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Wentworth (1922) grain size classification

Wentworth (1922) grain size classification

Chester K. Wentworth

Wentworth (1922) grain size classification
The canonical definition of sediment grain sizes as defined by geologist Chester K. Wentworth in a 1922 article in The Journal of Geology: "A Scale of Grade and Class Terms for Clastic Sediments".

For more information about sediment classification, visit the United States Geological Survey website.

Here is a more complex version of the same chart:

And here's a couple of classification schemes for sediment using these terms:

Original image data dated on or about January 1, 1922

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