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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.
As the sediment that was carried and deposited further from the glacial ice settles out, the sediment will form climbing ripples. The ripples move downstream over time, and as more sediment settles out on top of the preexisting ripples, it causes the bed to appear to climb. Climbing ripples often occur in finer grained sediments. [8] This ...
The Hanson Formation (also known as the Shafer Peak Formation) is a geologic formation on Mount Kirkpatrick and north Victoria Land, Ross Dependency, Antarctica.It is one of the two major dinosaur-bearing rock groups found on Antarctica to date; the other is the Snow Hill Island Formation and related formations from the Late Cretaceous of the Antarctic Peninsula.
As grains settle out, current ripples develop, with climbing ripples developing if sedimentation rates are high enough. If shear is imposed on the ripple beds by an earthquake and/or by an overlying turbidite/turbidity current, the ripple laminations can be deformed into convolute laminations and flame structures.
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]
Clausing said the ripple effects are harder to calculate. As the US slaps tariffs on importers, domestic manufacturers may use that opportunity to raise their own prices, bringing the base level ...
Lockatong deltas produced sandstone beds with climbing ripple cross-bedding, a specialized sedimentary structure indicative of decelerating water. Some deltaic sandstone bedding is similar to the foreset beds of wave-dominated sandstone. However, the layers are more bowl-shaped and clinoform (i.e. stacked at much steeper angles).
Lou Smit, a detective who worked in Colorado Springs law enforcement for decades, came out of retirement at the request of Boulder authorities after the 1996 murder of JonBenet Ramsey (Cindy Marra)