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Sedimentary structures, their character and physical basis

01 Jan 1984-
TL;DR: In this article, a model of transverse bedforms in Unidirectional Flows is presented, along with cross-stratification patterns of Ripples and Dunes in Changing Flows.
Abstract: 1. Environmental Fluid Dynamics. 2. Entrainment and Transport of Sedimentary Particles. 3. Particle Motions at Low Concentrations: Grading in Pyroclastic-Fall Deposits. 4. Packing of Sedimentary Particles. 5. Orientation of Particles During Sedimentation: Shape-Fabrics. 6. Transition to Turbulence and the Fine Structure of Steady Turbulent Boundary Layers: Parting Lineation and Related Structures. 7. Models of Transverse Bedforms in Unidirectional Flows. 8. Empirical Character of Ripples and Dunes Formed By Unidirectional Flows. 9. Climbing Ripples and Dunes and Their Cross-Stratification Patterns. 10. Bedforms in Supercritical and Related Flows: Transverse Ribs, Rhomboid Features, and Antidunes. 11. Transverse Bedforms in Multidirectional Flows: Wave-Related Ripples Marks, Sand Waves, and Equant Dunes. 12. Ripples and Dunes in Changing Flows.
Citations
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Journal ArticleDOI
TL;DR: A ground-penetrating radar (GPR) is a noninvasive geophysical technique that detects electrical discontinuities in the shallow subsurface as mentioned in this paper, which can be used to detect electrical faults.

963 citations

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TL;DR: In this article, the authors derived criteria for the recognition of contourite vs. turbidite deposits, based on the analysis of many seismic profiles from both published and unpublished sources.

605 citations

Journal ArticleDOI
TL;DR: In this article, it was shown that large, outsized clasts can be transported along a rheological interface which develops within the flow, and the clasts "glide" along the top of an underlying, pseudolaminar inertia-flow layer, partly submerged in it, and are driven by the downflow component of turbulent shear-stresses transmitted from the overlying, faster-moving turbulent layer.

523 citations

Journal ArticleDOI
TL;DR: In this article, the authors reveal a previously unsuspected large-scale pattern of streamlining within drift that is assumed to reflect former phases of ice flow, referred to as mega-scale glacial lineations, and a distinctive cross-cutting topology within the grain.
Abstract: Landsat images reveal a previously unsuspected large-scale pattern of streamlining within drift that is assumed to reflect former phases of ice flow. Such a glacial grain can be regarded as a landform assemblage comprised of a number of components. Drumlins and megaflutes form part of the pattern, but in addition there are two previously undocumented ice-moulded landform elements: streamlined lineations of much greater proportions, referred to as mega-scale glacial lineations, and a distinctive cross-cutting topology within the grain. The ice-moulded landform assemblage is described and illustrated with reference to examples from Canada. Possible modes of genesis of such landforms are discussed and their glaciological implications outlined. The discovery of this pattern indicates the pervasive nature of subglacial deformation of sediment, and demands a radical re-interpretation of ice sheet dynamics.

505 citations

Journal ArticleDOI
Ganapathy Shanmugam1
TL;DR: In this paper, a slope model is proposed that is a debris-flow dominated setting with both non-channelized and channelized systems, based on fluid rheology and flow state.

468 citations