Scales Shale

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

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

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