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Showing 1 to 20 of 41 for “"Paleosols"”.
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Paleosols as Holocene proxy climate indicators, McLean County, North Dakota
… environments of each soil horizon. </p> <p> The paleosols were developed in a sequence of deposits in a mile-long tributary to the Missouri River. The soils are in a shallow valley fill exposed by wave action along the north shore of Lake Sakakawea. The 1996 exposure was up to 4m high and 51.5m …
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Detailed paleoclimatic records from late Pennsylvanian polygenetic paleosols : north-central Texas, USA.
… and wet chemical soil properties indicate these paleosols were finely textured, fertile, and void of salinity problems. Paleoatmospheric pCO₂ estimates from the δ¹³C values of pedogenic calcite nodules indicate values near pre-industrial levels (360ppmV), which are in agreement with previously …
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Early hominid habitat preferences in East Africa: Stable isotopic evidence from paleosols
In order to generate information on the site-specific context of hominid foraging behavior, and understand early hominid land-use patterns and habitat preference, the synchronic variation of hominid activity preserved in archaeological sites is examined in a diversity of floral microhabitats across …
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Investigation of a paleocatena across a Late Pennsylvanian landscape comprised of organic and mineral paleosols
… comprise a paleocatena of organic and mineral paleosols formed on a coeval landscape. Northern sites were poorly drained leading to weakly developed Inceptisol profiles in the seatearth followed by thick accumulations of organic matter. More highly evolved profiles developed at the better …
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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.
… meandering deposits. The distribution of paleosols throughout the section is also cyclic. Immature, well-drained paleosols are associated with the braided deposits, whereas mature, poorly-drained paleosols are interbedded with the meandering deposits. Two large-scale aggradational fluvial …
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Local variability in early Oligocene paleosols as a result of ancient soil catenary processes, Brule Formation, Toadstool Park, Nebraska
… reconstructions because the features of paleosols are affected by changes in climate, ecology, topography, and lithology over time. These changes cause small-scale variations in the morphology and apparent development of paleosols and influence the degree to which certain soil features …
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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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Stable isotope paleohydrology of pedogenic carbonates in the Wayan Formation (Albian) from the wedge-top depozone in the North American Cretaceous Western Interior Basin
… isotopic paleohydrologic data on mid-Cretaceous paleosols spanning from paleoequatorial sites in Colombia to paleoarctic latitudes in Alaska have been used to constrain the oxygen isotope mass balance of the Albian hydrologic cycle. At mid-latitudes (40-50°N paleolatitude), sideritic paleosols …
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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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Late Mississippian (Chesterian) high-frequency climate change in the Pennington Formation at Pound Gap, KY USA.
… controlled-cyclicity. Pennington Formation paleosols provide a record of climate and ecological changes for latest Chesterian time. Forty paleosols were identified, described, and assigned to seven pedotypes ranging from Vertisols to Oxisols. Field and micromorphological evidence suggests a …
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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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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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PALEOCLIMATE DURING DEPOSITION OF THE GREATER TWILIGHT PARK CONGLOMERATE, UPPER DEVONIAN, SOUTHEAST NEW YORK
… the Greater Twilight Park Conglomerate (GTPC). Paleosols between layers of the GTPC are important archives of past climate. At four locations, floodplain facies exhibiting pedogenesis were selected for analysis due to their proximity to layers of the GTPC. Field observations of paleosols show …
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Multi-proxy palaeoclimate reconstruction of the permian-triassic mass extinction event
… to conglomeratic alluvial fans. Most of the paleosols include pedogenic carbonates at different stages of development, both above and below the P/Tr boundary. By the Triassic there is evidence of depressed water tables and increased seasonality. Analyses of the S13Qarba nd S18Ocarbsi gnatures …
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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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Fluvial sequence stratigraphy and paleoclimate of the Upper Triassic (Norian-Rhaetian) Chinle Strata, northern New Mexico.
… a broad area. Each location contains abundant paleosols of varying maturity with relatively consistent features throughout the strata. A typical paleosol profile has features similar to modern Aridisols, is about 1 meter thick, and has an AB–Bw–Bk–BC horizon succession. Depth-to-carbonate …
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Milankovitch-driven cyclicity and climate controlled dolomitization of a Late Triassic carbonate platform, Hungary
… or dolomitic caps, and reddish or greenish paleosols or reworked paleosols. The Triassic was a time of global greenhouse conditions and Milankovitch climate forcing has been well documented from lakes and off-shelf facies. The Triassic Hungarian carbonate platform records an imperfect …
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THE ICHNOLOGICAL AND DEPOSITIONAL CONTEXT OF BIOERODED TRICERATOPS BONES FROM THE MAASTRICTHIAN FRENCHMAN FORMATION OF SOUTHERN SASKATCHEWAN, CANADA
… and siltstone deposits, representing floodplain paleosols. Soils are the ideal habitat for terrestrial invertebrate scavengers that serve as the decomposers of decaying animal matter during the early dry stages of decay. The large ichnodiversity of osteic bioerosion trace fossils preserved in …
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