@misc{indiciaee1df1a7822e2,
  title = {Integration of geophysical evidence suggests that anorthosite composes a significant portion of Grand Marais ridge, an inferred basement high in western Lake Superior},
  author = {V. J. Grauch and Samuel J. Heller},
  year = {2021},
  url = {https://pubs.usgs.gov/publication/70222361},
  note = {Source identifier: 70222361}
}