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Home > Explore! > Surficial Geology > Field Localities > Big Rock, Waltham > Figure 5 > Figure 5A
Figure 5A. Dark gray, fine-grained enclave approximately 1 foot by 2 feet within the granite of Big Rock. The upper edge of the enclave is very irregular, due to interaction of the two types of magma before they had completely solidified.
Last updated on November 20, 2012
