The mineral deposit at Bolton, known by collectors and in mineralogic literature for nearly a century, is still worthy of a visit although fresh exposures of the rocks have not been made for many years. The locality is an abandoned limestone quarry situated a few hundred yards from the road between Stow and Lancaster, in the town of Bolton, about 25 miles west and slightly north of Cambridge. The present owner of the farm on which the quarry is located is S. B. Mentzger whose farm is on the roadside, about one mile east of the junction of the road from Hudson, the nearest railroad station, three miles southeast.

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