@misc{indiciae44f4d937ddd8,
  title = {Radiometric ages of the Fire Clay tonstein [Pennsylvanian (Upper Carboniferous), Westphalian, Duckmantian]: A comparison of U-Pb zircon single-crystal ages and 40Ar/39Ar sanidine single-crystal plateau ages},
  author = {P.C. Lyons and T.E. Krogh and Y.Y. Kwok and D.W. Davis and W.F. Outerbridge and H. T. Evans},
  year = {2006},
  doi = {10.1016/j.coal.2005.12.002},
  url = {https://pubs.usgs.gov/publication/70028054},
  note = {Source identifier: 70028054}
}