Cross-bedding - Wikipedia
Cross-bedding can form in any environment in which a fluid flows over a bed with mobile material. It is most common in stream deposits (consisting of sand and gravel), tidal areas, and in aeolian dunes.
Previous research revealed that the cross-bedding related anisotropy in Jurassic aeolian Aztec Sandstone cropping out in the Valley of Fire State Park, Nevada, affects the orientation of compaction bands, also known as anti-cracks or closing mode structures. We hypothesize that cross-bedding should have a
Cross-bedding related anisotropy and its interplay with various ...
2015年8月1日 · To understand how the cross-bedding associated anisotropy affects the formation and orientation of joints in aeolian Aztec Sandstone, a model based on the generalized Hooke's law for anisotropic materials (Lekhnitskii, 1963) is analyzed assuming that the cross-bedded sandstone is transversely isotropic (Equation (1)).
Cross-bedding - Geology is the Way
Cross-bedding (or cross-stratification) is a primary sedimentary feature characterized by layers that intersect at an angle with each other through planar erosional surfaces that truncate inclined beds and laminae. This structure is the result of the migration of bedforms, such as dunes, ripples, and megaripples, produced by wind or water ...
The Aztec Sandstone is a 1400-meter-thick, cross-bedded aeolian deposit (Marzolf, 1983) and consists of a number of dune units with NW-NNE oriented dune boundaries with moderate dip angles (less than 30°). The dune boundaries can be defined as second order bounding surfaces, which are commonly present in
Cross-bedding set thickness and stratigraphic architecture of aeolian ...
2008年5月1日 · The facies succession characterised by sandstones with adhesion structures followed by wind-rippled sandstones and aeolian dune cross-bedded sandstones define drying-upward cycles. These cycles were related to the progressive filling of interdune depressions, associated with the migration and climbing of aeolian dunes ( Kocurek, 1981 ).
Cross-bedding related anisotropy and its interplay with various ...
2015年8月1日 · Field observations are combined with microscopic analyses to investigate the mechanism of formation of wiggly compaction bands (CBs) in the porous Jurassic aeolian Aztec Sandstone exposed at Valley …
Aeolian sands and sandstones - Durham e-Theses - Durham …
2013年7月16日 · Aeolian cross-bedding generally comprises 2 superimposed orders of nested trough-shaped sets. One is developed by migrating draa, one by migrating dunes. Four orders of bounding surface exist: 2 migration surfaces and 2 modification surfaces. The Yellow Sands of N.E. England represent longitudinal draa.
compaction bands in the aeolian Aztec Sandstone exposed throughout the Valley of Fire State Park, Nevada. Field observations at several locations within the Park show that depositional domains (dune units characterized by cross-beds therein) with particular ranges of cross-bed orientations corresponding to
Cross-bedding set thickness and stratigraphic architecture of aeolian ...
2008年5月1日 · This aeolian desert succession records aeolian dune, dry and damp interdune and aeolian sandsheet sedimentation in streamflow, fluvial channel and overbank settings.