USGS CMG InfoBank: Ripple Marks

Dictionaries:	Our Mapping Systems The USGS and Science Education USGS Fact Sheets Topics Keywords Data Dictionary Metadata Dictionary Computer Terminology Digital Formats
InfoBank Terms:	Activity ID activity overview crew digital data formal metadata lines metadata NGDC port stops project/theme region ship stations time virtual globe year
Data Types:	bathymetry biological geochemical gravity ground penetrating radar imaging LIDAR logs magnetics metering equipment navigation samples seismic total station definitions disclaimer
Data Formats:	ARC coverage E00 FGDC metadata gridded/image imaging material scattered/swath Shapefile vector/polygon

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.

Geology School Keywords

Skip footer navigational links

Coastal and Marine Science Centers: Pacific St. Petersburg Woods Hole
InfoBank Coastal and Marine Geology Program Geologic Information Ask-A-Geologist USGS Disclaimer

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 Information: InfoBank staff
Page Last Modified: Tue Feb 5 05:15:33 PST 2013 (chd)