Location.—The city of Lewiston is located in the southwestern part of Maine, in Androscoggin County, on the left bank of the Androscoggin. The type locality of the Bates limestone is represented by the City quarry which is located in the southern part of Lewiston, in a low hill known locally as “West Rose Hill.” This quarry is along the Brunswick division of the Maine Central Railroad, about one mile southeast of the Lewiston Lower Station. Another outcrop of the Bates limestone is to be found about one-half mile north of the City quarry, along the same railroad at Cedar Street. The Martin quarry, where the Bates limestone is worked, is about three-quarters of a mile south of the City quarry. In these three locations the Bates limestone shows the same general structural and mineralogical characteristics. Igneous intrusions of varying types occur in all three locations.