Search results
Results from the WOW.Com Content Network
Current ripple marks, unidirectional ripples, or asymmetrical ripple marks are asymmetrical in profile, with a gentle up-current slope and a steeper down-current slope. The down-current slope is the angle of repose, which depends on the shape of the sediment.
This creates ripple marks with pointed crests and rounded troughs, which aren't inclined more to a certain direction. Three common sedimentary structures that are created by these processes are herringbone cross-stratification, flaser bedding, and interference ripples. Asymmetrical ripple marks These are created by a one way current, for ...
Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Pages for logged out editors learn more
A multisided record is a type of vinyl record that has more than one groove per side. This technique allows hidden tracks to be encoded on LPs, 45 rpms and 78 rpms. On a disc that has a multi-groove, whether the listener plays the main track or the hidden track depends on where the stylus is cued.
Two different ways of marking cut-out records on LP jackets. When LPs were the primary medium for the commercial distribution of sound recordings, manufacturers would cut the corner, punch a hole, or add a notch to the spine of the jacket of unsold records returned from retailers; these "cut-outs" might then be re-sold to record retailers or other sales outlets for sale at a discounted price.
In sedimentology, wave-formed ripples or wave-formed ripple marks are a feature of sediments (sandstones, limestones, siltstones) and dunes. These ripple marks are often characterised (and thus distinguished from current ripples ) by symmetric cross sections and long relatively straight crests, which may commonly bifurcate.
Classic, low-density turbidites are characterized by graded bedding, current ripple marks, climbing ripple laminations, alternating sequences with pelagic sediments, distinct fauna changes between the turbidite and native pelagic sediments, sole markings, thick sediment sequences, regular bedding, and an absence of shallow-water features. [3]
Ripple marks: High: Small, cm-scale undulations Sand waves: Medium to low: Rare, longer wavelength than ripples Dunes/Megaripples: High: Large, meter-scale ripples Upper: Upper plane bed: High: Flat laminae, +/- aligned grains (parting lineations) Antidunes: Low: Water in phase with bedform, low angle, subtle laminae Pool and chute: Very low ...