Fire frequency decreased at …
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Packrat middens: A tool for environmental reconstruction and human adaptation analysis
… middens were used to develop an early and middle Holocene paleoclimate sequence from the Mojave Desert. Identified species from both modern and ancient middens were tabulated by elevation range based on modern analogs to estimate the modern equivalent of the elevations of ancient middens. …
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Algal and protozoan response to Holocene climate change and anthropogenic impact: a case study from Sluice Pond, MA
… a diverse dinocyst record since the early Holocene. High dinocyst concentrations, including morphotypes not previously described, as well as the preservation of several specimens of cellulosic thecae are attributed to low dissolved oxygen (DO) in the basin. The fossil protozoan record …
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Paleoecological Analyses of the Late Holocene Dry Period in the Northwestern Great Basin, Nevada
… endorheic lakes that receded greatly during the Holocene. Several proxy records provide extensive evidence that the basin has gone through periods of amelioration from low precipitation followed by a return to dry conditions through the Holocene. Relative to the Pleistocene/Holocene transition …
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Prehistoric Colonization of Southcentral Alaska: Human Adaptations in a Post Glacial World
… The sites range from the Younger Dryas to middle Holocene in age and provide valuable contextual information for the human process of colonizing a region that was heavily glaciated during the LGM. The deglaciation and human colonization of southcentral Alaska is one of the most significant …
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Late Pleistocene and Holocene geology of the Moe Site, New Town, North Dakota
… of wind-blown silt that was deposited during the Holocene Epoch. It is divided into four members. These are, from bottom to top, the Mallard Island Member (Late Wisconsinan), which is light-colored and sandy, the Aggie Brown Member (Late Wisconsinan to Early Holocene), which is the mollic horizon …
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Paleoenvironmental reconstruction of late quaternary lacustrine sediments (Seibold Site) in southeastern North Dakota
… (units 3 and 4, latest Wisconsinan and earliest Holocene) an eutrophic lake was surrounded first by an open spruce and popular forest and then by tall grass prairie with scattered stands of trees. During this time the lake shallowed in response to the warmer climate that caused the change in …
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Hydroclimate variability in Central America during the Holocene inferred from lacustrine sediments in Lake Izabal, eastern Guatemala
"Holocene hydroclimate reconstructions have contributed to our understanding of the mechanisms controlling precipitation in Central America. Recent hydroclimate proxy records from the region, however, have revealed considerable spatiotemporal complexity in precipitation variability. This complexity …
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Post-Glacial Fire History of Horsetail Fen and Human-Environment Interactions in the Teanaway Area of the Eastern Cascades, Washington
… Fen during the post-glacial period. The early Holocene shows fire activity was low and steady and increased significantly during the middle Holocene. Fire activity remained relatively high during late Holocene. The archaeological record provides evidence that people were using these landscapes …
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A paleoenvironmental reconstruction of the Elands Bay area using carbon and nitrogen isotopes in tortoise bone
… Cave. The samples range in age from the late Holocene to the terminal Pleistocene. δ¹⁵N values are not strongly correlated with δ¹³C, indicating different drivers of variation in the two isotopes. δ¹³C and δ¹⁵N values are lower between 154-487 cal. BP, which spans the Little Ice Age, compared …
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Holocene Fire History Reconstruction of a Mid-Evaluation Mixed-Conifer Forest in the Eastern Cascades, Washington
… results show low fire activity in the early Holocene and the first half of the middle Holocene. After ca. 6000 calendar years before present (cal yr BP) fire activity was high until ca. 500 cal yr BP. Pollen analysis indicates a woodland environment existed at the site in the early Holocene, …
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Modeling nonlinear, nonstationary, vector time series : methods and applications.
… for describing the climates during the late and middle Holocene periods. Assessment of a utility scale photovoltaic (PV) power plant's potential performance is a critical aspect in the initial plant design and construction, and accurate monitoring of plant efficiency is crucial to profitable …
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The role of seals in coastal hunter-gatherer lifeways at Robberg, South Africa
… At Nelson Bay Cave (NBC), more than half of the Holocene mammal bones are from Cape Fur seals (Arctocephalus pusillus). Previous analyses of the seal assemblage from this site have studied only selected skeletal elements. This study is the first comprehensive analysis of seal remains from …
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A Multi-Method Approach to Re-associating Fragmented and Commingled Human Remains
… in the Cis-Baikal region during the Middle Holocene by salvaging information from Moty-Novaia Shamanka, a site that has not yet been studied and could potentially contribute to key questions surrounding the culture history of the region.
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Environmental change and human interaction in the western Mediterranean over the long term: a comparative study from Sardinia
Over the last 11,700 years of the Holocene, the Mediterranean climate has undergone long-term changes in rainfall and temperature patterns, punctuated by short-term excursions. These climatic shifts, combined with the expanding impact of agropastoral societies, have driven significant …
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Late glacial to Holocene climate and vegetation changes on the Tibetan Plateau inferred from fossil pollen records in lacustrine sediments
… synthesized previously published Late Glacial to Holocene climatic records from monsoonal central Asia in order to extract the general climate signals and the associated summer monsoon intensities. New climate and vegetation sequences were then established using improved quantitative methods, …
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The Ups and Downs of the Holocene: Exploring Relationships between Global CO2 and Climate Variability in the North Atlantic Region
… through rapid climate changes during the Holocene. Climate was reconstructed using high-resolution, radiocarbon dated, lake sediment geochemical proxies (magnetic susceptibility, loss-on-ignition, total carbon/nitrogen/sulphur determinations and biogenic silica), vegetational …
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Dendrochronological investigations of living and relict yew trees from eastern England
… conditions for pre-industrial and mid-Holocene periods. First, I apply dendrochronological methods to develop a tree-ring width (TRW) chronology spanning the past three centuries from a network of over 150 modern yew trees across eastern England. Analysis of climate-growth relationships …