The major portion of Bristol County shows sedimentary rocks consisting chiefly of the Rhode Island formation of shales, conglomerates and sandstones. B. K. Emerson2 has mapped the peninsular portion of Bristol Neck as granodiorite. The low cliffs bordering the Taunton River are made up of a coarse grained to porphyritic pink orthoclase granite cut by numerous quartz stringers and pegmatitic granite. The low cliffs of the Mt. Hope Bay region are mainly agatized quartz similar to the Diamond Hill area of Providence County.

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