Changes

==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)]]

[[File:Sandstone_Fig-1.png|center|200px|frame|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 :