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Lake Bonneville (4)
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Paleozoic
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Carboniferous
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Devonian
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Tensleep Sandstone (1)
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Primary terms
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absolute age (66)
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Africa
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neon
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radon
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North America
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Ocean Drilling Program
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Leg 154
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ODP Site 926 (1)
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oxygen
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Paleozoic
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Middle Pennsylvanian
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Devonian
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middle Paleozoic (1)
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Permian
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Tensleep Sandstone (1)
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upper Paleozoic
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palynomorphs
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Coniferales
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plate tectonics (20)
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Precambrian
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upper Precambrian
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South America
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springs (12)
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sulfur
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Georgia
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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
drainage basins
Cenozoic Intracontinental Reactivation of the Central Indian Tectonic Zone Available to Purchase
Timing and geometry of the Chemehuevi Formation reveal a late Pleistocene sediment pulse into the Lower Colorado River Open Access
Rb-Sr isochron method of sediment source fingerprinting reveals a fundamental shift in erosion in response to anthropogenic land use Available to Purchase
Mud retention in hydrologically closed basins promoted pre-vegetation meandering: evidence from the Neoproterozoic Diabaig Formation, Scotland Available to Purchase
Abstract Fluvial point-bar deposits are described from the c. 1 Ga Diabaig Formation, representing some of the most compelling architectural evidence of planform sinuosity recognized in pre-vegetation sedimentary strata to date. The stratigraphical architecture of the deposits indicates different planform transformations in response to meander-bend expansion and downstream migration. Point-bar architectural motifs are locally abundant in the unit and this is attributed to elevated amounts of mud-calibre cohesive sediment. Mud afforded landscape stability that, together with limited stream power, was sufficient to corral sediment into single-thread, sinuous channels. Significant volumes of fine-grained sediment were encouraged to accumulate by the local basin setting of several topographically confined endorheic depressions. These conditions ceased once the hydrologically closed valleys were filled, with the overlying sandstone-dominated Applecross Formation subsequently deposited by low-sinuosity, braided rivers that bypassed fine-grained sediment oceanward. Other endorheic basins conducive to the formation of depositional meanders should be expected to have been relatively widespread on pre-vegetation Earth, though many individually limited in size, confined by their inherited topographies. Depositional architectures representative of sinuous channel planforms remain scarce within more extensive, externally drained basins.