Sedimentary Petrology 02: Grain size parameters.

This video lecture series on Sedimentary Petrology (Undergraduate course GY 402) was made by Dr. Douglas W. Haywick from the Department of Earth Sciences at University of South Alabama.

Grain size schemes

There are several schemes for grain sizes:

  • US Army Corp of Engineers (mesh size)
  • Soil scientists
  • Academic geologists (metric)

Udden-Wentworth grain size

  • Gravel: >2.00mm
  • Sand: 0.063mm - 2.00mm
  • Silt: 0.004mm - 0.063mm
  • Clay: <0.004mm

See also