1. Read W.F. (1985). Impact bombs in Middle Ordovician marine sediments of southeastern Wisconsin . Lunar and Planet. Sci. Vol: 16th: Abstr. Pap. 16th Conf., March 11-15, 1985. Pt 2, Houston, Tex., P. 687-688
  2. Read William F. (1987). At least three bubble-bearing layers of impact spherules in the ordovician of Wisconsin. Meteoritics , Vol.22, No.4, P. 487
  3. see
  4. French Bevan M., Cordua William S., Plescia J.B. (2004). The Rock Elm meteorite impact structure, Wisconsin: geology and shock-metamorphic effects in quartz. Geol. Soc. Amer. Bull., Vol.116, No.1, P. 200-218
  5. Jarmo Moilanen (2004). References.
  6. Osinski Gordon R. (2006). The geological record of meteorite impacts. 40th ESLAB First International Conference on Impact Cratering in the Solar System, 8-12 May 2006., Noordwijk,The Netherlands


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