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EARTH SCIENCE

Platte Canyon High School
Bailey, Colorado

Useful Info

USEFUL INFORMATION
Sediment Grain Size Scale

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Phi Descriptive mm
-8 to -12
-4 to -8
-1 to -4
4 to -1
8 to 4
14 to 8
Boulder
Cobble
Pebble
Sand
Silt
Clay
256 +
64 - 256
2 - 64
1/16 - 2
1/256 - 1/16
< 1/256
phi = -log2S
S = size in mm
   
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