Figure 2c. Portion of the Gray quadrangle, Surficial Materials map series. The materials map shows the data used to construct the surficial geology map. As in Figure 2a, note the number of data points (observation wells and test borings) along the eastern boundary of the aquifer. In contrast, there are only a few points along the western boundary of the aquifer. As a result of the density of information, the eastern boundary can be considered more "accurate" than the western boundary. The western boundary is based on more subjective information such as an interpretation of topography and other surficial geologic indicators. Refer to Figure 2a and Figure 2b for more information on aquifer boundaries.

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Last updated on October 6, 2005

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