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Home > Explore! > Surficial Geology > Field Localities > Big Rock, Waltham > Figure 6




Figure 6. Deblois Granite, in a bedrock exposure in a small gravel pit near the Big Rock parking area. Note rims of light-colored feldspar enclosing slightly darker feldspar. The rock type is similar to that of Big Rock. There is a small xenolith below the penny.


Last updated on November 20, 2012