Figure 1. PERCENTAGE ESTIMATION CHART. The following diagrams represent approximate percentages occupied by a dark mineral grain in the total area of the circle. The top row in each block represents fine-grained particles while the bottom row represents coarse-grained particles. (Source: J. R. Carpenter (ed.), 1987, Earth Science Source Book: Center for Science Education, University of South Carolina, Columbia, South Carolina.)

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Last updated on October 6, 2005

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