The Freeport Formation is a geologic formation in Pennsylvania and Ohio. It preserves fossils dating back to the Late Pennsylvanian period.^[2] It is within the Allegheny Group.

Key Information

Freeport Formation
Stratigraphic range: Pennsylvanian
Type	Formation
Location
Region	Pennsylvania, Ohio
Country	United States
Type section
Named for	Freeport, Pennsylvania
Named by	H. D. Rogers, 1840[1]
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1. ^ Rogers, H. D., 1840, Fourth annual report of the geological survey of the state of Pennsylvania. Harrisburg, PA, 215 p. ([1])
2. ^ Freeport, National Geologic Map Database, Geolex — Unit Summary.

• Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Archived from the original on 25 March 2022. Retrieved 17 December 2021.

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