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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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cross-laminations (1)
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cross-stratification (2)
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imbrication (1)
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ripple drift-cross laminations (1)
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secondary structures
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concretions (1)
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stylolites (1)
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soft sediment deformation
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olistostromes (1)
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sediments
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sediments
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carbonate sediments (1)
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clastic sediments
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clay (1)
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gravel (1)
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sand (1)
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silt (1)
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marine sediments (1)
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turbidite (1)
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soils
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paleosols (2)
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soils
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Cambisols (1)
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Gleys (1)
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Luvisols (1)
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Valdarno Basin
The Plio-Pleistocene fluvio-lacustrine Upper Valdarno Basin (central Italy): stratigraphy and Basin fill evolution
Tectonic and sedimentary evolution of the Upper Valdarno Basin: new insights from the lacustrine S. Barbara Basin
Abstract The overwhelming documentation of coarse-grained alluvial fans dominated by mass flow contrasts with the scarce accounts of finer grained, traction-dominated alluvial fans. To fill this gap, we present sedimentological and architectural data from a set of sand-rich, streamflow-dominated Pleistocene fans flanking the eastern Upper Valdarno Basin, Italy. The routing of sand-rich sediment resulted from the fast, intense weathering of the feldspar-rich, carbonate-deprived sandstone bedrock underlying the fan catchments. Although capable of entraining large boulders, high water discharge sustained tractional reworking along the proximal facies belts, hindering mass flow. The medial facies belts have a channelized, braided planform and are dominated by processes hardly distinguishable from those characterizing fluvial environments. Along the distal facies belts, extensive overbank tracts are composed of terminal splays and crevasse lobes, the spatial arrangement of which controlled the evolution of through-going tributary channels connected to the axial basin drainage. This study focused on the sedimentary processes, stratal architecture and morphodynamics of the alluvial fans and considered the effect of bedrock inheritance on their development. The results underline how granulometry and mass flow dominance are not distinctive of alluvial fan sedimentation per se and indicate how the critical detection of piedmont, radial palaeomorphology is crucial in the identification of ancient alluvial fans.
Friction- and Inertia-Dominated Effluents In A Lacustrine, River-Dominated Deltaic Succession (Pliocene Upper Valdarno Basin, Italy)
Going over 30 years of geological and paleontological studies on the Pliocene-Pleistocene Upper Valdarno Basin (Tuscany, Italy)
Depositional environments of the Plio-Pleistocene Upper Valdarno Basin (Tuscany, Italy)
Compression-to-extension record in the Late Pliocene-Pleistocene Upper Valdarno Basin (Northern Apennines, Italy): structural and thermochronological constraints
Just a few: rodents and lagomorphs in the Plio-Pleistocene fossil record of the Upper Valdarno Basin
The non-marine molluscs of the Plio-Pleistocene Upper Valdarno Basin (Tuscany, central Italy): depositional environments, palaeoecology and biochronology
Climate and vegetation in the Upper Valdarno Basin (central Italy) as a response to Northern Hemisphere insolation forcing and regional tectonics in the late Pliocene-early Pleistocene
Integrating sedimentological and palaeopedological data for palaeoenvironmental reconstruction: examples from the Plio-Pleistocene Upper Valdarno Basin (Northern Apennines, Italy)
Pleistocene lacustrine fan delta deposits of the Valdarno Basin, Italy
Coarse-Grained Low-Sinuosity River Deposits: Example from Plio-Pleistocene Valdarno Basin, Italy
Abstract The coarse-grained fluvial deposits of the Plio-Pleistocene Valdarno intermontane basin consist of massive or cross-stratified coarse gravel grading upward into cross-laminated sand overlain by massive overbank silt and clay with widespread pseudogley pedogenesis. The overall characteristics of such deposits (fining upward, abundance of overbank sediments, occurrence of extensive planar cross-stratification) would suggest deposition by a coarse-grained meandering river. A detailed analysis of the relation between the depositional surface and the fabric of pebbles in planar crossbeds indicates downstream rather than lateral accretion. In fact, the dip of the intermediate axis of the pebbles parallels the foreset dip. Such a feature and the basin-wide divergence between trough and planar cross-stratification suggests deposition by lateral-diagonal bars in a low-sinuosity river. The Pleistocene fluvial deposits of the Valdarno basin have a facies association and sedimentary structures similar to modern low-sinuosity rivers of the Northern Apennines.