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Plymouth (Town and county-seat rocks)

a town and county-seat rocks, or in some cases, perhaps, of the ocean. They have been melted, and of Plymouth co., Mass.; on Plymouth Bay, and on the New York, New Haven, cooled very slowly so as to permit them to crystallize. Under the plutonic rocks are comprehended granites, syenites, and some porphyries, diorite, tonalite, and gabbro. They belong to all the leading geological periods, even the Tertiary.