نتایج جستجو برای: palaeosols

تعداد نتایج: 55  

Journal: :Eiszeitalter und Gegenwart 2023

Abstract. Loess–palaeosol sequences (LPSs) remain poorly investigated in the southern part of Upper Rhine Graben but represent an important element to understand environmental context controlling sediment dynamics area. A multi-method approach applied LPS at Köndringen reveals that its formation occurred during several glacial–interglacial cycles. Field observations, as well colour, grain size,...

2017
CHRISTOPHER J. LEPRE

The Okote Member from the northeast Turkana Basin of Kenya represents an exceptionally good archive of Early Pleistocene archaeological and fossil sites. Field study of the lower Okote Member and underlying deposits was conducted in detail at two sets of outcrops (500 to 1000 m long) separated by some 22 km of modern landscape. The examined sections (10 to 15 m thick) preserve two facies: inter...

2014
NATHAN D. SHELDON RAMANANDA CHAKRABARTI ROGER M. H. SMITH Adrian Immenhauser

The end of the Palaeozoic is marked by two mass-extinction events during the Middle Permian (Capitanian) and the Late Permian (Changhsingian). Given similarities between the two events in geochemical signatures, such as large magnitude negative dC anomalies, sedimentological signatures such as claystone breccias, and the approximate contemporaneous emplacement of large igneous provinces, many a...

Journal: :Palaeobiodiversity and Palaeoenvironments 2022

Abstract One of the most important fossil fauna localities in Baikal region is Tagay section. It located on shore bay at northwestern coast Olkhon Island Lake and consists two different exposures, Tagay-1 Tagay-2. The section exposes predominantly lake sediments Miocene age contains a faunal complex. Tagay-2 composed slope wash subaerial Early Pleistocene (Calabrian?) with remains small mammals...

Journal: :Archaeological Prospection 2021

We show an extensive multimethod geophysical study of focusing on some enigmatic subsurface structures found at Ancient Aigeira (N Peloponnes, Greece) that could be interpreted either as prehistoric chamber tombs or complex weathering patterns the local marl–conglomerate rock sequences. It turns out nonseismic methods do not allow to distinguish between archaeological and a geological origin ob...

Journal: :European Journal of Soil Science 2022

In high-mountain areas, Pleistocene glaciations and erosion-related processes erased most of the pre-existing landforms soils. However, on scattered stable surfaces, ancient soils can be locally preserved for long periods, retaining valuable palaeoenvironmental information. Such relict surfaces survived during either through coverage by non-erosive, cold-based, ice or as nunataks. Thus, such re...

Journal: :Journal of African Earth Sciences 2021

A sedimentological investigation of Miocene deposits at the periphery Zagros foreland basin , Kurdistan Region, NE Iraq, reveals a cyclical arrangement carbonate-evaporite ramp facies . The study aims to provide rare insight into lateral variability microfacies and environments such systems' inner shoreline Between 10 40 depositional cycles are preserved, separated by flooding surface, recordin...

Journal: :Quaternary Science Reviews 2021

The Koora Basin (south Kenya Rift) preserves a continental, tropical, one-million-year record of environmental change driven by global climate, regional tectonism and volcanism. Diatom-based reconstructions from Olorgesailie Drilling Project (ODP) cores indicate lakes that expanded contracted with conductivities ranging between ∼200 > 25,000 μS.cm−1 pH 7.9–11.2. Benthic planktonic diatoms docum...

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