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==Udden-Wentworth Grain Scale==
 
==Udden-Wentworth Grain Scale==
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[[File:Sandstone_Fig-1.png|center|200px|frame|Fig 1. Udden-Wentworth Grain Scale (Sand scale) (Derived from Nichols, 2009)]]
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[[File:Sandstone_Fig-1.png|center|100px|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 :

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