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→Udden-Wentworth Grain Scale
==Udden-Wentworth Grain Scale==
==Udden-Wentworth Grain Scale==
[[File:Sandstone_Fig-3.png|center|300px|Fig 1. Udden-Wentworth Grain Scale (Sand scale) (Derived from Nichols, 2009)]]
Sand grain size has a wide range of scale, from very coarse sand until very find sand. For the grain size measurement, its use a formula proposed by Krumbein in 1934, is based on the following relationship :
Sand grain size has a wide range of scale, from very coarse sand until very find sand. For the grain size measurement, its use a formula proposed by Krumbein in 1934, is based on the following relationship :
:Ф = -log2 d
:Ф = -log2 d