@misc{indiciae2302f886448a,
  title = {High-precision 40Ar/39Ar age spectrum dating of sanidine from the Middle Pennsylvanian Fire Clay tonstein of the Appalachian basin},
  author = {Michael J. Kunk and Charles L. Rice},
  year = {1994},
  doi = {10.1130/spe294-p105},
  url = {https://pubs.usgs.gov/publication/70207650},
  note = {Source identifier: 70207650}
}