bottom sample grain size

On the top of the chart is a ruler measuring 0-100 millimeters. 0-4 mm is classified as "granules," 4-8 mm as "small pebbles," 8-16 mm as "medium pebbles," 16-32 mm as "large pebbles," 32-64 mm as "very large pebbles," and 64-100 mm as "small cobbles." An inset box notes that 128-256 mm is classified as "large cobbles" and anything larger than 256 mm are "boulders." In the lower part of the chart, there are nine boxes with photos of grains of different sizes, topped by a scale ranging from 0-2000 micrometers. At the low end of the range, 0-125 micrometers is classified as "very fine sand," 125-250 micrometers as "fine sand," 250-500 micrometers as "coarse sand," 1000-2000 micrometers as "very coarse sand." and inset box notes that 3.9-62 micrometers is classified as "silt."

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