Large and very striking geological map that focuses on the vicinity around Boston. The region shown is bounded by the counties of Beverly, Wilmington, Dedham, and Hingham, parts of which are included. Large inset shows a larger region, extending further west to include Ashby, Westminster, Princeton and Oxford counties, north to Salisbury County, and south to include Mansfield, Easton, Bridgewater, and Kingston counties. Color legend locates nineteen different geological formations. A comment below the legend states that Shawmut Breccia, Amygdaloid, Primordial Slate and Conglomerate are not distinguished on this small scale map. An uncommon issue that was created by W.O. Crosby. Complete with the original envelope labeled "Occasional Papers of the Boston Society of Natural History - Vol. III Map."

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Condition: B

Folding, as issued. Beautiful impression and coloring. A little toning mostly along one fold, else fine.