Fig. 1. Transformed soil texture tetrahedrons for (A) the USDA and (B) the ISSS systems show relationships of projected planes at 25, 50, and 75% rock with the base plane at 0% rock. The sides of the tetrahedrons are labeled as in Plate 1. The dashed line (c) in (A) is the trajectory that connects the centroids of the clay texture class polygons from 0 to 100% rock

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