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Gallatin River

 

Notice the difference in grain sizes related to different energy input. Slower flow allows for deposition of silt sized particles and faster flow only allows gravel sized particles to be left on the stream bed.

Grain Size

Sediment Name

Rock Name

Larger than 2 mm

Gravel

Conglomerate

2 mm to 0.06 mm

Sand

Sandstone

0.06 to 0.002 mm

Silt

Siltstone

Smaller than 0.002 mm

Clay

Shale