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Line 8:
Line 8: − Fig 1. Udden-Wentworth Grain Scale (Sand scale) − (Derived from Nichols, 2009)
→Udden-Wentworth Grain Scale
:<math>\phi = -\log 2d</math>
:<math>\phi = -\log 2d</math>
Where Ф (phi) size and d is the grain diameter in milimeters. For example, a grain 4 mm in diameter has a phi size of -2, which is the power required to raise the base (2) of the logarithm to 4 (i.e. 22)
Where Ф (phi) size and d is the grain diameter in milimeters. For example, a grain 4 mm in diameter has a phi size of -2, which is the power required to raise the base (2) of the logarithm to 4 (i.e. 22)
==Characterisics Of Major Classes Sandstones==
==Characterisics Of Major Classes Sandstones==