In general, sand grains should be cleaned of surface debris by ultrasonoration before the individual grain surface texture is studied. The composition of the surface debris on sand grains from different localities is different and therefore may be of marker value to the geologist and also of interest in reservoir studies. The surface texture of grains of a consolidated sand in the Winchell Formation [Texas] of Pennsylvanian age is more complex than the surface texture of several examples of unconsolidated sands. They are classified into 5 textural groups: 1) abraded 2) lobate, 3)corroded, 4) smooth, and 5) faceted in order of diminishing frequency of occurrence. Each textural group is shown to have a definite relation to grain size.

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