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According to the Udden-Wentworth grain-size scale, boulders range from the class of fine boulders, with a middle axis >0.25 m, to the class of medium blocks, with a middle axis of up to 16.4 m [52].
Wentworth (1922) grain size classification detailed chart 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". And here's a couple of classification schemes for sediment using these terms:
Udden-Wentworth grain-size classification scheme (Wentworth, 1922). Figure F7. Udden-Wentworth grain-size classification scheme (Wentworth, 1922).
Udden-Wentworth Grain Size Scale. The Udden-Wentworth grain size scale is the most common one used by geologists and forms the basis for subdividing clastic sedimentary rocks based on clast size. We tend to make the most basic subdivisions based on size because the maximum clast size is a function of the amount of energy in the system.
According to the Udden-Wentworth grain-size scale, boulders range from the class of fine boulders, with a middle axis >0.25 m, to the class of medium blocks, with a middle axis of up to 16.4 m [52].
1 de ene. de 2014 · Two size classifications are particularly widely used, those of Wentworth (1922) and Krumbein (1934). Both are shown in Figure 1. A derivation of the Udden-Wentworth scale, which merely omits the granules category, was adopted in 1947 by the National Research Council (Lane et al., 1947).
Table 5.5. The Wentworth scale is a scale for classifying and describing sediments by grain size. Table adapted from the Wentworth scale, Wentworth, C.K. (1922). A scale of grade and class terms for clastic sediments. The Journal of Geology, Vol 30(5):377-392. Exploring Our Fluid Earth, a product of the Curriculum Research & Development Group ...
