The Scales Shale is a geologic formation in Illinois. It preserves fossils dating back to the Ordovician period.

Scales Shale
Stratigraphic range: Ordovician
TypeFormation
Unit ofMaquoketa Group
UnderliesFort Atkinson Limestone
OverliesTrenton Limestone
Location
RegionIllinois, Indiana
CountryUnited States

See also

edit

References

edit
  • Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 22 June 2014.