Coastal & Marine Geology InfoBank

Home FACS Activities Atlas Geology School Related Sites More

USGS CMG InfoBank: Sorting of Sediments

Skip navigational links
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: 05:15 - 06:03 (00:48)
Source: Annenberg/CPB Resources - Earth Revealed - 17. Sedimentary Rocks: The Key to Past Environments
Keywords: "Dee Trent", "sedimentary rock", "clastic sediment", deposition, water, river, mountain, canyon, valley, "coarse grained sediment", "fine grained sediment", sandstone, siltstone, ocean, sand, shoreline, mud, clay

Our transcription: Deposition typically occurs wherever there's a slowing of the running water.
A good example would be at the base of a steep mountain range, where the rivers are coming out of a deep canyon into a flat valley.
Now, the kinds of materials that would be formed there would be very coarse grained.
The further away you get from the front of the mountain range, the finer the grained is the sediment being carried.
Like consequently you would get finer grained sandstones or siltstones further away.
The same thing happens in an ocean.
Where a river enters the ocean, the first things that drop out are the course grained materials, generally sand size material.
Further out to sea there will be fine grained material.
Well, the sands are usually found on the coast shoreline areas, where the muds and the clays would be further offshore.

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

Take Pride in America logo logo U.S. Department of the Interior | U.S. Geological Survey
Page Contact Information: InfoBank staff
Page Last Modified: Thu Oct 31 04:27:05 PDT 2013  (chd)