Workers find signs of 7,500-year-old civilization while building water plant The Associated Press NORWELL, Mass. -- The discovery of a possible American Indian settlement as much as 7,500 years old has halted work on a new water treatment plant. Workers have found about 38 tools and stone chips used for making and repairing tools, as well as a hearth and a storage pit, at the site on South Street near Third Herring Brook. Lauren J. Cook, senior archaeologist on the team that surveyed the area, said it was unusual to find "features" of civilizations, like the hearth and the stone...