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An Unexplored Realm in the Heartland of the Southern Gulf ... - Famsi

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evenly distributed <strong>in</strong> <strong>the</strong> soil, was used to standardize <strong>the</strong> usable elements and was not<br />

<strong>in</strong>cluded on its own <strong>in</strong> <strong>the</strong> f<strong>in</strong>al analysis. The same procedure was followed <strong>in</strong> Soil<br />

Survey II, but Sr was present <strong>in</strong> sufficient amounts to be considered.<br />

Box plots were constructed to summarize <strong>the</strong> datasets (Figures 4.28a and 4.28b). The<br />

greater <strong>the</strong> standard deviations and ranges, <strong>the</strong> more spatially heterogeneous <strong>the</strong> element<br />

is across <strong>the</strong> survey area. In both Plazas I and II, potassium (K), manganese (Mn), and<br />

phosphorus (P) exhibit <strong>the</strong> characteristics required to produce identifiable contrasts and<br />

patterns. Alternatively, barium (Ba), iron (Fe), magnesium (Mg), sodium (Na), and<br />

strontium (Sr) illustrate a relative homogeneity that suggests that <strong>the</strong>ir levels <strong>of</strong> contrast<br />

are not sufficient to provide <strong>the</strong> dist<strong>in</strong>ctions needed to discern <strong>the</strong>ir depositional<br />

arrangement.<br />

Figure 4.28a. Box plot summaries <strong>of</strong> elemental data from Plaza I<br />

164

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