Coastal & Marine Geology InfoBank

USGS CMG InfoBank: Ripple Marks


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Comment: 16:08 - 16:36 (00:28)

Source: Annenberg/CPB Resources - Earth Revealed - 17. Sedimentary Rocks: The Key to Past Environments

Keywords: "sedimentary rock", "clastic sediment", "sedimentary structure", "ripple mark", sand, "shallow water", wave, current

Our transcription: Another common sedimentary structure, "ripple marks", often develops in soft beds of sand lying in shallow water.

The to-and-fro motion of waves creates symmetrical ripples.

When they're sculpted by the one-way motion of currents, they are asymmetric with their steeper sides facing in the down-current direction.

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Accessibility FOIA Privacy Policies and Notices
U.S. Department of the Interior \| U.S. Geological Survey URL: http://walrus.wr.usgs.gov/infobank/programs/html/school/moviepage/16.01.19.html Page Contact: InfoBank staff Page Last Modified: Tue Dec 16 06:31:40 PST 2008 (wcs)