@misc{indiciaed69db87cdc59,
  title = {The Spruce Head composite pluton: An example of mafic to silicic Salinian magmatism in coastal Maine, northern Appalachians},
  author = {Robert A. Ayuso and Joseph G. Arth},
  year = {1997},
  doi = {10.1130/0-8137-1191-6.19},
  url = {https://pubs.usgs.gov/publication/70246538},
  note = {Source identifier: 70246538}
}