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Showing 1 to 20 of 39 for “"paleosol"”.
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Miocene paleoenvironments and paleosol pH proxies.
… with seasonally-variable discharge, alluvial paleosols with seasonal water deficit, and intermittent eolian deposits. Climate state was constrained using a combination of paleosol morphological properties, micromorphological associations, pedotransfer functions for climate variables, and …
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A Paleosol-Derived Environmental Perspective on MIS 3 in the Central Great Plains
… in central Kansas where it contains two cumulic paleosols and an intervening detrital unit, which have been radiocarbon dated ~46 ka to 24 ka, a period that spans most of MIS 3. Herein, newly obtained stable isotope, elemental, enviromagnetic, phytolith, particulate charcoal, particle size, …
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Climate and habitat reconstruction of hominid sites in northern China with paleosol stable isotopes
… from fossil faunal and floral assemblages, paleosols, and geochemistry are often contradictory. In order to understand paleoenvironments and the nature of hominid adaptations, evolution and behavioral change, more accurate reconstructions of their environments are needed. Stable isotope …
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Paleosol evolution in a sequence stratigraphic framework, Cretaceous Ferron Notom Delta, south central Utah, U.S.A.
Hydromorphic paleosols have been previously thought of as ever wet and poorly developed, and lacking useful paleoenviromental and paleoclimatic indicators. However, a suite of pedogenic features and geochemical attributes of hydromorphic floodplain paleosols of the youngest non-marine (100ka) …
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Stratigraphy, magnetic susceptibility, and mineralogy of loess-paleosol sequences in southwestern Illinois and eastern Missouri
Magnetic susceptibility (MS) zones, controlled by silt-size magnetite concentrations, have been delineated within oxidized, C horizon Peoria and Loveland Silts along the Illinois and Mississippi Valleys. Lower Peoria and lower Loveland Silts (MS = 55-80 $\times\ 10\sp{-5}$ SI) and Roxana Silt (MS = …
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PALEOPEDOLOGY AND PALEOGEOMORPHOLOGY OF THE EARLY OLIGOCENE ORELLA AND WHITNEY MEMBERS, BRULE FORMATION, WHITE RIVER GROUP, TOADSTOOL GEOLOGIC PARK, NEBRASKA
… style was driven by climate change, 20 paleosols from 8 profiles were analyzed from the fluvial-aeolian Orella Member through the aeolian-dominated Whitney Member of the earliest Oligocene Brule Formation at Toadstool Geologic Park, NE. Paleosol morphology and geochemistry were used to …
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Detailed paleoclimatic records from late Pennsylvanian polygenetic paleosols : north-central Texas, USA.
… Missourian) multistory, polygenetic paleosol intervals in north-central Texas, USA record complex paleoclimatic and paleohydrologic histories. Both paleosol intervals show evidence for initial development under well-drained conditions (illuviated clay, pedogenic calcite nodules, …
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Influence of climate and the expansion of C4 grasses on sequence-scale cyclicity and landscape development during the late Miocene to Pleistocene of West Texas.
… two drill cores reveals sequence-scale trends in paleosol maturity, cycle thickness, and facies proportions. Stable isotope geochemistry of bulk paleosol samples and pedogenic carbonate suggest C₄ expansion at 7.25 Ma and provide a pCO₂ reconstruction of the late Miocene to Pleistocene. C₄ onset …
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Reconstruction of the Late and Mid-Pleistocene climate and landscape history in SE-Central Europe - A paleopedological and geochemical multi-proxy approach in loess-paleosol studies.
Loess-paleosol sequences (LPSS) potentially are valuable archives for past environmental conditions. In SE-Central European lowlands thick loess plateaus can be found comprising several glacial-interglacial cycles. This work focuses on key sections in the middle and lower Danube Basin to i) …
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An Investigation of the Subsoil Component of a Constructed Mine Soil
… blend of B horizon, mixed paleoloesses, Sangamon paleosol and Illinoian till.
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Paleoenvironmental Variability across the Cretaceous-Tertiary Boundary in the Alberta Foreland Basin, as Interpreted from Fluvial Deposits and Paleosols, Red Deer River Valley, Alberta, Canada.
… indicates fluvial aggradation and variability of paleosol morphology in response to foreland orogenesis. The depositional history records an evolution from amalgamated, multi-story, braided sand bodies to accretionary, single-story, overbank-prone meandering deposits. The distribution of paleosols …
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Sedimentology of historic and prehistoric deposits in the drainage basin of Deep River and Muddy Creek on the Piedmont of North Carolina
… sediments in some areas of the floodplains. A paleosol, indicated by an Ab horizon, records the floodplain surface at the time of European contact. This paleosol, dated by Coastal Carolina Research of Tarboro, North Carolina, was used to differentiate historic and prehistoric deposits.;Although …
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The sedimentology and stratigraphy of Salt Creek Field, Kent County, Texas
… characterized by differential cementation and paleosol development. Depositional facies include fissile shale, crinoid-skeletal wackestone, crinoid and fusulinid-crinoid mud- and grain-dominated packstone, ooid-peloid grainstone, and a set of reefal facies dominated by phylloid algae forming …
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Assessing Pleistocene climate on the Southern High Plains through geochemical and physical characteristics of paleosols archived in the Blackwater Draw Formation
… deposits with loess tops forming individual paleosols. Loess-paleosol couplets represent periods of deposition followed by periods of landscape stability accompanied by pedogenesis. Here we utilize geochemical and physical properties of loess-paleosol couplets recorded in the Black Water Draw …
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Soil-Geomorphology and Soil-Stratigraphy in the Lower Pomme De Terre River Valley, Southwestern Missouri
… argillic horizons dominating T2, and a surface paleosol and alfisols dominating T3. Buried paleosols were identified in the sediments of T1 and T2.
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A Stratigraphic and Geochronologic Analysis of the Morrison Formation/Cedar Mountain Formation Boundary, Utah
… Formation is characterized by redoximorphic paleosol features, including iron concentrations, manganese-coated grains, and intense red-purple-green mottling. Upsection increases in chert-pebble lags and channelized conglomerates within the paleosol section indicate a period of reduced …
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Early hominid habitat preferences in East Africa: Stable isotopic evidence from paleosols
… the stable carbon isotopic composition of paleosol (buried soil) organic matter and pedogenic carbonate is used in this thesis to estimate the original proportion of tropical grasses (C$\sb4$ plants) to woody vegetation (C$\sb3$ plants) across the ancient land surfaces. Interpretation of …
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A stable isotope stratigraphy for the Axel Heiberg Fossil Forest and its application to Eocene climate
… samples of lignite (bulk fossil leaves), wood, paleosol, and resinite from the Middle to Late Eocene age fossil forest stratigraphy on Axel Heiberg Island, Nunavut, Canada. Bulk carbon isotopes show a record of frequent, large fluctuations on the scale of the Paleocene-Eocene Thermal Maximum …
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The use of geomorphological and pedological soil characteristics to assess planar borrowing at a Mandan Indian village, North Dakota
… to serve as a control. An underlying, contiguous paleosol (Early Holocene) is used as the stratigraphic reference in concert with physical, chemical and spatial soil characteristics to determine the degree of earth-moving activity (planar borrowing). Utilization of geomorphological and pedological …
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Late Pleistocene and Holocene geology of the Moe Site, New Town, North Dakota
… Holocene), which is the mollic horizon of a paleosol, the Pick City Member, which is light-colored, and was probably derived from unstable hillslopes during the warm, dry Middle Holocene Age, and the Riverdale Member (Late Holocene), which is slightly darker colored than the other members.
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