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

See also

• List of fossiliferous stratigraphic units in Illinois

References

• Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Archived from the original on 25 March 2022. Retrieved 22 June 2014.

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