Cross-bedding - Wikipedia
In geology, cross-bedding, also known as cross-stratification, is layering within a stratum and at an angle to the main bedding plane. The sedimentary structures which result are roughly horizontal units composed of inclined layers. The original depositional layering is tilted, such tilting not being the result of post-depositional deformation.
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 ...
Crossbedding--reading the rock - Michigan Technological University
Cross-beds are the groups of inclined layers, and the sloping layers are known as cross strata. Cross bedding forms on a sloping surface such as ripple marks and dunes, and allows us to interpret that the depositional environment was water or wind. Examples of these are ripples, dunes, sand waves, hummocks, bars, and deltas. Cross-bedding is ...
Cross-Bedding - University of Oregon
Cross beds form from running water. As the water flows, it creates bedforms, such as ripples or dunes, on the floor of the channel. Sediment deposited on the downcurrent side of these bedforms is deposited at an angle--not horizontally.
Sedimentary Structures - IU
CROSS-BEDDING is a feature that occurs at various scales, and is observed in conglomerates and sandstones. It reflects the transport of gravel and sand by currents that flow over the sediment surface (e.g. in a river channel).
Cross Bedding - University of Pittsburgh
These tilted layers contained within larger layers are termed cross bedding. If you go dig trenches into modern sediments, you will find that cross-beds form a part of ripples and dunes. In fact, they reflect the steep facies down which sediment tumbles during current transport. The first figure below illustrates this process.
Cross-Bedding - an overview | ScienceDirect Topics
Cross-bedding refers to the inclined layers within sedimentary rocks that are deposited at an angle to the horizontal layers. It can be classified into planar cross-bedding, trough cross-bedding, and hummocky cross-bedding based on their shapes and characteristics.
Cross Bedding - SERC
2008年10月27日 · Over time, multiple avalanching episodes will result in many thin parallel layers next to one another. These are called cross bedded laminae, because they form at an angle to the horizontal nature of the main bed. See the graphic below for …
Crossbedding – some common terminology - Geological …
2019年2月10日 · Crossbeds form where air and water flow across a bed of loose sediment, so long as the individual sediment grains are cohesionless (non-sticky). Mud crossbeds are rare because individual clay particles tend to bind to one another (a result of residual electric charges).
cross bed – An Introduction to Geology
A sedimentary structure that forms in the lower flow regime, where ridges of sediment form perpendicular to flow direction, but within the ridges, sediment layers and dips toward flow direction. Found in ripples and dunes. Can be tabular, sinuous, or trough shaped.