Figure 1. Changing interpretations of sand and gravel aquifers for a portion of the Northeast Bluff quadrangle in eastern Maine (see Figure 2 for location). Image at left is from the reconnaissance sand and gravel aquifer map published in 1981 (scale 1:50,000). Light gray areas indicate yields of greater than 10 gpm. Dark gray indicates yields of over 50 gpm. Center image is the significant sand and gravel aquifer map published in 1988 (scale 1:50,000). Light gray areas indicate yields of greater than 10 gpm. Image at right is the significant sand and gravel aquifer map published in 2000 (scale 1:24,000). Yellow areas indicate yields of greater than 10 gpm. Red indicates yields of over 50 gpm. Note how the interpretation of high yield areas has changed over time.

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Last updated on October 6, 2005

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