Figure 6. Comparison of the 1967 (left) and 1985 (right) bedrock maps for the Flagstaff Lake area, northwestern Maine. Earlier detail is largely retained on the 1985 map, but additional detail is shown within units shown as "undifferentiated" on the 1967 map (such as OCu, OCp, and DOu). Also, the different use of color emphasizes details of individual units on the 1967 map, in contrast with continuity of large areas of similar age on the 1985 map.

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Last updated on March 7, 2008

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