Box plots can be very useful when comparing multiple sets of data. They provide a simple summary of dispersion and show means of center as well (average and median). Each box plot separates its data into percentiles, usually noting 25th, 50th (center), and 75th quartiles as the three horizontal lines making up the box. These box plots are representations of geologic types at differing elevations. Each type of rock (and a mixture of a couple of types) has its own box plot. From this study, one can see that the 50th percentile of metamorphic rocks occurred just above 1600 ft, while the 50th AND 75th percentile of sand occurred just below 1200 ft.
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