@misc{indiciaed36573603d89,
  title = {Radiometric age (Late Ordovician) of the Quincy, Cape Ann, and Peabody Granites from eastern Massachusetts},
  author = {Robert E. Zartman and Richard F. Marvin},
  year = {1971},
  doi = {10.1130/0016-7606(1971)82[937:raloot]2.0.co;2},
  url = {https://pubs.usgs.gov/publication/70227316},
  note = {Source identifier: 70227316}
}